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I am new here ...I am already preparing for my fmge exam ...and did some systems of combined medicine subjects like anat physio patho pharma then medicine ...currently doing endocrine ...I need your to help me with concepts and clincial mcqs with the new fmge pattern

Welcome! Great to have you here, and solid approach combining systems across subjects before moving to clinical work.

A few quick questions to make sure I help you the right way:

Asking for Preferences

Where exactly are you in Endocrine right now? · What do you need right now? · Which FMGE pattern are you targeting?

Perfect. Let's build this properly.

Here's the plan for your Endocrine module starting with Thyroid:

How We'll Work Together

Session structure:

Core concept - clean, exam-focused explanation (what FMGE actually tests)
High-yield points - the stuff that shows up repeatedly
MCQs - mix of standard SBA + NBE clinical vignette style
Discussion - I'll explain the logic behind each answer

Thyroid - What FMGE Tests (Overview)

Before we dive in, here's the thyroid roadmap so you know what's coming:

Topic	FMGE Weight
Thyroid hormones - synthesis, regulation	High
Hypothyroidism (primary vs secondary)	Very High
Hyperthyroidism / Graves' disease	Very High
Thyroid function tests (TFTs) interpretation	Very High
Thyroiditis (Hashimoto's, De Quervain's, Riedel's)	High
Thyroid nodule / carcinoma	High
Thyroid in pregnancy	High
Drugs (PTU, carbimazole, levothyroxine)	High

Where Do You Want to Start?

I'd suggest starting with Thyroid Hormone Synthesis & Regulation (the foundation everything else builds on), then moving to TFT interpretation (highest-yield for MCQs), then the clinical conditions.

Just say:

"Go" - and I'll start with synthesis & regulation
Or name a specific topic (e.g., "Graves disease", "TFTs", "thyroid in pregnancy") if you want to jump straight there

What's it going to be?

I'll get back to you

Sure, take your time! Whenever you're ready, just drop a message and we'll pick up right where we left off. Good luck with your prep! 👍

Get me 75 clinical cases mcq questions and some one lines on basica of pituitary gland gh prolactin hypopituitarism adh ..and I'll answer them exactly new fmge style and pattern and question styles

Reading File

Finding Sources

Reading File

I have all the content I need. Let me now build your full material.---

PITUITARY GLAND - FMGE MASTER REVISION

PART 1 - HIGH-YIELD ONE-LINERS

PITUITARY BASICS

Pituitary sits in the sella turcica of the sphenoid bone, connected to hypothalamus by the pituitary stalk
Anterior pituitary (adenohypophysis) - derived from Rathke's pouch (ectoderm); secretes GH, TSH, ACTH, FSH, LH, Prolactin
Posterior pituitary (neurohypophysis) - derived from neural ectoderm; stores and releases ADH and Oxytocin (made in hypothalamus)
Most common pituitary tumor overall = non-functioning pituitary adenoma
Most common functioning pituitary tumor = prolactinoma
Bitemporal hemianopia = compression of optic chiasm by pituitary macroadenoma
Pituitary incidentaloma: microadenoma <10mm, macroadenoma >/=10mm

GROWTH HORMONE (GH)

GH secreted by somatotrophs (most abundant cells in anterior pituitary)
Regulated by: GHRH (stimulates) and Somatostatin/SRIF (inhibits) from hypothalamus
GH is a counter-regulatory hormone - raises blood glucose (anti-insulin)
GH acts via IGF-1 (Somatomedin C) synthesized mainly in the liver
Best screening test for GH excess = IGF-1 level (reflects integrated GH secretion)
Gold standard confirmatory test for acromegaly = Oral Glucose Tolerance Test (OGTT) - GH fails to suppress below 1 ng/mL (or 0.4 ng/mL with newer assays)
Diagnosis of GH deficiency = Insulin tolerance test (ITT) or glucagon stimulation test (GH should rise >3-5 ng/mL)
GH peaks during slow wave (deep) sleep and with exercise, stress, hypoglycemia
Gigantism = GH excess before fusion of epiphyses (open growth plates)
Acromegaly = GH excess after fusion of epiphyses
Acromegaly: diagnostic delay of 5-10 years is classic
Acromegaly features: prognathism, macroglossia, shoe/ring/hat size increase, hyperhidrosis, carpal tunnel syndrome, sleep apnea, colon polyps, hypertension, DM
Most common cause of acromegaly = GH-secreting pituitary adenoma (>95%)
Ectopic acromegaly = bronchial carcinoid (GHRH secreting) - rarest
Treatment of acromegaly: 1st line = transsphenoidal surgery; medical = somatostatin analogues (octreotide, lanreotide); also cabergoline, pegvisomant (GH receptor antagonist)
Pegvisomant: blocks GH receptor, normalizes IGF-1 but GH levels rise (not used to monitor)
MEN1 association: pituitary adenomas (GH/prolactin), parathyroid, pancreatic tumors

PROLACTIN

Secreted by lactotrophs; primarily under tonic inhibition by dopamine (via D2 receptors)
"Inhibiting the inhibitor" = blocking dopamine -> prolactin rises
Stimulators: TRH, VIP, estrogen, suckling, stress, sleep
Normal prolactin: women <25 ng/mL, men <20 ng/mL; in pregnancy up to 200-500 ng/mL
Drugs causing hyperprolactinemia: metoclopramide, domperidone, haloperidol, risperidone, paliperidone, clomipramine, morphine, OCP
Antipsychotics causing LEAST hyperprolactinemia = clozapine, quetiapine
Hypothyroidism causes hyperprolactinemia via increased TRH
Stalk effect (disconnection hyperprolactinemia): prolactin usually <100-150 ng/mL
Prolactinoma prolactin levels: microprolactinoma 20-250, macroprolactinoma 200->10,000 ng/mL
"Hook effect" (prozone effect) = falsely low prolactin in massive macroprolactinoma; dilute sample to get true value
Clinical features of hyperprolactinemia: galactorrhea, amenorrhea, infertility (females); erectile dysfunction, loss of libido, gynecomastia (males)
Treatment of prolactinoma: 1st line = dopamine agonists (cabergoline > bromocriptine)
Cabergoline preferred over bromocriptine: better tolerated, twice-weekly dosing, more effective
Surgery (transsphenoidal) for prolactinoma: used if DA-resistant or intolerant, or emergency (apoplexy)
Prolactinoma in pregnancy: can enlarge due to estrogen stimulation; monitor symptoms
Physiological causes of galactorrhea: pregnancy, post-partum, suckling

HYPOPITUITARISM

Deficiency of one or more anterior pituitary hormones
Order of hormone loss in progressive hypopituitarism: GH > FSH/LH > TSH > ACTH > Prolactin (GH lost first)
Most common cause overall = pituitary adenoma (direct or post-surgical)
Sheehan syndrome = postpartum pituitary necrosis due to hypovolemic shock/infarction during delivery
- First sign = failure to lactate (prolactin deficiency)
- Classic: amenorrhea, loss of pubic/axillary hair, hypothyroidism, adrenal insufficiency after delivery
Pituitary apoplexy = sudden hemorrhage/infarction into pituitary adenoma; presents with severe headache, visual disturbance, ophthalmoplegia, hypopituitarism; emergency
Empty sella syndrome: CSF herniates into sella, compresses pituitary; most are asymptomatic; associated with obese multiparous women, pseudotumor cerebri
Kallmann syndrome = hypogonadotropic hypogonadism + anosmia (failure of GnRH neurons to migrate)
Craniopharyngioma: most common suprasellar tumor in children; Rathke's pouch remnant; calcification on imaging; presents with hypopituitarism, bitemporal hemianopia, diabetes insipidus
Treatment of hypopituitarism: replace deficient hormones; cortisol must be replaced before thyroxine (otherwise can precipitate adrenal crisis)

ADH (VASOPRESSIN) AND DIABETES INSIPIDUS

ADH (vasopressin) made in supraoptic nucleus (primarily) and paraventricular nucleus of hypothalamus; stored and released from posterior pituitary
ADH acts on V2 receptors in renal collecting duct -> inserts aquaporin-2 channels -> water reabsorption
V1 receptors: vascular smooth muscle (vasoconstriction)
Stimuli for ADH release: increased plasma osmolality (most potent), hypovolemia, hypotension, pain, nausea
Osmoreceptors in anterior hypothalamus detect osmolality changes
Normal plasma osmolality: 275-295 mOsm/kg; ADH released when osmolality >290
Diabetes insipidus (DI): hallmark = polyuria (>3L/day) + dilute urine (osmolality <300, specific gravity <1.005)
Central DI = ADH deficiency; causes: neurosurgery, head trauma, tumors (craniopharyngioma), infections, Langerhans cell histiocytosis, autoimmune, idiopathic
Nephrogenic DI = ADH resistance; causes: lithium (most common drug), demeclocycline, hypercalcemia, hypokalemia, inherited (X-linked, aquaporin-2 mutation)
Dipsogenic (primary polydipsia) = excessive water intake; urine osmolality can concentrate normally
Water deprivation test: central DI -> urine does not concentrate; after desmopressin (DDAVP) -> urine concentrates (>50% rise) = CENTRAL
Nephrogenic DI: no/minimal response to DDAVP
Treatment: Central DI = desmopressin (DDAVP)
Treatment: Nephrogenic DI = thiazide diuretics + low-salt/low-protein diet; amiloride (for lithium-induced); NSAIDs
Hypernatremia in DI: only if patient cannot access water (confused, elderly, infant)

SIADH (Syndrome of Inappropriate ADH)

Excessive ADH despite low osmolality -> water retention -> dilutional hyponatremia
Key: urine is inappropriately concentrated (urine osmolality >100; usually >300)
Features: euvolemic hyponatremia, urine Na >20, low serum osmolality
Causes: CNS (meningitis, stroke, SAH), pulmonary (TB, pneumonia, SARS), drugs (carbamazepine, SSRIs, oxytocin, cyclophosphamide, vincristine, chlorpropamide), SCLC (ectopic ADH), hypothyroidism, Addison's
Treatment: fluid restriction (1st line); hypertonic saline (3%) only for severe symptomatic hyponatremia; tolvaptan/conivaptan (V2 receptor antagonists - vaptans) for chronic SIADH
Do NOT correct Na too fast: risk of osmotic demyelination syndrome (ODS/CPM) - max 8-10 mEq/L per 24 hours
Demeclocycline: induces nephrogenic DI -> used to treat chronic SIADH (second line)

PART 2 - 75 CLINICAL MCQs (NEW FMGE PATTERN)

Instructions: Answer each question, then I'll reveal answers + explanations in batches. Questions are clinical vignette style (NBE new pattern) + some single best answer pattern.

BLOCK A - GROWTH HORMONE (Q1-Q18)

Q1. A 42-year-old man presents with progressively increasing shoe size over the past 8 years, prominent jaw, widened spacing between teeth, and excessive sweating. His wife says he has started snoring loudly. On examination, BP is 148/94 mmHg. Random GH level is 12 ng/mL. Which ONE test will CONFIRM the diagnosis?

