Para thyroid adenoma
Reading File
Finding Sources
Searching PubMed
"parathyroid adenoma" AND "primary hyperparathyroidism"
Finding Sources
Reading File
Reading File
Reading File
Finding Sources
Reading File
Reading File
Reading File
Reading File
Reading File
Loading Image
Reading File
Now I have comprehensive information from multiple authoritative textbooks. Let me compile a complete response.
Parathyroid Adenoma
Definition and Epidemiology
A parathyroid adenoma is a benign neoplasm of the parathyroid gland and the most common cause of primary hyperparathyroidism (PHPT), accounting for ~80% of cases. It is followed by parathyroid hyperplasia and, rarely, parathyroid carcinoma. PHPT has a prevalence of 1-3 per 1000 in the general population. Sporadic adenomas are almost always monoclonal, consistent with a neoplastic origin.
- Robbins Pathologic Basis of Disease, p. 1010
- Schwartz's Principles of Surgery, p. 1665
Etiology and Molecular Pathogenesis
Most parathyroid adenomas are sporadic, but two established molecular mechanisms drive their development:
-
Cyclin D1 (CCND1) gene inversion - A pericentromeric inversion on chromosome 11 relocates the CCND1 gene adjacent to the PTH gene promoter, causing overexpression of cyclin D1 (a cell cycle regulator), driving cell proliferation. Even without this inversion, cyclin D1 is overexpressed in up to 40% of adenomas.
-
MEN1 gene mutation - ~15% of sporadic tumors carry somatic mutations of the MEN1 tumor suppressor gene (chromosome 11q13), with loss of heterozygosity (LOH) at the second allele.
-
CDC73 mutation - Encodes parafibromin; mutated in ~70% of sporadic parathyroid carcinomas and occasionally in adenomas. Germline CDC73 mutations cause the rare hyperparathyroidism-jaw tumor (HPT-JT) syndrome.
Risk factors include neck irradiation (latency period of 30-40 years) and familial syndromes (MEN-1, MEN-2, MEN-4).
- Robbins Pathologic Basis of Disease, p. 1010
Pathology
Gross Appearance
- Almost always solitary (double adenomas occur in only 1.7-12% of PHPT cases)
- Weight averages 0.5-5 g (mean ~0.55 g; tumours up to 53 g recorded)
- Well-circumscribed, soft, tan to reddish-brown (or yellow-red to orange-brown) nodule
- More severe hypercalcemia correlates with larger adenoma size
- The remaining glands are normal or shrunken due to feedback suppression (helps distinguish from hyperplasia)
Microscopic Appearance
- Sheets of uniform, polygonal chief cells with small, centrally placed nuclei and pale/vacuolated cytoplasm
- Nests of larger oxyphil cells are also present; rarely, adenomas are composed entirely of oxyphil or water-clear cells
- A rim of compressed, non-neoplastic parathyroid tissue may be visible at the edge
- Mitotic figures are rare; bizarre/pleomorphic nuclei (endocrine atypia) may be present - this is NOT a criterion for malignancy
- Stromal fat is inconspicuous (unlike normal parathyroid)
Tc-99m sestamibi scan - focal uptake in left inferior parathyroid adenoma (arrow). Source: Robbins Pathologic Basis of Disease.
- Robbins Pathologic Basis of Disease, p. 1011
- Scott-Brown's Otorhinolaryngology, p. 2113
Variants of Parathyroid Adenoma (WHO 4th Ed, 2017)
| Variant | Key Features |
|---|---|
| Cystic adenoma | Cystic ab initio or secondary to subsiding post-infarction haematoma |
| Lipoadenoma (parathyroid hamartoma) | Rare; admixture of parenchymal cells with 20-90% mature adipocytes; ~50% associated with hypercalcaemia |
| Oxyphil adenoma | Composed entirely of oxyphil cells |
| Water-clear adenoma | Substantially composed of water-clear cells |
| Papillary variant | Rare; may mimic papillary thyroid carcinoma |
Secondary phenomena (not specific diagnostically) include: inflammation, infarction, haemorrhage, fibrosis, cystic degeneration, and metaplastic ossification.
