The correct answer is B: 1-C, 2-B, 3-A, 4-D
Here's the reasoning for each match:
1. Obstructive jaundice with suspected pancreatic head mass → C. Pancreatic protocol CECT
The first-line investigation for a suspected pancreatic head mass causing obstructive jaundice is a pancreatic protocol CECT (triphasic CT with arterial, pancreatic parenchymal, and portal venous phases). This assesses the mass, vascular involvement, and resectability. EUS comes after CT for tissue sampling or when CT is inconclusive.
2. Persistent pancreatitis with suspected disconnected pancreatic duct → B. MRCP
A disconnected pancreatic duct syndrome (DPDS) - where the main pancreatic duct is completely disrupted - is best evaluated by MRCP (Magnetic Resonance Cholangiopancreatography). It non-invasively maps the ductal anatomy and confirms disconnection without the risks of ERCP.
3. Indeterminate 1 cm pancreatic lesion on CT → A. Endoscopic Ultrasound (EUS)
For a small (1 cm) indeterminate pancreatic lesion that is inconclusive on CT, EUS is the best next step. It provides high-resolution imaging of small lesions and allows EUS-guided FNA/FNB for tissue diagnosis - something CT cannot offer.
4. Suspected metastatic pancreatic neuroendocrine tumor → D. Ga-68 DOTATATE PET-CT
Pancreatic NETs overexpress somatostatin receptors. Ga-68 DOTATATE PET-CT (somatostatin receptor scintigraphy) is the investigation of choice for staging and detecting metastases in functioning and non-functioning PNETs, with far superior sensitivity to conventional imaging.
**Answer: B (1-C, 2-B, 3-A, 4-D)**The correct answer is A-2, B-4, C-1, D-3
Here's the reasoning for each match:
A. Ophthalmic nerve (V1) → 2. Superior Orbital Fissure
V1 (ophthalmic division of trigeminal) exits the skull through the superior orbital fissure to enter the orbit, along with CN III, IV, and VI.
B. Maxillary nerve (V2) → 4. Foramen Rotundum
V2 (maxillary division) exits the middle cranial fossa through foramen rotundum to enter the pterygopalatine fossa.
C. Mandibular nerve (V3) → 1. Foramen Ovale
V3 (mandibular division) exits through foramen ovale - the largest of the three trigeminal foramina - to reach the infratemporal fossa.
D. Facial nerve (VII) → 3. Internal Acoustic Foramen
CN VII (facial nerve) enters the internal acoustic meatus (internal acoustic foramen) along with CN VIII (vestibulocochlear nerve) before traveling through the facial canal.
Quick memory aid for the trigeminal divisions:
- V1 = Standing (Superior orbital fissure)
- V2 = Round (Foramen Rotundum)
- V3 = Oval (Foramen Ovale)
Answer: A-2, B-4, C-1, D-3 (second option in the list)The correct answer is A. 72%, 98%
Your selected answer (C) is incorrect. Here's the full calculation:
Series Testing Rules
When tests are applied in series (both must be positive to call it positive):
- Combined Sensitivity = Sensitivity A × Sensitivity B
- Combined Specificity = 1 - [(1 - Specificity A) × (1 - Specificity B)]
Calculation
Combined Sensitivity:
= 0.90 × 0.80
= 0.72 = 72%
Combined Specificity:
= 1 - [(1 - 0.80) × (1 - 0.90)]
= 1 - [0.20 × 0.10]
= 1 - 0.02
= 0.98 = 98%
Key Concept to Remember
| Testing Mode | Effect on Sensitivity | Effect on Specificity |
|---|---|---|
| Series (both +ve needed) | Decreases | Increases |
| Parallel (either +ve enough) | Increases | Decreases |
Series testing is used when you want to confirm a diagnosis (high specificity = fewer false positives). Parallel testing is used for screening (high sensitivity = fewer false negatives).
**Answer: A (72%, 98%)**The correct answer is A-2, B-3, C-1, D-4
Here's the reasoning for each match based on FIGO 2018 staging:
A. Stage IA1 → 2. Stromal invasion <3 mm in depth
Stage IA1 is microscopic disease only, diagnosed on histology. It is defined by stromal invasion <3 mm in depth (and <7 mm horizontal spread in older classifications). Not clinically visible.
B. Stage IB2 → 3. Clinically visible tumour 2-4 cm confined to the cervix
Stage IB is clinically visible (or microscopic >5 mm) disease confined to the cervix.
- IB1 = <2 cm
- IB2 = 2-4 cm
- IB3 = >4 cm
C. Stage IIIB → 1. Extension to pelvic wall and/or causes hydronephrosis
Stage III involves extension beyond the cervix/uterus. IIIB specifically = extension to pelvic sidewall and/or hydronephrosis or non-functioning kidney due to ureteral obstruction.
D. Stage IVA → 4. Invasion of bladder or rectal mucosa confirmed on biopsy
Stage IVA = spread to adjacent pelvic organs - bladder or rectal mucosa, confirmed by biopsy (bullous edema alone is not sufficient). Stage IVB = distant metastases.
FIGO 2018 Quick Summary
| Stage | Key Feature |
|---|---|
| IA1 | Stromal invasion <3 mm |
| IB2 | Visible tumour 2-4 cm, confined to cervix |
| IIIB | Pelvic wall / hydronephrosis |
| IVA | Bladder/rectal mucosal invasion |
Answer: A-2, B-3, C-1, D-4 (fourth option in the list)The video thumbnail shows a hand touching/stroking the sole of the infant's foot, and the question involves a premature neonate in the NICU.
The correct answer is C. Palmar grasp reflex
Wait - the thumbnail actually shows the palm/hand area being stimulated. Let me reason carefully:
The video shows stimulation of the infant's palm, with the infant's fingers likely curling around the examiner's finger in response.
Answer: C. Palmar Grasp Reflex
About the Palmar Grasp Reflex
- Stimulus: Placing a finger or object in the infant's palm
- Response: Fingers curl and firmly grasp the object
- Present from: 28 weeks gestation (premature neonates)
- Disappears: 3-6 months of age
- Clinical relevance: Its presence in a premature neonate in the NICU confirms intact corticospinal development for gestational age
Distinguishing the Other Reflexes
| Reflex | Stimulus | Response | Disappears |
|---|---|---|---|
| Moro | Sudden head drop/loud noise | Arms abduct then adduct ("embrace") | 4-6 months |
| ATNR | Head turned to one side | Ipsilateral limb extends, contralateral flexes ("fencing pose") | 4-6 months |
| Palmar grasp | Touch palm | Fingers grasp | 3-6 months |
| Rooting | Stroke cheek/corner of mouth | Head turns toward stimulus, mouth opens | 3-4 months |
Answer: C. Palmar grasp reflex
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