A) Serum IGF-1 level
B) MRI pituitary
C) 75g OGTT with serial GH levels
D) 24-hour urinary GH

Q2. A 38-year-old woman with acromegaly undergoes biochemical evaluation. Her IGF-1 is elevated. During OGTT, GH nadir is 1.8 ng/mL. MRI shows a 14mm pituitary adenoma. What is the MOST appropriate first-line management?

A) Octreotide LAR injection
B) Cabergoline oral
C) Transsphenoidal surgery
D) Radiotherapy

Q3. A 16-year-old boy is referred for tall stature (height 198cm, >3 SD for age). His father is 175cm, mother 162cm. He has coarse facial features, large hands, and sweating. IGF-1 is significantly elevated. What is the term for this condition and what is the MOST likely underlying cause?

A) Gigantism; GHRH-secreting bronchial carcinoid
B) Gigantism; GH-secreting pituitary adenoma
C) Acromegaly; GH-secreting pituitary adenoma
D) Constitutional tall stature; familial variant

Q4. A patient with acromegaly is treated with transsphenoidal surgery. Post-operatively, the surgeon asks for a test of remission. Which finding indicates SURGICAL CURE?

A) GH < 5 ng/mL on random sample
B) GH suppression to < 1 ng/mL (or <0.4 ng/mL) after 75g OGTT + normal IGF-1
C) Normal MRI pituitary
D) Prolactin returning to normal

Q5. A 45-year-old man with known acromegaly is on octreotide but IGF-1 remains elevated. He refuses surgery. A new drug is added that blocks the GH receptor peripherally. Which drug is this, and what is the expected effect on GH levels?

A) Cabergoline; GH levels fall
B) Pegvisomant; GH levels rise
C) Lanreotide; GH levels fall
D) Bromocriptine; GH levels fall

Q6. A 35-year-old woman with acromegaly is found to have hypertension, impaired fasting glucose, colon polyps on colonoscopy, and bilateral carpal tunnel syndrome. Which complication of acromegaly carries the HIGHEST risk of mortality?

A) Colon cancer
B) Carpal tunnel syndrome
C) Cardiovascular disease (cardiomyopathy, hypertension)
D) Diabetes mellitus

Q7. Which of the following is a PHYSIOLOGICAL stimulus for GH secretion?

A) Hyperglycemia
B) Free fatty acid excess
C) Slow wave (deep) sleep
D) Obesity

Q8. A 50-year-old man with a pituitary macroadenoma is found to have low GH with poor response to glucagon stimulation test. He complains of fatigue, reduced exercise capacity, central obesity, and low quality of life. Which is the BEST investigation to diagnose GH deficiency in adults?

A) Random serum GH level
B) IGF-1 alone
C) Insulin tolerance test (ITT)
D) 24-hour urine GH

Q9. A patient with acromegaly develops bitemporal hemianopia. The pituitary adenoma is MOST likely compressing which structure?

A) Optic nerve (CN II)
B) Optic chiasm
C) Optic tract
D) Lateral geniculate body

Q10. A 28-year-old male presents with tall stature (200cm), large hands and feet, delayed puberty, and open epiphyses on X-ray at age 22. Serum IGF-1 is markedly elevated. What is the MOST likely additional finding on investigation?

A) Low testosterone
B) Normal bone age
C) Suppressed FSH/LH
D) All of the above can coexist

Q11. A 40-year-old woman with acromegaly also has a family history of renal stones, peptic ulcer disease, and a pancreatic neuroendocrine tumor. Which syndrome should be considered?

A) MEN type 2A
B) MEN type 1
C) MEN type 2B
D) Carney complex

Q12. A patient with acromegaly has a GH-secreting pituitary adenoma. Pathophysiology involves which of the following mutations MOST commonly?

A) RET proto-oncogene mutation
B) Gs-alpha subunit activating mutation (GNAS)
C) BRCA1 mutation
D) APC gene mutation

Q13. Which drug used in acromegaly acts as a GH receptor antagonist (not a somatostatin analogue)?

A) Octreotide
B) Lanreotide
C) Pegvisomant
D) Bromocriptine

Q14. A 10-year-old child presents with headache, visual disturbance, a suprasellar calcified mass on CT, and GH deficiency. What is the MOST likely diagnosis?

A) Germinoma
B) Craniopharyngioma
C) Optic glioma
D) Meningioma

Q15. Ectopic acromegaly (GHRH-secreting tumor) is MOST commonly associated with which tumor?

A) Small cell lung cancer
B) Bronchial carcinoid tumor
C) Pheochromocytoma
D) Medullary thyroid carcinoma

Q16. A 44-year-old woman with acromegaly complains of bilateral hand tingling and weakness, worse at night. Tinel's and Phalen's signs are positive. What is the mechanism of this complication?

A) Peripheral neuropathy from diabetes
B) Nerve entrapment due to soft tissue and bony overgrowth (carpal tunnel syndrome)
C) Syringomyelia
D) Radiculopathy from vertebral enlargement

Q17. A patient on long-term octreotide for acromegaly develops right upper quadrant pain and elevated ALP. What is the MOST likely complication?

A) Hepatitis
B) Gallstones (cholelithiasis)
C) Pancreatitis
D) Cholangitis

Q18. In a child with gigantism, growth plates are still open. If GH excess is not treated, what is the expected final height outcome, and what is the primary target of treatment?

A) Final height will be average; no urgency to treat
B) Progressive tall stature; target is normalization of IGF-1 and GH suppression
C) Treatment aims only at GH levels, not IGF-1
D) Radiotherapy is first line in children

BLOCK B - PROLACTIN (Q19-Q37)

Q19. A 27-year-old woman presents with 6 months of amenorrhea, milky nipple discharge, and infertility. Serum prolactin is 320 ng/mL. MRI shows a 12mm pituitary adenoma. What is this adenoma called, and what is the FIRST-LINE treatment?

A) Corticotroph adenoma; hydrocortisone
B) Macroprolactinoma; cabergoline
C) Macroprolactinoma; transsphenoidal surgery
D) Microprolactinoma; bromocriptine

Q20. A 35-year-old male on risperidone for schizophrenia complains of gynecomastia and decreased libido. Prolactin is 65 ng/mL. MRI pituitary is normal. What is the MECHANISM of hyperprolactinemia here?

A) Stimulation of lactotrophs by VIP
B) D2 receptor blockade preventing dopamine inhibition of prolactin
C) Estrogen-mediated lactotroph proliferation
D) TRH-mediated stimulation

Q21. A 32-year-old woman presents with galactorrhea and amenorrhea. TSH is elevated at 12 mIU/L, free T4 is low. Prolactin is 85 ng/mL. MRI pituitary is normal. What is the MOST likely cause of hyperprolactinemia?

A) Prolactinoma
B) Hypothyroidism (elevated TRH stimulating lactotrophs)
C) Drug-induced
D) Stress-related

Q22. A 29-year-old woman with a macroprolactinoma (prolactin 2,800 ng/mL) undergoes MRI. Surprisingly, prolactin comes back as 95 ng/mL on a standard assay. What phenomenon explains this discrepancy?

A) Macroprolactin (big-big prolactin)
B) Hook effect (prozone phenomenon)
C) Laboratory error
D) Partial treatment effect

Q23. Which antipsychotic is LEAST likely to cause hyperprolactinemia?

A) Haloperidol
B) Risperidone
C) Quetiapine
D) Paliperidone

Q24. A 24-year-old woman with microprolactinoma (prolactin 110 ng/mL, tumor 7mm) wants to conceive. She is started on cabergoline. After 2 years, MRI shows no visible adenoma and prolactin is normal. She asks if she can stop the drug and try for pregnancy. What is the BEST advice?

A) She must take cabergoline lifelong
B) Cabergoline can be withdrawn; she can try for natural conception; monitor prolactin
C) She requires surgery before pregnancy
D) Bromocriptine must replace cabergoline before stopping

Q25. Which drug can be used in a patient with hyperprolactinemia who wants to become pregnant - and is PREFERRED during pregnancy itself?

A) Cabergoline (most evidence, but technically category B)
B) Bromocriptine (longest safety data in pregnancy)
C) Both are equally preferred
D) Quinagolide

Q26. A 38-year-old woman presents with headache, sudden visual loss, and vomiting. She was previously diagnosed with a macroprolactinoma. CT scan shows hemorrhage into the pituitary gland. What is this emergency called?

A) Subarachnoid hemorrhage
B) Pituitary apoplexy
C) Hypertensive crisis
D) Cavernous sinus thrombosis

Q27. A 30-year-old woman presents with milky discharge from both breasts. She is not pregnant, not breastfeeding. Prolactin is 28 ng/mL (slightly elevated). She is taking metoclopramide for chronic nausea. What is the FIRST step in management?

A) MRI pituitary immediately
B) Start cabergoline
C) Discontinue metoclopramide and recheck prolactin after 3 days
D) Refer for surgery

Q28. A patient with prolactinoma is on cabergoline. After 6 months, prolactin is normal but MRI shows the tumor has not changed in size. What does this suggest about management?

A) Surgery is mandatory
B) Continue cabergoline - size reduction may take 12-24 months
C) Switch to bromocriptine
D) Add radiotherapy

Q29. Dopamine agonists in prolactinoma are effective primarily because:

A) They suppress TSH, which reduces prolactin
B) They directly bind D2 receptors on lactotrophs, reducing prolactin synthesis and secretion AND causing tumor shrinkage
C) They block estrogen receptors on the tumor
D) They stimulate somatostatin release

Q30. A male patient has a macroprolactinoma causing visual field defects (bitemporal hemianopia). He is started on cabergoline. After 2 weeks, his vision improves dramatically. What explains this rapid visual improvement?

A) Surgical decompression
B) Tumor shrinkage from dopamine agonist therapy
C) Spontaneous tumor infarction
D) Corticosteroid effect

Q31. Which physiological condition produces the HIGHEST prolactin levels?

A) Stress
B) Exercise
C) Pregnancy (up to 200-500 ng/mL)
D) Sleep

Q32. A woman with a microprolactinoma becomes pregnant. What is the expected behavior of the tumor?

A) All microprolactinomas significantly enlarge during pregnancy
B) Microprolactinomas rarely (2-5%) enlarge symptomatically in pregnancy
C) Macroprolactinomas never enlarge in pregnancy
D) Cabergoline must always be continued throughout pregnancy

Q33. Which of the following drugs causes hyperprolactinemia by an UNKNOWN mechanism (not dopamine blockade)?

A) Haloperidol
B) Metoclopramide
C) Clomipramine (tricyclic antidepressant)
D) Domperidone

Q34. Prolactin receptor signaling involves which intracellular kinase?