- Scott-Brown's Otorhinolaryngology, p. 2207
Clinical Presentation
The classic mnemonic is: "Painful bones, renal stones, abdominal groans, and psychic moans"
Asymptomatic (most common today)
Because serum calcium is routinely measured, the majority of patients are diagnosed incidentally on blood chemistry. PHPT is the most common cause of asymptomatic hypercalcaemia.
Symptomatic
| System | Manifestation |
|---|---|
| Skeletal | Bone pain, fractures, osteoporosis, osteitis fibrosa cystica, subperiosteal resorption, brown tumours |
| Renal | Nephrolithiasis (calcium oxalate/phosphate), nephrocalcinosis, polyuria, polydipsia, renal insufficiency |
| GI | Nausea, vomiting, constipation, peptic ulcers (gastrin stimulation), pancreatitis |
| Neuromuscular | Muscle weakness, fatigue, depression, cognitive changes |
| Cardiovascular | Hypertension, arrhythmias |
- Robbins Pathologic Basis of Disease, p. 1012
- Schwartz's Principles of Surgery, p. 1667
Biochemical Diagnosis
| Test | Finding |
|---|---|
| Serum calcium | Elevated (hypercalcaemia) |
| PTH | Elevated or inappropriately normal (key: PTH should be low in hypercalcaemia from other causes) |
| Serum phosphate | Decreased (hypophosphataemia) |
| Chloride:phosphate ratio | Increased (>33) |
| Urinary calcium | Increased (helps exclude FHH - familial hypocalciuric hypercalcaemia, where urine calcium is low) |
| Urinary cAMP | Increased |
| Serum ALP | Elevated if bone disease present |
Key differential: PTH is high/normal in PHPT; PTH is low/undetectable in hypercalcaemia from malignancy (which uses PTHrP instead).
Localization Imaging
| Modality | Notes |
|---|---|
| Technetium-99m sestamibi scan | First-line; identifies single adenoma well; reduced accuracy for multiglandular disease |
| Neck ultrasound | Complements sestamibi; together give ~95% accuracy if both identify the same gland |
| 4D-CT | Useful in re-operative cases |
| MRI | Used for ectopic/mediastinal adenomas |
Adenomas are typically not palpable clinically unless cystic. They may also occur in ectopic sites: mediastinum, thyroid gland, oesophagus, or supernumerary glands - which can lead to failed cervical exploration.
Treatment
Surgery (definitive)
- Minimally invasive parathyroidectomy (MIP): Focused unilateral exploration guided by preoperative localization studies. Suitable when both sestamibi and ultrasound concordantly identify the same gland (~95% success).
- Bilateral neck exploration: Standard when localization fails, multiglandular disease is suspected, or IOPTH is unavailable.
- Intraoperative PTH monitoring (IOPTH): PTH has a 3-5 minute half-life; a >50% drop from baseline at 10 minutes confirms curative resection (the Miami criterion).
- Radio-guided parathyroidectomy: Uses pre-injected Tc-99m sestamibi and a handheld gamma probe; rarely used now as it offers little advantage over preoperative scanning.
Outcome: Excision is curative, normalizing biochemistry and improving bone mineral density. Up to 10% of patients relapse, sometimes years later.
Non-surgical management (for asymptomatic, ineligible patients)
-
Adequate hydration, avoid thiazides and immobilization
-
Cinacalcet (calcimimetic): Reduces serum calcium by increasing sensitivity of the CaSR to extracellular calcium; does not improve bone density
-
Bisphosphonates: Improve bone density
-
Schwartz's Principles of Surgery, p. 1670-1701
-
Scott-Brown's Otorhinolaryngology, p. 2086
Familial Associations
| Syndrome | Gene | Features |
|---|---|---|
| MEN-1 | MEN1 (11q13) | Parathyroid + pituitary + pancreatic tumours |
| MEN-2A | RET | Parathyroid + MTC + phaeochromocytoma |
| MEN-4 | CDKN1B | MEN-1-like, RET-negative |
| HPT-JT syndrome | CDC73 | Parathyroid carcinoma + ossifying jaw tumours |
| FHH | CASR | Hypocalciuric hypercalcaemia; no surgery benefit |
Recent Evidence (2024-2026)
- A 2024 systematic review in JCEM (PMID 38739762) confirms that parathyroidectomy has a significant positive skeletal effect in PHPT patients.
