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Foundation Sciences · Genetics
Multiple Endocrine Neoplasia
MEN syndromes are autosomal dominant disorders predisposing to multiple endocrine tumours; MEN1 (MEN1 gene), MEN2A/B (RET proto-oncogene).
📌 Learning Objectives
- Describe the underlying mechanism of Multiple Endocrine Neoplasia.
- Identify the key clinical features and complications of Multiple Endocrine Neoplasia.
- Outline the appropriate investigations and management of Multiple Endocrine Neoplasia.
- Discuss the implications for patients and families of Multiple Endocrine Neoplasia.
📋 Overview
MEN1: parathyroid, pituitary and pancreatic tumours (3 Ps). MEN2A: medullary thyroid carcinoma, phaeochromocytoma, parathyroid disease. MEN2B: MTC, phaeochromocytoma, mucosal neuromas, marfanoid habitus.
🔬 Basic Science
MEN1: parathyroid, pituitary and pancreatic tumours (3 Ps). MEN2A: medullary thyroid carcinoma, phaeochromocytoma, parathyroid disease. MEN2B: MTC, phaeochromocytoma, mucosal neuromas, marfanoid habitus.
🏥 Clinical Relevance
Cascade genetic testing identifies at-risk family members for surveillance.
🧪 Investigations
Investigation depends on clinical context: relevant blood tests, imaging, and specific genetic or histopathological tests as appropriate. Refer to specialist services where indicated.
💊 Management
Management is condition-specific and typically multidisciplinary, combining medical therapy, surgical intervention where appropriate, supportive care, and family/genetic counselling.
Revision Resources – expand the sections below for high-yield notes, exam pearls, key facts and further reading.
MLA High-Yield Notes & Quick Revision ⌄
Common SBA themes: recognising the underlying mechanism, identifying classic clinical features, and choosing the first-line investigation or management step. Watch for inheritance pattern and characteristic associations.
men1
men2
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phaeochromocytoma
- MEN1: parathyroid, pituitary, pancreatic tumours (3 Ps); MEN1 gene mutation.
- MEN2A: medullary thyroid cancer (MTC), phaeochromocytoma, parathyroid hyperplasia; RET mutation.
- MEN2B: MTC, phaeochromocytoma, mucosal neuromas, marfanoid habitus; specific RET codon 918 mutation.
- Prophylactic thyroidectomy is offered in early childhood for MEN2.
- Cascade testing identifies pre-symptomatic relatives for surveillance.
Exam Pearls ⌄
⭐ High Yield
MEN1: parathyroid, pituitary, pancreatic tumours (3 Ps); MEN1 gene mutation.
MEN2A: medullary thyroid cancer (MTC), phaeochromocytoma, parathyroid hyperplasia; RET mutation.
MEN2B: MTC, phaeochromocytoma, mucosal neuromas, marfanoid habitus; specific RET codon 918 mutation.
Prophylactic thyroidectomy is offered in early childhood for MEN2.
Cascade testing identifies pre-symptomatic relatives for surveillance.
💡 Clinical Pearl
Men1: Cascade genetic testing identifies at-risk family members for surveillance.
⚠️ Exam Tip — Common Mistakes
Confusing the mechanism of Multiple Endocrine Neoplasia with related conditions.
Missing classic clinical features of Multiple Endocrine Neoplasia in SBA stems.
Failing to consider Multiple Endocrine Neoplasia in the differential diagnosis.
Key Facts ⌄
MEN1: parathyroid, pituitary, pancreatic tumours (3 Ps); MEN1 gene mutation.
MEN2A: medullary thyroid cancer (MTC), phaeochromocytoma, parathyroid hyperplasia; RET mutation.
MEN2B: MTC, phaeochromocytoma, mucosal neuromas, marfanoid habitus; specific RET codon 918 mutation.
Prophylactic thyroidectomy is offered in early childhood for MEN2.
Cascade testing identifies pre-symptomatic relatives for surveillance.
Related Topics ⌄
References ⌄
- GMC MLA Content Map
- NICE Clinical Knowledge Summaries
- BMJ Best Practice
Further Resources
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