A) Tyrosine kinase (receptor itself)
B) JAK2 (Janus kinase 2)
C) PKA (protein kinase A)
D) MAPK only

Q35. A 45-year-old male is on methadone maintenance therapy. He reports loss of libido and erectile dysfunction. Prolactin is 55 ng/mL. Testosterone is low. What is the mechanism?

A) Direct testicular toxicity of methadone
B) Opioid mu-receptor activation -> indirect dopamine suppression -> hyperprolactinemia + hypogonadism
C) Pituitary adenoma induced by opioids
D) Estrogen excess from liver disease

Q36. A 33-year-old woman with a prolactinoma is resistant to cabergoline (prolactin remains >500 even on maximum dose). Imaging shows chiasmal compression. What is the NEXT best step?

A) Add octreotide
B) Transsphenoidal surgery
C) Radiotherapy alone
D) Increase cabergoline dose further

Q37. Which of the following is a TRUE statement about galactorrhea?

A) It only occurs with prolactin >200 ng/mL
B) It can occur with normal prolactin levels (e.g., increased breast sensitivity)
C) It always indicates a pituitary adenoma
D) It cannot occur in males

BLOCK C - HYPOPITUITARISM (Q38-Q52)

Q38. A 30-year-old woman delivered her third child. She had massive postpartum hemorrhage requiring 6 units of blood. Now, 6 weeks later, she cannot breastfeed (no milk), has amenorrhea, loss of axillary and pubic hair, and profound fatigue. TSH and ACTH are both low. What is the diagnosis?

A) Primary hypothyroidism
B) Sheehan syndrome (postpartum pituitary necrosis)
C) Postpartum depression
D) Autoimmune hypophysitis

Q39. In a patient with progressive pituitary destruction, which hormone is LOST FIRST?

A) ACTH
B) TSH
C) GH
D) FSH/LH

Q40. A patient with hypopituitarism needs both cortisol and thyroxine replacement. In what ORDER should they be replaced?

A) Thyroxine first, then cortisol
B) Cortisol first, then thyroxine
C) Both simultaneously
D) Order does not matter

Q41. A 22-year-old male presents with absence of puberty (no beard, no voice change, small testes), anosmia since childhood, and low FSH/LH with low testosterone. MRI pituitary is normal. What is the diagnosis?

A) Primary hypogonadism (Klinefelter syndrome)
B) Kallmann syndrome
C) Pituitary adenoma
D) Constitutional delay of puberty

Q42. A 55-year-old man with a known non-functioning pituitary macroadenoma (18mm) develops sudden-onset severe "thunderclap" headache, nausea, vomiting, diplopia (CN III palsy), and collapse. What is the MOST likely diagnosis and immediate management?

A) Migraine; analgesics and rest
B) Pituitary apoplexy; emergency IV hydrocortisone + neurosurgical evaluation
C) Subarachnoid hemorrhage; lumbar puncture
D) Bacterial meningitis; IV antibiotics

Q43. A 40-year-old obese woman with headaches has an MRI showing an enlarged sella with a thin rim of pituitary tissue pushed to one side. CSF pressure is elevated. She has no visual field defects and normal pituitary hormones. What is this condition?

A) Pituitary macroadenoma
B) Primary empty sella syndrome
C) Craniopharyngioma
D) Rathke's cleft cyst

Q44. A 7-year-old boy presents with a suprasellar calcified tumor, short stature, delayed puberty, and bitemporal visual field defects. What embryological structure does this tumor arise from?

A) Rathke's pouch
B) Neural crest cells
C) Ependymal cells
D) Infundibular stem

Q45. A 35-year-old woman with known lymphocytic hypophysitis (autoimmune) presents during pregnancy with fatigue, nausea, and polyuria. MRI shows pituitary enlargement. Which hormone deficiency is MOST characteristic of this condition?

A) GH
B) ACTH
C) TSH
D) Prolactin excess is more common

Q46. Sheehan syndrome vs. pituitary apoplexy: which distinguishing feature is CORRECT?

A) Both present with acute severe headache
B) Sheehan syndrome occurs postpartum due to ischemic necrosis; apoplexy is hemorrhage/infarction into an existing adenoma, presenting acutely
C) Apoplexy is painless; Sheehan is painful
D) Both require immediate surgery

Q47. A patient with hypopituitarism on hydrocortisone replacement develops a severe infection and fever. What should the patient do with their steroid dose?

A) Stop hydrocortisone immediately - it suppresses immunity
B) Double or triple the hydrocortisone dose ("sick day rules")
C) Switch to dexamethasone
D) Reduce dose to minimize side effects

Q48. Which of the following is NOT a recognized cause of hypopituitarism?

A) Sarcoidosis infiltrating the hypothalamus
B) Hemochromatosis (iron deposition)
C) Radiotherapy to the brain/skull base
D) Primary adrenal insufficiency (Addison's disease)

Q49. A 14-year-old girl has short stature, absent secondary sexual characteristics, and delayed bone age. FSH and LH are low. Sense of smell is normal. GnRH stimulation test shows LH/FSH response. What is the diagnosis?

A) Kallmann syndrome
B) Functional hypothalamic amenorrhea
C) Constitutional delay of puberty
D) Anorexia nervosa

Q50. A patient post-transsphenoidal surgery for a pituitary adenoma is in recovery. 12 hours later, he develops polyuria (5 liters/day), serum Na 148 mEq/L, serum osmolality 308, urine osmolality 110. What is the MOST likely diagnosis?

A) Hyperaldosteronism
B) Central diabetes insipidus (ADH deficiency post-surgery)
C) SIADH
D) Diabetes mellitus

Q51. A 45-year-old woman who had radiotherapy to the pituitary 10 years ago for a non-functioning adenoma presents with fatigue, cold intolerance, and low libido. What is the SEQUENCE of evaluation?

A) Treat empirically without testing
B) Assess anterior pituitary function: IGF-1, free T4/TSH, cortisol/ACTH stimulation test, LH/FSH/testosterone or estradiol
C) MRI only; no need for hormonal testing
D) Test only TSH and treat if low

Q52. Which investigation is the GOLD STANDARD for diagnosing secondary adrenal insufficiency (ACTH deficiency) in hypopituitarism?

A) 8 AM serum cortisol (if >18 mcg/dL = sufficient)
B) 24-hour urine cortisol
C) Insulin tolerance test (ITT) - gold standard (requires hypoglycemia stimulus)
D) ACTH level alone

BLOCK D - ADH, DIABETES INSIPIDUS, SIADH (Q53-Q75)

Q53. A 25-year-old man post head trauma develops polyuria (7 liters/day), extreme thirst, serum Na 150 mEq/L, serum osmolality 315 mOsm/kg, urine osmolality 85 mOsm/kg, urine specific gravity 1.002. What is the diagnosis?

A) Diabetes mellitus
B) Primary polydipsia
C) Central diabetes insipidus
D) Nephrogenic DI

Q54. Water deprivation test is performed. After 8 hours of water deprivation: urine osmolality = 180 mOsm/kg. DDAVP is then administered. After 2 hours: urine osmolality = 580 mOsm/kg (>50% rise). What does this indicate?

A) Primary (dipsogenic) polydipsia
B) Nephrogenic diabetes insipidus
C) Central diabetes insipidus
D) Normal response

Q55. A patient on long-term lithium carbonate for bipolar disorder develops polyuria and polydipsia. Serum Na is 148. Urine osmolality is 150 after water deprivation. DDAVP administration produces minimal rise in urine osmolality (<10%). What is the diagnosis and management?

A) Central DI; give DDAVP
B) Nephrogenic DI; switch lithium if possible + hydrochlorothiazide + amiloride
C) SIADH; fluid restrict
D) Primary polydipsia; reassurance

Q56. A 55-year-old male with known small cell lung cancer presents with confusion, nausea, and headache. Na is 118 mEq/L, serum osmolality 248, urine Na 45 mEq/L, urine osmolality 550 mOsm/kg. He is clinically euvolemic. What is the diagnosis?

A) Hypovolemic hyponatremia
B) SIADH (ectopic ADH from SCLC)
C) Addison's disease
D) Renal salt wasting

Q57. A patient with SIADH has Na of 112 mEq/L and is having seizures. What is the IMMEDIATE treatment?

A) Fluid restriction alone
B) IV 3% hypertonic saline at a controlled rate (raise Na by 1-2 mEq/L/hour initially, max 8-10 mEq/day)
C) Oral salt tablets
D) Tolvaptan immediately

Q58. A 30-year-old woman is treated for SIADH. Her sodium is raised from 110 to 128 mEq/L in 12 hours. Two days later, she develops dysarthria, dysphagia, and paraparesis. What complication has occurred?

A) Stroke
B) Wernicke's encephalopathy
C) Osmotic demyelination syndrome (central pontine myelinolysis)
D) Hypertensive encephalopathy

Q59. Urine osmolality in SIADH is characteristically:

A) Less than 100 mOsm/kg (very dilute)
B) Less than serum osmolality
C) Greater than 100 mOsm/kg (usually >300, inappropriately concentrated)
D) Equal to plasma osmolality

Q60. Which drug causes SIADH by potentiating ADH action at the collecting duct?

A) Lithium
B) Carbamazepine
C) Demeclocycline
D) Tolvaptan

Q61. Demeclocycline is used to treat chronic SIADH. Its mechanism of action is:

A) Blocks V2 receptors directly
B) Induces nephrogenic diabetes insipidus (blocks ADH action at collecting duct)
C) Suppresses ADH secretion from the hypothalamus
D) Promotes renal sodium retention

Q62. A 40-year-old man with pituitary surgery develops DI. He is treated with desmopressin nasal spray. Three weeks later he develops confusion, low Na (122), high urine osmolality. He drank extra water "to be safe." What happened?

A) Desmopressin stopped working
B) He developed secondary adrenal insufficiency
C) Desmopressin caused water retention (iatrogenic SIADH) because he drank excess water
D) He developed nephrogenic DI

Q63. A 3-year-old child presents with polyuria, polydipsia, and irritability. Father and paternal grandfather have similar symptoms. Urine is very dilute. DDAVP produces NO response. X-linked inheritance is suggested. What is the MOST likely diagnosis?

A) Central DI (autosomal dominant)
B) Nephrogenic DI (X-linked; aquaporin-2 or V2 receptor mutation)
C) Primary polydipsia
D) Type 1 diabetes mellitus

Q64. Which of the following is the MOST POTENT stimulus for ADH secretion?

A) Hypovolemia
B) Hypotension
C) Increased plasma osmolality
D) Nausea

Q65. A 65-year-old woman is admitted with confusion and Na of 126. She is on carbamazepine for epilepsy. She is euvolemic, urine Na is 38, urine osmolality 450. What is the underlying mechanism of hyponatremia?

A) Renal salt wasting
B) Carbamazepine potentiates ADH action -> SIADH
C) Hypothyroidism-induced hyponatremia
D) Addison's disease

Q66. ADH (vasopressin) is synthesized in which specific hypothalamic nuclei?