- A 2026 meta-analysis in ANZ J Surg (PMID 41721481) shows minimally invasive parathyroidectomy under locoregional anaesthesia is a safe and effective alternative to general anaesthesia.
Varicose vein, pre and clinical with management from cpg , investigations 101
Reading File
Finding Sources
Searching PubMed
"varicose veins" AND "clinical practice guideline"
Searching the Web
varicose veins CPG clinical practice guideline 2023 2024 management NICE SVS
Finding Sources
Finding Sources
Reading Web Page
varicose veins diagnosis management investigations treatment recommendations
Reading File
Reading File
Reading File
Reading File
Reading File
Reading File
Reading File
Reading File
Searching the Web
SVS AVF 2022 2023 varicose veins guidelines CEAP classification recommendations duplex endovenous ablation
Reading Web Page
varicose veins guidelines recommendations duplex compression endovenous ablation CEAP
Reading File
Finding Sources
Reading File
I now have comprehensive information from Bailey & Love, Schwartz's Surgery, Mulholland & Greenfield, Gray's Anatomy, and the SVS/AVF/AVLS 2022/2023 CPGs. Let me compile the full answer.
Varicose Veins - Complete Clinical Overview
Definition
Varicose veins are dilated, tortuous, elongated subcutaneous veins of the lower limb, measuring ≥3 mm in diameter (CEAP C2), caused by venous hypertension secondary to valvular incompetence. They are distinguished from:
- Telangiectasias / spider veins (C1): intradermal dilated vessels <1 mm
- Reticular veins (C1): dilated blue subdermal veins 1-3 mm
Epidemiology & Risk Factors
- Adult prevalence of visible varicose veins: 30-50%
- More common in women; increases markedly with age (Edinburgh Vein Study: 11.5% at 18-24 years up to 55.7% at 55-64 years)
Risk factors:
| Factor | Detail |
|---|---|
| Gender | More common in women |
| Age | Prevalence rises with age |
| Pregnancy | Progesterone relaxes vein walls; increased pelvic pressure |
| Family history | Strong familial susceptibility (genetic predisposition to connective tissue weakness) |
| Obesity | Raised intra-abdominal pressure |
| Prolonged standing | Occupational risk (inconclusive evidence) |
| Deep vein thrombosis (DVT) | Leads to secondary varicose veins |
| Pelvic masses | Obstruct venous return |
- Bailey and Love's Short Practice of Surgery, 28th Ed, p. 1051
Classification
1. Primary vs Secondary
| Type | Cause |
|---|---|
| Primary | Intrinsic weakness of venous wall / valve leaflets - no identifiable cause |
| Secondary | DVT (post-thrombotic syndrome), pelvic obstruction, AV fistula, pregnancy |
2. CEAP Classification (2020 Updated)
The internationally standardised classification system - Clinical, Etiologic, Anatomic, Pathophysiologic (CEAP):
| Class | Description |
|---|---|
| C0 | No visible or palpable signs of venous disease |
| C1 | Telangiectasias or reticular veins |
| C2 | Varicose veins (≥3 mm diameter) |
| C2r | Recurrent varicose veins |
| C3 | Oedema (venous origin, daily occurrence) |
| C4a | Pigmentation or eczema |
| C4b | Lipodermatosclerosis or atrophie blanche |
| C4c | Corona phlebectatica |
| C5 | Healed venous ulcer |
| C6 | Active venous ulcer |
| C6r | Recurrent active venous ulcer |
(SVS/AVF/AVLS 2022/2023 CPG; updated CEAP 2020)
Pathophysiology
Venous hypertension is the central mechanism, arising from:
- Valvular incompetence - valve leaflets fail to coapt, allowing reflux
- Primary wall weakness - defective connective tissue (reduced collagen/elastin ratio) causes vein dilatation, which stretches and separates valve cusps
- Calf muscle pump failure - ineffective muscle contraction fails to propel blood centrally
- Perforator incompetence - bidirectional flow in perforators allows high-pressure deep system blood to enter low-pressure superficial system
Key venous anatomy:
- Great Saphenous Vein (GSV) joins the femoral vein at the Saphenofemoral Junction (SFJ) in the groin - responsible for ~60% of varicose veins (medial thigh and calf distribution)
- Small Saphenous Vein (SSV) joins the popliteal vein at the Saphenopopliteal Junction (SPJ) - responsible for ~20% (posterolateral calf)
- Anterior Accessory GSV (AAGSV) - anterolateral thigh/calf distribution
Sustained venous hypertension leads to: capillary leakage → oedema → fibrin deposition → chronic inflammation → lipodermatosclerosis → ulceration.
- Fitzpatrick's Dermatology, p. 2185; Bailey and Love, p. 1052
Clinical Features
Presenting Symptoms (Subjective)
- Aching, heaviness, throbbing, burning, bursting sensation in affected leg
- Itching over varicosities
- Ankle swelling (oedema), especially in the evening
- All symptoms worsen with prolonged standing and are relieved by elevation and compression
- Cosmetic concern (most common complaint)
- Symptoms may be disproportionate to the severity of visible veins - a trial of compression helps confirm venous aetiology
Signs (Objective)
- Tortuous, dilated subcutaneous veins - visible and palpable
- Saphena varix - large dilated veins at SFJ, presents as a soft groin lump disappearing on lying (can mimic inguinal hernia; has a cough impulse)
- Oedema of ankle (pitting - venous)
- Haemosiderin pigmentation (brown staining) at medial gaiter area
- Venous eczema / stasis dermatitis - dry, scaly, itchy skin
- Lipodermatosclerosis - woody induration and fibrosis of the skin
- Atrophie blanche - white, scarred plaques
- Varicose (venous) ulcer - typically medial gaiter area (over medial malleolus), shallow, sloping edges, granulating base, painful
Complications
| Acute | Chronic |
|---|---|
| Thrombophlebitis (superficial vein thrombosis) | Venous eczema |
| Haemorrhage (spontaneous or traumatic) | Lipodermatosclerosis |
| - | Venous ulcer |
| - | Hyperpigmentation |
| - | Infection/cellulitis |
Clinical Tests (Bedside Examination)
Note: Tourniquet tests (Trendelenburg/Perthes) and handheld Doppler are now largely abandoned in favour of duplex ultrasound, which provides definitive anatomical and physiological information.
| Test | What it assessed | Status |
|---|---|---|
| Trendelenburg test | Level of valvular incompetence | Superseded |
| Perthes' test | Deep vein patency | Superseded |
| Handheld Doppler | Reflux at SFJ/SPJ | Superseded |
| Duplex ultrasound | Full venous mapping | Current gold standard |
- Bailey and Love, p. 1052
Investigations
1. Duplex Ultrasound Scan (DUS) - MANDATORY before any intervention
(CPG recommendation - SVS/AVF/AVLS 2022; NICE CG168)
The single most important investigation. Tourniquet tests and handheld Doppler have been abandoned.