A) Ventromedial nucleus
B) Supraoptic and paraventricular nuclei
C) Arcuate nucleus
D) Lateral hypothalamic area

Q67. A 45-year-old woman undergoes pituitary surgery. On day 3, her sodium drops to 125 and urine osmolality is 480. She is euvolemic. This is consistent with the "triple phase response" after pituitary surgery. Which phase is this?

A) Phase 1: initial DI (ADH loss)
B) Phase 2: SIADH (release of stored ADH from damaged neurons)
C) Phase 3: permanent DI
D) Cerebral salt wasting

Q68. Which investigation BEST differentiates primary polydipsia from central DI in a patient with polyuria?

A) Serum sodium level
B) Urine specific gravity alone
C) Water deprivation test followed by DDAVP challenge
D) MRI pituitary

Q69. Langerhans cell histiocytosis (histiocytosis X) involving the hypothalamus/posterior pituitary classically presents with which endocrine manifestation?

A) Acromegaly
B) Cushing syndrome
C) Central diabetes insipidus
D) Hyperthyroidism

Q70. A 28-year-old pregnant woman in her third trimester develops polyuria and polydipsia. Plasma vasopressinase (placental enzyme) levels are elevated. What is this condition called?

A) Central DI
B) Nephrogenic DI
C) Gestational diabetes insipidus
D) Psychogenic polydipsia

Q71. Gestational diabetes insipidus: which drug is the treatment of choice and why?

A) Aqueous vasopressin; it is safe in pregnancy
B) Desmopressin (DDAVP); it is resistant to degradation by placental vasopressinase
C) Thiazide diuretics; safest in pregnancy
D) Fluid restriction alone

Q72. A patient with euvolemic hyponatremia (Na 125) and hypothyroidism is found to have TSH of 18 mIU/L. What is the FIRST treatment priority?

A) Hypertonic saline
B) Fluid restriction
C) Treat the underlying hypothyroidism with levothyroxine
D) Tolvaptan

Q73. A 50-year-old man with SIADH from carcinoma is resistant to fluid restriction. Which class of drugs specifically targets the V2 receptor to block ADH action and promote free water excretion?

A) Loop diuretics (furosemide)
B) Vaptans (tolvaptan, conivaptan)
C) Thiazide diuretics
D) Demeclocycline

Q74. A patient with suspected DI is being evaluated. Plasma osmolality is 320 mOsm/kg, but ADH level is undetectable. The kidney shows NO response to administered DDAVP. What is the diagnosis?

A) Severe dehydration
B) Central DI
C) Nephrogenic DI with concurrent dehydration
D) Osmoreceptor dysfunction

Q75. A 35-year-old runner collapses after a marathon. Na is 118, she is confused. She drank 8 liters of water during the race. Urine osmolality is 250. ADH is mildly elevated. What is the CORRECT diagnosis and management?

A) SIADH; fluid restrict and tolvaptan
B) Exercise-associated hyponatremia (dilutional); if symptomatic, give 100mL bolus of 3% hypertonic saline, repeat as needed; overall fluid restrict
C) Central DI; give DDAVP
D) Addisonian crisis; give IV hydrocortisone

HOW TO USE THIS MATERIAL

Answer format (when you respond):

Just write: Q1-A, Q2-C, Q3-B ... or answer block-by-block
I'll give you a full answer key with explanations, mark your score, and flag any wrong answers for revision

Scoring:

Block A (GH): Q1-18 = 18 marks
Block B (Prolactin): Q19-37 = 19 marks
Block C (Hypopituitarism): Q38-52 = 15 marks
Block D (ADH/DI/SIADH): Q53-75 = 23 marks
Total: 75 marks

Go at your own pace - answer one block at a time or all 75 together. Ready when you are! 💪Here's your complete pituitary module - everything you asked for is above:

What's included:

High-yield one-liners covering: Pituitary basics, GH/Acromegaly/Gigantism, Prolactin/Hyperprolactinemia, Hypopituitarism (Sheehan, Apoplexy, Kallmann, Craniopharyngioma), and ADH/DI/SIADH
75 clinical MCQs in new FMGE style (clinical vignette + SBA mix) across 4 blocks

How to proceed:

Start answering - block by block or all 75 at once (e.g., "Q1-C, Q2-A...")
I'll score you, give full explanations for every question, and highlight the ones to revise

Take your time and attempt honestly - that's how you'll identify your gaps. All the best! 🎯

I don't see the questions remake it

Here's everything remade cleanly - one-liners first, then all 75 MCQs.

PITUITARY GLAND - FMGE MASTER REVISION

PART 1 - HIGH-YIELD ONE-LINERS

PITUITARY BASICS

Pituitary sits in sella turcica of sphenoid bone
Anterior pituitary = Rathke's pouch (ectoderm) - secretes GH, TSH, ACTH, FSH, LH, Prolactin
Posterior pituitary = neural ectoderm - stores/releases ADH and Oxytocin (made in hypothalamus)
Most common pituitary tumor = non-functioning adenoma
Most common functioning pituitary tumor = prolactinoma
Microadenoma = <10mm | Macroadenoma = >/= 10mm
Bitemporal hemianopia = optic chiasm compression by macroadenoma

GROWTH HORMONE

Secreted by somatotrophs (most abundant pituitary cells)
GHRH = stimulates | Somatostatin (SRIF) = inhibits GH release
GH is a counter-regulatory hormone (raises blood glucose)
GH acts via IGF-1 (Somatomedin C) produced by the liver
Best screening test for GH excess = IGF-1 level
Gold standard confirmatory test for acromegaly = OGTT (75g) - GH fails to suppress below 1 ng/mL
Gold standard for GH deficiency = Insulin Tolerance Test (ITT)
GH peaks during slow-wave sleep, exercise, stress, hypoglycemia
Gigantism = GH excess BEFORE epiphyseal fusion
Acromegaly = GH excess AFTER epiphyseal fusion
Diagnostic delay in acromegaly = 5-10 years (classic)
Acromegaly features: prognathism, macroglossia, shoe/ring/hat size increase, hyperhidrosis, carpal tunnel syndrome, sleep apnea, colon polyps, HTN, DM
Most common cause = GH-secreting pituitary adenoma (>95%)
Ectopic acromegaly = bronchial carcinoid (GHRH-secreting)
Treatment: 1st line = transsphenoidal surgery; medical = octreotide/lanreotide (somatostatin analogues); pegvisomant (GH receptor antagonist - GH levels RISE on this drug)
MEN1 = pituitary adenoma + parathyroid + pancreatic tumors (menin gene)

PROLACTIN

Secreted by lactotrophs; under tonic dopamine inhibition (D2 receptors)
Blocking dopamine = prolactin rises ("inhibiting the inhibitor")
Stimulators: TRH, VIP, estrogen, suckling, stress, sleep
Normal: women <25 ng/mL, men <20 ng/mL; pregnancy up to 200-500 ng/mL
Drugs causing hyperprolactinemia: metoclopramide, domperidone, haloperidol, risperidone, paliperidone, clomipramine, morphine, OCP
Antipsychotics with LEAST hyperprolactinemia = clozapine, quetiapine
Hypothyroidism causes hyperprolactinemia via increased TRH
Stalk effect (disconnection) = prolactin usually <100-150 ng/mL
Prolactinoma: microprolactinoma = 20-250 ng/mL; macroprolactinoma = 200 to >10,000 ng/mL
Hook effect (prozone) = falsely LOW prolactin in massive macroprolactinoma - dilute sample to correct
Clinical features: galactorrhea, amenorrhea, infertility (females); erectile dysfunction, gynecomastia (males)
Treatment: 1st line = cabergoline (better than bromocriptine - twice weekly, more effective)
Bromocriptine = preferred in pregnancy (longest safety data)
Surgery = used if DA-resistant, intolerant, or apoplexy emergency
Prolactinoma in pregnancy = can enlarge (estrogen effect), especially macroprolactinoma

HYPOPITUITARISM

Order of hormone loss: GH > FSH/LH > TSH > ACTH > Prolactin (GH lost first)
Most common cause = pituitary adenoma (direct or post-surgical)
Sheehan syndrome = postpartum pituitary necrosis from hypovolemic shock
- First sign = failure to lactate (prolactin deficiency)
- Features: amenorrhea, loss of pubic/axillary hair, hypothyroidism, adrenal insufficiency
Pituitary apoplexy = hemorrhage into pituitary adenoma; sudden headache, visual loss, ophthalmoplegia; EMERGENCY
Empty sella = CSF herniation into sella; associated with obese multiparous women; usually asymptomatic
Kallmann syndrome = hypogonadotropic hypogonadism + anosmia (GnRH neurons fail to migrate)
Craniopharyngioma = most common suprasellar tumor in children; from Rathke's pouch; calcification on CT; causes hypopituitarism + bitemporal hemianopia + DI
Treatment rule: replace cortisol BEFORE thyroxine (otherwise precipitate adrenal crisis)

ADH (VASOPRESSIN) AND DIABETES INSIPIDUS

ADH made in supraoptic nucleus (mainly) + paraventricular nucleus of hypothalamus
Acts on V2 receptors in collecting duct → inserts aquaporin-2 → water reabsorption
V1 receptors = vascular smooth muscle (vasoconstriction)
Most potent stimulus = increased plasma osmolality; osmoreceptors in anterior hypothalamus
DI hallmark: polyuria (>3L/day) + dilute urine (osmolality <300, SG <1.005)

Feature	Central DI	Nephrogenic DI	Primary Polydipsia
Cause	ADH deficiency	ADH resistance	Excess water intake
Urine after deprivation	Dilute	Dilute	Concentrates
Response to DDAVP	>50% rise (good)	Minimal/none	Concentrates (good)
Treatment	DDAVP	Thiazide + amiloride	Fluid restriction

Causes of Central DI: neurosurgery, head trauma, craniopharyngioma, LCH, TB, sarcoidosis, idiopathic
Causes of Nephrogenic DI: lithium (most common drug), demeclocycline, hypercalcemia, hypokalemia, X-linked (aquaporin-2 mutation)

SIADH

Euvolemic hyponatremia + urine osmolality >100 (usually >300) + urine Na >20 + low serum osmolality
Causes: CNS (SAH, meningitis), lung (TB, SCLC - ectopic ADH), drugs (carbamazepine, SSRIs, cyclophosphamide, vincristine, chlorpropamide, oxytocin)
Treatment: fluid restriction (1st line); 3% hypertonic saline for severe symptomatic (seizures/coma); tolvaptan/conivaptan (vaptans) for chronic SIADH
Do NOT correct Na >8-10 mEq/L per 24 hours → risk of osmotic demyelination (central pontine myelinolysis)
Demeclocycline = treats chronic SIADH by inducing nephrogenic DI (2nd line)

PART 2 - 75 CLINICAL MCQs (NEW FMGE PATTERN)

BLOCK A - GROWTH HORMONE (Q1-Q18)

Q1. A 42-year-old man presents with progressively increasing shoe size over 8 years, prominent jaw, widely spaced teeth, and excessive sweating. His wife says he snores loudly. BP is 148/94 mmHg. Random GH is 12 ng/mL. Which ONE test CONFIRMS the diagnosis?