Aims of duplex scan:
- Confirm reflux in the deep and superficial venous systems
- Define the exact distribution and extent of reflux and affected junctions (SFJ, SPJ, perforators)
- Assess deep vein patency (exclude obstruction/DVT)
- Assess suitability for treatment (diameter, extent, tortuosity)
- Detect thrombus within superficial veins
- Identify pelvic source of reflux
Technical parameters:
- High-frequency linear array transducer: 7.5-13 MHz
- Patient examined standing for diameter/reflux measurements
- Reflux definition: retrograde flow lasting ≥0.5 seconds (superficial/perforator veins) or ≥1 second (proximal deep veins)
- Elicited by calf/foot squeeze release, manual compression, or Valsalva
2. Other Investigations (Selected Cases)
| Investigation | Indication |
|---|---|
| Venous duplex (full leg) | All patients before intervention (CPG) |
| CT venography / MRI venography | Suspected pelvic source (May-Thurner, pelvic varicosities), suspected DVT extension |
| Ascending phlebography (venography) | Pre-deep vein reconstruction; rarely needed now |
| Descending venography | Deep valve incompetence assessment before valve reconstruction (highly specialised) |
| Abdominal USS / CT abdomen | Suspected secondary cause (pelvic mass, IVC obstruction) |
| ABI (Ankle-Brachial Index) | Mandatory before prescribing compression - to exclude peripheral arterial disease (PAD); ABI <0.8 = compression contraindicated |
| D-dimer + Doppler | If concurrent DVT/SVT suspected |
| Blood tests (FBC, coagulation) | Pre-operative work-up |
- Bailey and Love, p. 1052; Schwartz's Surgery, p. 1670
Management
Framework (SVS/AVF/AVLS 2022/2023 CPG + NICE CG168)
Step 1 - Conservative Management
Compression therapy:
- British Classification: Class 1 (14-17 mmHg), Class 2 (18-24 mmHg), Class 3 (25-35 mmHg)
- Improves symptoms but does NOT prevent progression or occurrence
- Compliance is universally poor
- CPG (NICE/SVS): Compression is an adjunct, NOT a substitute for definitive treatment; interventional treatment is superior and cost-effective
- ABI must be checked before prescribing; contraindicated if ABI <0.8
Lifestyle:
- Leg elevation
- Weight loss
- Exercise / calf muscle pump activation
- Avoid prolonged standing
Step 2 - Interventional Treatment (for symptomatic C2-C6)
(SVS/AVF/AVLS 2022/2023 CPG strongly recommends intervention over compression alone for symptomatic varicose veins)
A. Endothermal Ablation - First-line treatment (CPG Grade 1A)
Replaced surgical stripping as gold standard. Performed as outpatient under tumescent local anaesthesia.
Mechanism: A catheter is inserted percutaneously into the incompetent truncal vein. Tumescent anaesthetic surrounds the vein (compresses it, protects adjacent nerves, acts as heat sink). Thermal energy permanently occludes the vein.
| Technique | Details |
|---|---|
| Endovenous Laser Ablation (EVLA) | Wavelength typically 1470 nm; laser fibre inserted into vein; bare tip or radial firing designs available; very high technical efficacy |
| Radiofrequency Ablation (RFA) | Radiofrequency energy; ClosureFAST catheter most used; equally effective to EVLA; less post-procedure pain and bruising in some studies |
- Both are equivalent in efficacy; associated with faster recovery and less morbidity than open surgery
- Bailey and Love, p. 1051-1058; Schwartz's Surgery, p. 1671
B. Non-Thermal, Non-Tumescent (NTNT) Ablation
For patients unable to tolerate tumescent injection or with challenging anatomy.
| Technique | Details |
|---|---|
| Ultrasound-Guided Foam Sclerotherapy (UGFS) | Sclerosant (sodium tetradecyl sulphate) converted to foam (Tessari method: 1:3 or 1:4 sclerosant:air); foam maximises endothelial contact; performed under US guidance; lower efficacy than thermal ablation but suitable for recurrent/residual veins |
| Cyanoacrylate glue (VenaSeal) | Medical-grade adhesive injected into vein; no tumescent needed; no thermal injury; promising results |
| Mechanochemical ablation (MOCA - ClariVein) | Rotating wire causes mechanical endothelial injury + simultaneous sclerosant infusion; no heat or tumescent needed |
C. Open Surgical Treatment (still used, less commonly)
Indications: failed endovenous treatment, complex anatomy, recurrence, patient preference, or large saphena varix.