A) Serum IGF-1 level
B) MRI pituitary
C) 75g OGTT with serial GH measurement
D) 24-hour urinary GH

Q2. A 38-year-old woman with acromegaly has elevated IGF-1. During OGTT, GH nadir is 1.8 ng/mL. MRI shows a 14mm pituitary adenoma. What is the MOST appropriate first-line management?

A) Octreotide LAR injection
B) Cabergoline oral
C) Transsphenoidal surgery
D) Radiotherapy

Q3. A 16-year-old boy is referred for tall stature (198cm, >3SD for age). Parents are average height. He has coarse facial features, large hands, and excessive sweating. IGF-1 is markedly elevated. Epiphyses are open on X-ray. What is this condition called and what is the MOST likely cause?

A) Acromegaly; GH-secreting pituitary adenoma
B) Gigantism; bronchial carcinoid (GHRH-secreting)
C) Gigantism; GH-secreting pituitary adenoma
D) Constitutional tall stature; familial

Q4. A patient with acromegaly undergoes transsphenoidal surgery. Post-operatively, which finding indicates SURGICAL CURE?

A) GH < 5 ng/mL on a random sample
B) GH suppression to <1 ng/mL on OGTT + normal IGF-1
C) Normal MRI pituitary
D) Prolactin returning to normal

Q5. A 45-year-old man with acromegaly is on octreotide but IGF-1 remains elevated. He refuses surgery. A new drug is added that blocks the GH receptor peripherally. What is this drug and what is the expected effect on serum GH levels?

A) Cabergoline - GH levels fall
B) Pegvisomant - GH levels rise
C) Lanreotide - GH levels fall
D) Bromocriptine - GH levels fall

Q6. A 35-year-old woman with acromegaly has hypertension, impaired fasting glucose, colon polyps, and bilateral carpal tunnel syndrome. Which complication of acromegaly carries the HIGHEST risk of MORTALITY?

A) Colon cancer
B) Carpal tunnel syndrome
C) Cardiovascular disease (cardiomyopathy + hypertension)
D) Diabetes mellitus

Q7. Which of the following is a PHYSIOLOGICAL stimulus for GH secretion?

A) Hyperglycemia
B) Free fatty acid excess
C) Slow-wave (deep) sleep
D) Obesity

Q8. A 50-year-old man with a pituitary macroadenoma has low GH with poor response to glucagon stimulation. He has fatigue, central obesity, and reduced exercise capacity. Which is the BEST investigation to confirm GH deficiency in an adult?

A) Random serum GH level
B) IGF-1 alone
C) Insulin tolerance test (ITT)
D) 24-hour urine GH

Q9. A patient with acromegaly develops bitemporal hemianopia. Which structure is being compressed by the pituitary adenoma?

A) Optic nerve (CN II)
B) Optic chiasm
C) Optic tract
D) Lateral geniculate body

Q10. A 44-year-old woman with acromegaly complains of bilateral hand tingling and weakness, worse at night. Tinel's and Phalen's tests are positive. What is the mechanism of this complication?

A) Peripheral neuropathy from diabetes
B) Nerve entrapment from soft tissue and bony overgrowth (carpal tunnel syndrome)
C) Syringomyelia
D) Cervical radiculopathy

Q11. A patient on long-term octreotide for acromegaly develops right upper quadrant pain and elevated ALP. What is the MOST likely complication?

A) Hepatitis
B) Gallstones (cholelithiasis)
C) Pancreatitis
D) Primary sclerosing cholangitis

Q12. A 40-year-old woman with acromegaly has a family history of renal stones, peptic ulcer disease, and a pancreatic neuroendocrine tumor. Which syndrome should be considered?

A) MEN type 2A
B) MEN type 1
C) MEN type 2B
D) Carney complex

Q13. Which genetic mutation is MOST commonly responsible for sporadic GH-secreting pituitary adenomas?

A) RET proto-oncogene mutation
B) Gs-alpha subunit activating mutation (GNAS/gsp)
C) BRCA1 mutation
D) APC gene mutation

Q14. A 10-year-old child presents with headaches, visual disturbance, a suprasellar calcified mass on CT, and GH deficiency. What is the MOST likely diagnosis?

A) Germinoma
B) Craniopharyngioma
C) Optic glioma
D) Meningioma

Q15. Ectopic acromegaly from GHRH secretion is MOST commonly caused by which tumor?

A) Small cell lung cancer
B) Bronchial carcinoid
C) Pheochromocytoma
D) Medullary thyroid carcinoma

Q16. Which of the following inhibitors of GH secretion is produced in the hypothalamus AND the pancreas?

A) Dopamine
B) IGF-1
C) Somatostatin
D) Cortistatin

Q17. A 55-year-old man with acromegaly has sleep studies showing 35 apnea events per hour. What is the mechanism of sleep apnea in acromegaly?

A) Central apnea from hypothalamic compression
B) Obstructive sleep apnea from soft tissue overgrowth of pharynx and macroglossia
C) Respiratory muscle weakness
D) Brainstem compression

Q18. A patient with acromegaly is found to have a skin condition with multiple soft, pedunculated growths around the neck and axilla. These skin tags are associated with which serious co-morbidity?

A) Melanoma
B) Lymphoma
C) Premalignant colonic polyps and colon cancer
D) Gastric cancer

BLOCK B - PROLACTIN (Q19-Q37)

Q19. A 27-year-old woman presents with 6 months of amenorrhea, bilateral milky nipple discharge, and infertility. Serum prolactin is 320 ng/mL. MRI shows a 12mm pituitary adenoma. What is this adenoma classified as, and what is the FIRST-LINE treatment?

A) Corticotroph adenoma; hydrocortisone
B) Macroprolactinoma; cabergoline
C) Macroprolactinoma; transsphenoidal surgery
D) Microprolactinoma; bromocriptine

Q20. A 35-year-old male on risperidone for schizophrenia develops gynecomastia and decreased libido. Prolactin is 65 ng/mL. MRI pituitary is normal. What is the MECHANISM of hyperprolactinemia here?

A) VIP stimulation of lactotrophs
B) D2 receptor blockade preventing dopamine from inhibiting prolactin
C) Estrogen-mediated lactotroph proliferation
D) TRH-mediated stimulation

Q21. A 32-year-old woman has galactorrhea and amenorrhea. TSH is 12 mIU/L, free T4 is low, prolactin is 85 ng/mL. MRI pituitary is normal. What is the MOST likely cause of hyperprolactinemia?

A) Prolactinoma
B) Primary hypothyroidism causing elevated TRH which stimulates prolactin
C) Drug-induced
D) Stress-related

Q22. A patient with a massive macroprolactinoma has prolactin reported as 95 ng/mL on standard assay, but clinical picture suggests much higher levels. What phenomenon explains this falsely low result?

A) Macroprolactin (big-big prolactin biologically inactive form)
B) Hook effect (prozone phenomenon)
C) Laboratory calibration error
D) Partial response to previous treatment

Q23. Which antipsychotic is LEAST likely to cause hyperprolactinemia?

A) Haloperidol
B) Risperidone
C) Quetiapine
D) Paliperidone

Q24. A 24-year-old woman with microprolactinoma (prolactin 110, tumor 7mm) has been on cabergoline for 2 years. MRI now shows no visible tumor and prolactin is normal. She wants to stop treatment and conceive. What is the BEST advice?

A) She must take cabergoline lifelong
B) Cabergoline can be stopped after 2 years of normalization; monitor prolactin every 3 months; try for conception
C) Surgery is required before she can try for pregnancy
D) Bromocriptine must replace cabergoline before stopping

Q25. A woman with a microprolactinoma wants to conceive. Which dopamine agonist is PREFERRED once she becomes pregnant, based on the longest established safety record?

A) Cabergoline
B) Bromocriptine
C) Quinagolide
D) Pergolide

Q26. A 38-year-old woman with a known macroprolactinoma suddenly develops severe headache, right-sided ptosis, diplopia, and vomiting. CT shows hemorrhage within the pituitary gland. What is this emergency called and what is the IMMEDIATE treatment priority?

A) Subarachnoid hemorrhage; nimodipine
B) Pituitary apoplexy; IV hydrocortisone + urgent neurosurgical review
C) Hypertensive crisis; IV labetalol
D) Cavernous sinus thrombosis; anticoagulation

Q27. A 30-year-old woman on metoclopramide for chronic gastroparesis presents with bilateral galactorrhea and amenorrhea. Prolactin is 60 ng/mL. MRI pituitary is normal. What is the FIRST step in management?

A) MRI with contrast immediately
B) Start cabergoline
C) Stop metoclopramide and recheck prolactin after 3-4 days
D) Refer for pituitary surgery

Q28. A 33-year-old woman with a prolactinoma is RESISTANT to cabergoline even at maximum dose. Prolactin remains >600 ng/mL and MRI shows chiasmal compression causing visual field defects. What is the NEXT best step?

A) Add octreotide
B) Transsphenoidal surgery
C) Radiotherapy alone
D) Try bromocriptine instead

Q29. Which physiological condition produces the HIGHEST prolactin levels?

A) Stress
B) Exercise
C) Pregnancy (up to 200-500 ng/mL)
D) Sleep

Q30. A male patient with a macroprolactinoma has bitemporal hemianopia. He is started on cabergoline. Two weeks later, his vision dramatically improves WITHOUT surgery. What explains this?

A) Spontaneous tumor infarction
B) Tumor shrinkage from dopamine agonist therapy
C) Corticosteroid anti-inflammatory effect
D) Collateral optic nerve pathway activation

Q31. A 45-year-old male is on methadone maintenance therapy and reports loss of libido, erectile dysfunction, and low testosterone. Prolactin is 55 ng/mL. What is the mechanism?

A) Direct testicular toxicity of methadone
B) Opioid mu-receptor activation leading to indirect dopamine suppression, causing hyperprolactinemia and secondary hypogonadism
C) Pituitary adenoma induced by opioids
D) Estrogen excess from liver disease

Q32. A 29-year-old woman with a microprolactinoma becomes pregnant. What is the EXPECTED behavior of her tumor during pregnancy?

A) All microprolactinomas significantly enlarge during pregnancy requiring surgery
B) Microprolactinomas rarely enlarge symptomatically during pregnancy (only 2-5% of cases)
C) Macroprolactinomas never enlarge during pregnancy
D) Cabergoline must always be continued throughout pregnancy without exception

Q33. Which of the following drugs causes hyperprolactinemia by an UNKNOWN mechanism (not simple dopamine D2 receptor blockade)?

A) Haloperidol
B) Metoclopramide
C) Clomipramine
D) Domperidone

Q34. Prolactin receptor signaling involves which key intracellular kinase?

A) Receptor tyrosine kinase (intrinsic)
B) JAK2 (Janus Kinase 2)
C) Protein Kinase A (PKA)
D) Protein Kinase C (PKC)

Q35. A 25-year-old woman with a macroprolactinoma is started on cabergoline. After 3 months, prolactin drops from 1,500 to 200 ng/mL. After 6 months, MRI shows a 40% reduction in tumor size. What does this tell you about the primary mechanism of dopamine agonists in prolactinoma?

A) They only reduce hormone secretion without affecting tumor size
B) They directly bind D2 receptors on lactotrophs causing both prolactin reduction AND tumor shrinkage
C) They work only by suppressing estrogen
D) Tumor shrinkage occurs only after prolactin fully normalizes

Q36. A 55-year-old woman is on an antidepressant and develops galactorrhea. Which of the following is the MOST likely culprit antidepressant?

A) Fluoxetine (SSRI)
B) Clomipramine (tricyclic)
C) Mirtazapine
D) Bupropion

Q37. A chest wall injury causes nipple discharge in a 35-year-old woman. Prolactin is 35 ng/mL. MRI pituitary is normal. What is the mechanism?

A) Stress-induced hypothalamic dopamine suppression only
B) Neurogenic arc - chest wall stimulation mimics suckling, triggering prolactin release through spinal cord pathways
C) Direct pituitary stimulation from trauma
D) Estrogen release from adrenal gland during pain

BLOCK C - HYPOPITUITARISM (Q38-Q52)

Q38. A 30-year-old woman had massive postpartum hemorrhage requiring 6 units of blood after her third delivery. Six weeks later, she cannot breastfeed, has amenorrhea, loss of pubic and axillary hair, and profound fatigue. TSH and ACTH are both low. What is the DIAGNOSIS?

A) Primary hypothyroidism
B) Sheehan syndrome
C) Postpartum depression
D) Autoimmune hypophysitis

Q39. In a patient with progressive pituitary destruction (e.g., slowly enlarging adenoma), which hormone axis is LOST FIRST?

A) ACTH
B) TSH
C) GH
D) FSH/LH

Q40. A patient with hypopituitarism requires both cortisol replacement and thyroxine replacement. What is the CORRECT sequence?

A) Thyroxine first, then cortisol
B) Cortisol first, then thyroxine
C) Both simultaneously
D) Sequence is irrelevant

Q41. A 22-year-old male has never undergone puberty - no beard growth, no voice change, small testes, and low FSH/LH with low testosterone. He also has complete inability to smell since childhood. MRI pituitary is normal. What is the DIAGNOSIS?

A) Primary hypogonadism (Klinefelter syndrome)
B) Kallmann syndrome
C) Non-functioning pituitary adenoma
D) Constitutional delay of puberty

Q42. A 55-year-old man with a known 18mm non-functioning pituitary adenoma develops a sudden severe "thunderclap" headache, nausea, diplopia (CN III palsy), and collapse. BP is 100/60. What is the MOST likely diagnosis and IMMEDIATE management?

A) Migraine; analgesics and rest
B) Pituitary apoplexy; emergency IV hydrocortisone 100mg + urgent neurosurgical evaluation
C) Subarachnoid hemorrhage; lumbar puncture to confirm
D) Bacterial meningitis; IV antibiotics immediately

Q43. A 42-year-old obese woman with chronic headaches has MRI showing a large sella with a thin rim of pituitary tissue along the wall. CSF pressure is elevated. Pituitary hormones are all normal. Visual fields are intact. What is this condition?

A) Pituitary macroadenoma
B) Primary empty sella syndrome
C) Craniopharyngioma
D) Rathke's cleft cyst

Q44. A 7-year-old boy has a suprasellar calcified tumor, short stature, visual field defects, and GH deficiency. From which embryological remnant does this tumor arise?

A) Rathke's pouch
B) Neural crest cells
C) Ependymal cells
D) Infundibular stem

Q45. A patient with hypopituitarism on hydrocortisone replacement develops pneumonia and fever. He calls his doctor. What should he do with his steroid dose?

A) Stop hydrocortisone - it suppresses immunity during infection
B) Double or triple the hydrocortisone dose ("sick day rules") and seek medical attention
C) Switch to dexamethasone for better anti-inflammatory effect
D) Reduce dose to minimize immunosuppression

Q46. What distinguishes Sheehan syndrome from pituitary apoplexy?

A) Both present with acute severe thunderclap headache
B) Sheehan = postpartum ischemic necrosis from hypovolemia (subacute); Apoplexy = acute hemorrhage/infarction into an existing adenoma (sudden, dramatic onset)
C) Apoplexy is painless; Sheehan is always painful
D) Both require immediate surgery as first-line treatment

Q47. Which of the following is NOT a recognized cause of hypopituitarism?

A) Sarcoidosis infiltrating the hypothalamus
B) Hemochromatosis (iron deposition in pituitary)
C) Radiotherapy to the brain/skull base
D) Primary adrenal insufficiency (Addison's disease)

Q48. A patient post-transsphenoidal surgery for pituitary adenoma was discharged on day 5. On day 7, she develops hyponatremia (Na 124), headache, and confusion. She is euvolemic. Urine osmolality is 450. What is the MOST likely cause?

A) Central DI from surgery
B) SIADH (post-surgical "triple phase" - release of stored ADH from damaged neurons)
C) Adrenal insufficiency
D) Cerebral salt wasting

Q49. A 35-year-old woman undergoes pituitary surgery. On post-op day 1, urine output is 400mL/hour, Na is 148, serum osmolality 309, urine osmolality 95. She is thirsty. What is the DIAGNOSIS?

A) Normal post-operative diuresis
B) Central diabetes insipidus (ADH loss from surgical trauma)
C) SIADH
D) Diabetes mellitus

Q50. A 14-year-old girl has short stature, absent secondary sexual characteristics, and delayed bone age. FSH and LH are low. Smell is NORMAL. GnRH stimulation test shows a good LH/FSH response. What is the MOST likely diagnosis?

A) Kallmann syndrome (GnRH deficiency + anosmia)
B) Primary ovarian failure
C) Constitutional delay of puberty
D) Anorexia nervosa

Q51. In Sheehan syndrome, the FIRST clinical sign that typically appears postpartum is:

A) Amenorrhea
B) Failure to lactate (prolactin deficiency)
C) Hypothyroid symptoms
D) Features of adrenal insufficiency

Q52. Which investigation is the GOLD STANDARD for diagnosing secondary adrenal insufficiency (ACTH deficiency) in hypopituitarism?

A) 8 AM serum cortisol (>18 mcg/dL = normal)
B) 24-hour urine free cortisol
C) Insulin tolerance test (ITT)
D) Random ACTH level

BLOCK D - ADH, DIABETES INSIPIDUS, SIADH (Q53-Q75)

Q53. A 25-year-old man sustains a head injury in a road accident. Two days later he passes 7 liters of urine per day, is extremely thirsty, and has serum Na 150 mEq/L, serum osmolality 315 mOsm/kg, urine osmolality 80 mOsm/kg, urine specific gravity 1.001. What is the DIAGNOSIS?

A) Diabetes mellitus
B) Primary polydipsia
C) Central diabetes insipidus
D) Nephrogenic diabetes insipidus

Q54. Water deprivation test is performed on a patient with polyuria. After 8 hours without water: urine osmolality = 175 mOsm/kg. DDAVP is then administered. Two hours later: urine osmolality rises to 580 mOsm/kg (>50% increase). What is the INTERPRETATION?

A) Primary (dipsogenic) polydipsia
B) Nephrogenic diabetes insipidus
C) Central diabetes insipidus
D) Normal physiological response

Q55. A patient on long-term lithium for bipolar disorder has polyuria (5L/day) and polydipsia. Serum Na is 148. Urine osmolality after water deprivation is 145. After DDAVP, urine osmolality rises only minimally (<10%). What is the diagnosis and management?

A) Central DI; give DDAVP
B) Nephrogenic DI; stop or reduce lithium if possible + hydrochlorothiazide + amiloride
C) SIADH; fluid restrict
D) Primary polydipsia; reassurance

Q56. A 55-year-old male with small cell lung cancer presents with confusion, nausea, and headache. Lab results: Na 118 mEq/L, serum osmolality 248, urine Na 45 mEq/L, urine osmolality 550 mOsm/kg. He is clinically euvolemic. What is the DIAGNOSIS?

A) Hypovolemic hyponatremia
B) SIADH from ectopic ADH secretion by SCLC
C) Addison's disease
D) Renal salt wasting

Q57. A patient with SIADH has Na of 112 mEq/L and is having generalized tonic-clonic seizures. What is the IMMEDIATE treatment?

A) Fluid restriction alone - SIADH is treated this way
B) IV 3% hypertonic saline, raising Na by 1-2 mEq/L/hour, to a target rise of no more than 8-10 mEq/L in 24 hours
C) Oral salt tablets
D) Tolvaptan immediately (oral vaptan)

Q58. A patient treated for severe hyponatremia (Na raised from 108 to 130 mEq/L in 12 hours) develops dysarthria, dysphagia, and spastic paraparesis 48 hours later. What has occurred?

A) Stroke
B) Wernicke's encephalopathy
C) Osmotic demyelination syndrome (central pontine myelinolysis)
D) Hypertensive encephalopathy

Q59. Urine osmolality in SIADH is characteristically:

A) Less than 100 mOsm/kg (maximally dilute)
B) Less than the concurrent plasma osmolality
C) Greater than 100 mOsm/kg (usually >300, inappropriately concentrated)
D) Equal to plasma osmolality at all times

Q60. Which drug treats chronic SIADH by INDUCING nephrogenic diabetes insipidus (blocking ADH action at the collecting duct)?

A) Tolvaptan
B) Conivaptan
C) Demeclocycline
D) Furosemide

Q61. A 40-year-old man develops polyuria and polydipsia after pituitary surgery. He is started on desmopressin nasal spray. Three weeks later he develops confusion and Na is 122. Urine osmolality is 480. He reports drinking 4 liters of water daily "to be safe." What happened?

A) Desmopressin has stopped working
B) He developed secondary adrenal insufficiency
C) Desmopressin caused water retention because he drank excessively (iatrogenic dilutional hyponatremia)
D) He has now developed nephrogenic DI

Q62. A 3-year-old boy has polyuria, polydipsia, and irritability. His father and grandfather had similar symptoms. Urine is very dilute. DDAVP produces NO response. The condition appears X-linked. What is the MOST likely diagnosis?

A) Central DI (autosomal dominant)
B) Nephrogenic DI (X-linked V2 receptor or aquaporin-2 mutation)
C) Primary polydipsia
D) Type 1 diabetes mellitus

Q63. ADH (vasopressin) acts on which receptor in the renal collecting duct to cause water reabsorption?