Saphenofemoral Ligation + GSV Stripping:
- Oblique groin incision at pubic tubercle level
- Dissect and ligate SFJ (flush ligation with all six tributaries)
- GSV stripped retrogradely to the knee (not ankle - reduces saphenous nerve injury risk)
- Followed by phlebectomy of residual varicosities
Saphenopopliteal Ligation + SSV Surgery:
-
Popliteal fossa incision at skin crease
-
Duplex marking of SPJ essential pre-operatively (very variable anatomy)
-
SSV can be ligated or stripped; risk of sural nerve injury with stripping
-
Bailey and Love, p. 1052-1658
D. Phlebectomy (Ambulatory / Stab Phlebectomy)
- Removal of varicose tributaries through multiple small (2-3 mm) stab incisions using phlebectomy hooks
- Performed as sole treatment (isolated tributary incompetence) or concurrently with truncal ablation
- Concomitant phlebectomy gives more rapid QOL improvement and allows single-visit treatment
- Superior to powered transilluminated phlebectomy for bruising and pain
E. Sclerotherapy (Liquid / Foam)
- Sclerosing agents: sodium tetradecyl sulphate (STS), polidocanol, hypertonic saline
- Liquid sclerotherapy for telangiectasias/reticular veins (C1)
- Foam sclerotherapy for larger varicosities and truncal veins
- Compression bandaging applied post-procedure for 3-5 days, then stockings for 2 weeks
- Complications: pigmentation, thrombophlebitis, DVT, skin necrosis, allergic reaction, visual disturbance (rare, with foam)
CPG Summary Table (SVS/AVF/AVLS 2022/2023 - Key Recommendations)
| Recommendation | Grade |
|---|---|
| Duplex ultrasound scanning before any intervention | Strong (1A) |
| Endovenous thermal ablation (EVLA/RFA) as first-line over open surgery for GSV/SSV reflux | Strong (1A) |
| UGFS as an alternative when thermal ablation not suitable | Conditional (2B) |
| Compression therapy for symptom relief as adjunct | Conditional |
| Compression alone NOT preferred over intervention for symptomatic patients | Strong |
| Treat truncal reflux + varicose tributaries in same session (if possible) | Consensus |
| Perforator vein treatment in mild-moderate disease: limited role | Consensus |
| ABI before compression prescription | Best Practice |
(Gloviczki P et al., J Vasc Surg Venous Lymphat Disord 2023 [Part I] and 2024 [Part II]; NICE CG168)
Special Situations
| Situation | Action |
|---|---|
| Thrombophlebitis (SVT) | NSAIDs, compression; exclude DVT with duplex; anticoagulate if propagating towards SFJ (<5 cm from SFJ = high risk DVT) |
| Haemorrhage from varicose vein | Elevate limb, apply pressure; firm compression bandaging; arrange urgent intervention |
| Venous ulcer (C6) | Compression (4-layer bandaging), wound care, debridement; ablate superficial reflux to aid healing; consider skin grafting for large ulcers |
| Pregnancy | Conservative (elevation, compression stockings); defer intervention until 3+ months post-partum |
| Recurrent varicose veins | Repeat duplex; UGFS or re-do endovenous ablation preferred over re-do open surgery |
Surgical Complications
(Bailey and Love, p. 1057)
| Complication | Incidence |
|---|---|
| Wound infection | Most common; reduced by prophylactic antibiotics |
| Saphenous nerve neuralgia (GSV stripping to knee) | Up to 7% |
| Sural nerve neuropraxia (SSV surgery) | Up to 20% |
| Common peroneal nerve injury (SSV surgery) | Up to 4% |
| DVT / PE | ~0.5% |
| Recurrence at 5-10 years | 20-30% |
Key Sources:
- Bailey and Love's Short Practice of Surgery, 28th Ed - Chapter 62 (Varicose Veins), pp. 1050-1058
- Schwartz's Principles of Surgery, 11th Ed - Chapter 23, pp. 1669-1672
- Mulholland & Greenfield's Surgery, 7th Ed - Chapter on Chronic Venous Insufficiency
- SVS/AVF/AVLS CPG Part I (Gloviczki et al., J Vasc Surg Venous Lymphat Disord 2023;11:231-261) - Duplex & Truncal Reflux Treatment
- SVS/AVF/AVLS CPG Part II (Gloviczki et al., J Vasc Surg Venous Lymphat Disord 2024;12:101670) - Compression, Tributaries & Complications
- NICE CG168 - Varicose veins: diagnosis and management (2013, reviewed 2016)
This is a shared conversation. Sign in to Orris to start your own chat.