A) V1 receptor
B) V2 receptor
C) V3 receptor
D) Oxytocin receptor

Q64. A 65-year-old woman on carbamazepine for epilepsy develops euvolemic hyponatremia (Na 126), urine Na 38, urine osmolality 450. No diuretics. Thyroid and adrenal function normal. What is the mechanism?

A) Renal salt wasting from carbamazepine nephrotoxicity
B) Carbamazepine potentiates ADH action at V2 receptors causing SIADH
C) Hypothyroidism-induced hyponatremia
D) Carbamazepine causes direct tubular damage

Q65. A patient undergoes pituitary surgery. On day 1 she has polyuria (DI). By day 3 she has euvolemic hyponatremia (SIADH). By day 10 she again has polyuria (DI). What is this pattern called?

A) Biphasic response
B) Triple-phase response of pituitary surgery
C) Alternating DI-SIADH-normal
D) Central pontine osmotic syndrome

Q66. Which investigation BEST differentiates central DI from primary polydipsia?

A) Serum sodium level alone
B) Urine specific gravity alone
C) Water deprivation test with DDAVP challenge
D) MRI pituitary alone

Q67. Langerhans cell histiocytosis involving the hypothalamus/posterior pituitary classically causes which SPECIFIC endocrine complication?

A) Acromegaly
B) Cushing syndrome
C) Central diabetes insipidus
D) Hyperthyroidism

Q68. A 28-year-old pregnant woman (34 weeks gestation) develops polyuria and polydipsia. Plasma vasopressinase (cysteine aminopeptidase) from the placenta is elevated, degrading endogenous ADH. What is this condition and what is the treatment?

A) Central DI; aqueous vasopressin
B) Gestational diabetes insipidus; desmopressin (DDAVP) - resistant to vasopressinase
C) Nephrogenic DI; thiazide diuretics
D) Primary polydipsia; fluid restriction

Q69. A 50-year-old man with SIADH from lung carcinoma is started on tolvaptan. What is the mechanism of action of tolvaptan?

A) Suppresses ADH secretion from hypothalamus
B) Blocks V2 receptors in collecting duct, promoting free water excretion (aquaresis)
C) Acts as a loop diuretic
D) Induces nephrogenic DI like demeclocycline

Q70. A 45-year-old woman with euvolemic hyponatremia (Na 125) is found to have TSH of 18 mIU/L and a low free T4. What is the FIRST treatment priority to correct her sodium?

A) Hypertonic saline
B) Fluid restriction
C) Treat the underlying hypothyroidism with levothyroxine
D) Tolvaptan

Q71. A patient is found to have plasma osmolality 320 mOsm/kg with undetectable ADH. DDAVP is given and produces NO change in urine osmolality. What is the CORRECT interpretation?

A) Central DI (ADH deficiency - respond to DDAVP)
B) Nephrogenic DI (kidney unresponsive to ADH - no response to DDAVP)
C) Primary polydipsia
D) Osmoreceptor dysfunction (adipsic DI)

Q72. A 35-year-old marathon runner collapses after the race. Na is 118 mEq/L. She is confused and had drunk 8 liters of water during the race. Urine osmolality is 250. ADH is mildly elevated (exertion + nausea stimulus). What is the CORRECT management?

A) SIADH protocol - fluid restrict and give tolvaptan
B) Exercise-associated hyponatremia - give 100mL bolus of 3% hypertonic saline, repeat once or twice as needed for seizures/severe symptoms; then fluid restrict
C) Central DI - give DDAVP
D) Addisonian crisis - give IV hydrocortisone

Q73. Osmoreceptor dysfunction (adipsic diabetes insipidus) is specifically associated with which vascular lesion?

A) Posterior communicating artery aneurysm
B) Anterior communicating artery aneurysm (especially post-clipping/resection)
C) Middle cerebral artery infarct
D) Basilar artery thrombosis

Q74. A patient with DI is being managed. Which statement about nephrogenic DI management is CORRECT?

A) DDAVP is the mainstay treatment
B) Thiazide diuretics paradoxically reduce urine volume by causing mild sodium depletion and increased proximal tubular water reabsorption
C) High-sodium diet is recommended
D) Furosemide is preferred over thiazides

Q75. A 60-year-old man with lung TB on rifampicin and other anti-TB drugs develops confusion and hyponatremia (Na 120). He is euvolemic, urine Na is 42, urine osmolality 390. Adrenal and thyroid function are normal. Which anti-TB drug is the MOST likely cause?

A) Rifampicin
B) Ethambutol
C) Cycloserine (can cause SIADH) or more commonly the underlying TB causing SIADH
D) Isoniazid

SCORING GUIDE

Block	Questions	Marks
Block A - Growth Hormone	Q1-Q18	18
Block B - Prolactin	Q19-Q37	19
Block C - Hypopituitarism	Q38-Q52	15
Block D - ADH/DI/SIADH	Q53-Q75	23
TOTAL	75	75

How to answer: Write your answers like this - Q1-C, Q2-A, Q3-B... block by block or all 75 together. I'll give you full marks, explanations for every question, and flag the ones you got wrong for targeted revision. Go for it! 💪

1b 2c 3c 4b 5b 6c 7c 8c 9b 10b 11a 12b 13b 14b 15c 16c 17b 18a 19b 20b 21b 22b 23c 24b 25b 26b 27c 28b 29c 30b 31b 32d 33b 34b 35b 36a 37c 38b 39c 40b 41b 42b 43b 44a 45b 46b 47a 48d 49b 50a 51a 52a 53c 54c 55c 56b 57d 58b 58b 60a 61b 62a 63b 64b 65b 66c 67a 68b 69b 70b 71d 72b 73d 74b 75b

Marking your answers now. Let me go through all 75 carefully.

COMPLETE ANSWER KEY + YOUR SCORE

BLOCK A - GROWTH HORMONE (Q1-Q18)

Q	Correct	Your Answer	Result	Key Explanation
Q1	C	B	❌	IGF-1 is SCREENING. OGTT with GH measurement is the GOLD STANDARD CONFIRMATORY test - GH must fail to suppress below 1 ng/mL
Q2	C	C	✅	Transsphenoidal surgery is always 1st line for acromegaly when a resectable adenoma is found
Q3	C	C	✅	Open epiphyses + GH excess = GIGANTISM (not acromegaly). Most common cause = pituitary adenoma
Q4	B	B	✅	Cure = GH <1 ng/mL on OGTT + normal IGF-1. Both criteria must be met
Q5	B	B	✅	Pegvisomant blocks GH receptor peripherally. GH levels RISE because negative feedback via IGF-1 is reduced. Monitor with IGF-1 NOT GH
Q6	C	C	✅	Cardiovascular disease (biventricular hypertrophy, cardiomyopathy, HTN) = #1 cause of death in acromegaly
Q7	C	C	✅	Slow-wave sleep = peak physiological GH stimulus. Hyperglycemia, FFA, obesity all SUPPRESS GH
Q8	C	C	✅	ITT is gold standard for GH deficiency in adults. Random GH is useless (pulsatile). IGF-1 alone is insufficient in adults
Q9	B	B	✅	Optic chiasm compression = bitemporal hemianopia (nasal fibers from both eyes cross here)
Q10	B	B	✅	Carpal tunnel = nerve entrapment from soft tissue/bony overgrowth. Classic in acromegaly
Q11	B	A	❌	Octreotide/somatostatin analogues reduce bile motility and gallbladder emptying → GALLSTONES. Not hepatitis
Q12	B	B	✅	MEN1 = pituitary + parathyroid (renal stones, hypercalcemia) + pancreatic NETs (peptic ulcer from gastrinoma)
Q13	B	B	✅	GNAS mutation (Gs-alpha activating) = ~40% of sporadic GH adenomas. Causes ligand-independent cAMP elevation
Q14	B	B	✅	Craniopharyngioma: child + suprasellar + calcification + GH deficiency + visual field defect = classic picture
Q15	B	C	❌	Bronchial carcinoid is the most common cause of ectopic GHRH secretion. Pheo can cause it but is much rarer
Q16	C	C	✅	Somatostatin is produced in the hypothalamus (inhibits GH), pancreatic D-cells (inhibits glucagon/insulin), and GI tract
Q17	B	B	✅	Obstructive sleep apnea from macroglossia + pharyngeal soft tissue overgrowth. NOT central
Q18	C	A	❌	Skin tags in acromegaly = marker for premalignant colonic polyps and colon cancer. This is a high-yield association

Block A Score: 13/18

BLOCK B - PROLACTIN (Q19-Q37)

Q	Correct	Your Answer	Result	Key Explanation
Q19	B	B	✅	>10mm = macroadenoma. Prolactin >200 = macro. 1st line = cabergoline (NOT surgery for prolactinoma)
Q20	B	B	✅	Risperidone = D2 blocker → removes dopamine's inhibitory control on lactotrophs → prolactin rises
Q21	B	B	✅	Hypothyroidism → elevated TRH → TRH stimulates lactotrophs → hyperprolactinemia. Treat hypothyroidism first
Q22	B	B	✅	Hook effect = very high antigen (prolactin) saturates both capture AND detection antibody → falsely LOW reading. Solution: dilute 1:100
Q23	C	C	✅	Quetiapine and clozapine have low D2 affinity = least prolactin elevation. Paliperidone = highest
Q24	B	B	✅	After 2 years of normalization + no visible tumor on MRI, cabergoline can be withdrawn in ~50% without recurrence
Q25	B	B	✅	Bromocriptine = longest safety record in pregnancy (used since 1970s). Cabergoline data is good but less extensive
Q26	B	B	✅	Pituitary apoplexy = hemorrhage into adenoma. Emergency: IV hydrocortisone FIRST (adrenal crisis risk), then neurosurgical eval
Q27	C	C	✅	Always stop the offending drug first and recheck prolactin after 3-4 days before any further workup
Q28	B	B	✅	Chiasmal compression + DA resistance = surgery. Vision at risk = surgical emergency
Q29	C	C	✅	Pregnancy = highest physiological prolactin (200-500 ng/mL due to estrogen stimulating lactotroph proliferation)
Q30	B	B	✅	Dopamine agonists can cause rapid tumor shrinkage (within days to weeks) - dramatic visual improvement without surgery is characteristic of prolactinoma
Q31	B	B	✅	Methadone (opioid) → mu receptor activation → indirect dopamine suppression → hyperprolactinemia → secondary hypogonadism
Q32	B	D	❌	Microprolactinomas rarely (<5%) enlarge in pregnancy. Macroprolactinomas enlarge in ~25%. Cabergoline is stopped at confirmation of pregnancy for microprolactinomas
Q33	C	B	❌	Clomipramine (TCA) causes hyperprolactinemia by UNKNOWN mechanism. Metoclopramide and domperidone work by D2 blockade (known mechanism)
Q34	B	B	✅	Prolactin receptor = type 1 cytokine receptor family (no intrinsic kinase). Signals through JAK2-STAT5 pathway
Q35	B	B	✅	Cabergoline causes both prolactin reduction AND tumor shrinkage by binding D2 receptors on lactotrophs
Q36	B	A	❌	Clomipramine (TCA) is the classic antidepressant causing hyperprolactinemia. SSRIs can mildly elevate prolactin but much less so. Clomipramine is the standard exam answer
Q37	B	C	❌	Chest wall injury triggers a neuro-arc via the spinal cord that mimics the suckling reflex, stimulating prolactin release through neurogenic pathways

Block B Score: 14/19

BLOCK C - HYPOPITUITARISM (Q38-Q52)

Q	Correct	Your Answer	Result	Key Explanation
Q38	B	B	✅	Massive PPH + failure to lactate + amenorrhea + loss of body hair + low TSH + low ACTH = Sheehan syndrome
Q39	C	C	✅	GH is always the first hormone lost in progressive pituitary destruction. FSH/LH next, then TSH, then ACTH
Q40	B	B	✅	Cortisol MUST be replaced before thyroxine. Starting T4 first increases cortisol metabolism → can precipitate acute adrenal crisis
Q41	B	B	✅	Hypogonadotropic hypogonadism + ANOSMIA = Kallmann syndrome (GnRH neuron migration failure from olfactory placode)
Q42	B	B	✅	Pituitary apoplexy = thunderclap headache + ophthalmoplegia + visual loss + hemodynamic collapse. IV hydrocortisone is FIRST (adrenal crisis is life-threatening)
Q43	B	B	✅	Empty sella = CSF herniates through diaphragma sellae compressing pituitary. Seen in obese multiparous women, pseudotumor cerebri
Q44	A	A	✅	Craniopharyngioma arises from Rathke's pouch remnants (squamous epithelial remnants of the craniopharyngeal duct)
Q45	B	B	✅	Sick day rules: double/triple hydrocortisone for illness, fever, vomiting. If vomiting → IM hydrocortisone. Never stop steroids during illness
Q46	B	B	✅	Key distinction: Sheehan = postpartum ischemic necrosis (subacute onset); Apoplexy = sudden hemorrhage into adenoma (acute dramatic presentation)
Q47	D	A	❌	Addison's disease (PRIMARY adrenal failure) does NOT cause hypopituitarism - it is a separate primary gland failure. Sarcoidosis, hemochromatosis, and radiotherapy all cause hypopituitarism
Q48	B	D	❌	Post-surgical SIADH is the "phase 2" of triple-phase response - stored ADH released from dying neurons → water retention → hyponatremia on day 5-14 post-op
Q49	B	B	✅	Post-op day 1 polyuria + high serum Na + dilute urine = central DI from surgical trauma to posterior pituitary/stalk
Q50	C	A	❌	GnRH stimulation test shows response = the pituitary CAN respond if stimulated → problem is at the hypothalamus level (not pituitary). This is constitutional delay or functional - in context of age 14 and normal smell, constitutional delay is most likely
Q51	B	A	❌	Failure to lactate (prolactin deficiency) is the FIRST and EARLIEST sign of Sheehan syndrome - appears immediately postpartum. Amenorrhea comes after
Q52	C	A	❌	ITT is gold standard for both GH deficiency AND secondary adrenal insufficiency. An 8AM cortisol >18 is reassuring but not gold standard for diagnosis

Block C Score: 9/15

BLOCK D - ADH / DI / SIADH (Q53-Q75)

Note: You submitted Q58 twice and skipped Q59. I've scored accordingly.

Q	Correct	Your Answer	Result	Key Explanation
Q53	C	C	✅	Post-trauma + polyuria + dilute urine + hypernatremia = central DI. Brain trauma damages posterior pituitary/stalk
Q54	C	C	✅	No concentration on deprivation BUT good response to DDAVP (>50% rise) = Central DI (ADH deficient but kidney responsive)
Q55	B	C	❌	Lithium causes NEPHROGENIC DI (not SIADH). Treat: stop/reduce lithium + thiazide + amiloride (amiloride specifically blocks lithium entry into collecting duct cells)
Q56	B	B	✅	SCLC = classic ectopic ADH producer. Euvolemic + low Na + concentrated urine + high urine Na = SIADH
Q57	B	D	❌	Tolvaptan is CONTRAINDICATED in severe/symptomatic hyponatremia (too rapid correction risk). Acute seizures from hyponatremia = IV 3% hypertonic saline IMMEDIATELY
Q58	C	B	❌	Raised Na too fast (from 108→130 in 12 hours = 22 mEq rise >> limit of 8-10/day) → osmotic demyelination syndrome (central pontine myelinolysis). Wernicke's is thiamine deficiency
Q59	C	B	❌	(You answered Q58 twice, so I've noted this) SIADH = urine is INAPPROPRIATELY CONCENTRATED (>100, usually >300) despite low plasma osmolality
Q60	C	A	❌	Demeclocycline = correct answer. It induces nephrogenic DI by blocking ADH action in collecting duct. Tolvaptan blocks V2 receptors but is NOT used as 2nd line the same way
Q61	B	B	✅	Classic scenario: DDAVP patient drinking excess water = free water retention = dilutional hyponatremia. Patients must be taught to allow a "breakthrough" day to excrete excess water
Q62	A	A	✅	Wait - correct answer is actually B. X-linked + no DDAVP response = Nephrogenic DI from V2 receptor mutation (X-linked). You answered A (Central DI autosomal dominant) = ❌
Q63	B	B	✅	V2 receptor in collecting duct → activates aquaporin-2 insertion → water reabsorption. V1 = vascular
Q64	B	B	✅	Carbamazepine potentiates ADH action at V2 receptors AND may increase ADH secretion → SIADH. Classic exam drug
Q65	B	B	✅	Triple-phase response: Phase 1 (DI, day 1-2) → Phase 2 (SIADH, day 5-14) → Phase 3 (permanent DI). Classic post-pituitary surgery pattern
Q66	C	C	✅	Water deprivation + DDAVP challenge = gold standard to differentiate central DI (responds to DDAVP) vs. nephrogenic (doesn't) vs. polydipsia (concentrates on deprivation)
Q67	C	A	❌	Langerhans cell histiocytosis (LCH/histiocytosis X) = classic cause of central DI in children. NOT acromegaly. LCH infiltrates the posterior pituitary/hypothalamus
Q68	B	B	✅	Gestational DI = placental vasopressinase degrades ADH. Treatment = DDAVP (synthetic, resistant to vasopressinase degradation)
Q69	B	B	✅	Tolvaptan = selective V2 receptor antagonist → blocks ADH action in collecting duct → excretes free water (aquaresis without sodium loss)
Q70	C	B	❌	Treat the CAUSE first. Hypothyroidism-associated hyponatremia resolves with levothyroxine. No need for hypertonic saline if Na not dangerously low
Q71	B	D	❌	Undetectable ADH + no response to DDAVP = Nephrogenic DI (the kidney cannot respond to ADH at all). Osmoreceptor dysfunction would have detectable ADH
Q72	B	B	✅	Exercise-associated hyponatremia = dilutional from excess hypotonic fluid intake. Symptomatic → 100mL bolus 3% NaCl. NOT SIADH (no pathological ADH source)
Q73	B	D	❌	Anterior communicating artery aneurysm (especially post-clipping) is the SPECIFIC lesion associated with osmoreceptor dysfunction/adipsic DI. Not basilar artery
Q74	B	B	✅	Thiazides paradoxically reduce urine volume in nephrogenic DI by causing mild volume depletion → increased proximal tubular reabsorption → less water reaches collecting duct
Q75	B	B	✅	Pulmonary TB itself causes SIADH (most common cause in the TB context). The scenario points to underlying disease, not rifampicin

Block D Score: 12/23

FINAL SCORECARD

Block	Your Score	Total	Percentage
Block A - GH	13	18	72%
Block B - Prolactin	14	19	74%
Block C - Hypopituitarism	9	15	60%
Block D - ADH/DI/SIADH	12	23	52%
TOTAL	48	75	64%

QUESTIONS YOU GOT WRONG - REVISION TARGETS

Errors to fix immediately:

Block A (5 wrong):

Q1 - IGF-1 = screening. OGTT = confirmatory. Never confuse these
Q11 - Octreotide → gallstones (reduced bile motility). High-yield side effect
Q15 - Bronchial carcinoid = ectopic GHRH (not pheochromocytoma)
Q18 - Skin tags in acromegaly = marker for colon cancer/polyps (not melanoma)

Block B (5 wrong):

Q32 - Microprolactinoma rarely enlarges in pregnancy (<5%). Stop cabergoline once pregnant
Q33 - Clomipramine (TCA) = unknown mechanism for hyperprolactinemia
Q36 - Clomipramine, not SSRIs, is the antidepressant most classically associated
Q37 - Chest wall injury → neurogenic arc → prolactin rise (spinal reflex)

Block C (6 wrong) - Your WEAKEST block:

Q47 - Addison's disease does NOT cause hypopituitarism (primary vs secondary distinction)
Q48 - Post-op day 7 hyponatremia = SIADH (phase 2 triple response), NOT adrenal insufficiency
Q50 - GnRH stimulation response = hypothalamic level problem = constitutional delay, NOT Kallmann
Q51 - Failure to lactate = FIRST sign of Sheehan (not amenorrhea)
Q52 - ITT = gold standard for secondary adrenal insufficiency (not morning cortisol)

Block D (6 wrong) - Your WEAKEST block:

Q55 - Lithium = nephrogenic DI, NOT SIADH
Q57 - Acute symptomatic hyponatremia (seizures) = 3% hypertonic saline STAT. Tolvaptan is contraindicated acutely
Q58 - Too rapid Na correction = osmotic demyelination (CPM). Not Wernicke's
Q60 - Demeclocycline induces nephrogenic DI to treat chronic SIADH
Q67 - LCH classically causes central DI (NOT acromegaly)
Q71 - No ADH + no DDAVP response = nephrogenic DI

PRIORITY REVISION LIST (Do these TODAY)

Lithium → nephrogenic DI (never SIADH)
Triple-phase response of pituitary surgery (DI → SIADH → DI)
Acute hyponatremia with seizures → 3% NaCl, NOT tolvaptan
Osmotic demyelination = too fast Na correction (max 8-10 mEq/day)
ITT = gold standard for BOTH GH deficiency AND secondary adrenal insufficiency
LCH = central DI (classic pediatric/young adult cause)
Sheehan: first sign = failure to lactate
Addison's = PRIMARY adrenal failure (NOT hypopituitarism)
Clomipramine = antidepressant causing hyperprolactinemia
Microprolactinoma = safely stop cabergoline before/at pregnancy

Overall: 64% - Decent foundation, but Block C (Hypopituitarism) and Block D (ADH/SIADH) need focused revision. These two blocks are heavily tested in FMGE clinical vignettes. Want me to deep-dive on the wrong ones with concept explanations, or move to the next endocrine topic?

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