Question:
A patient is diagnosed with medullary thyroid carcinoma (MTC). Which syndrome is most commonly associated with MTC?
A patient is diagnosed with medullary thyroid carcinoma (MTC). Which syndrome is most commonly associated with MTC?
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Every patient with a new diagnosis of Medullary Thyroid Carcinoma requires immediate testing for RET proto-oncogene mutations.
If a patient tests positive for a RET mutation, family members must be tested, and prophylactic total thyroidectomy is often performed in early childhood.
If a patient tests positive for a RET mutation, family members must be tested, and prophylactic total thyroidectomy is often performed in early childhood.
Updated On: Sep 3, 2026
- MEN-2 syndrome
- Cowden syndrome
- Carney syndrome
- Gardner syndrome
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The Correct Option is A
Solution and Explanation
Concept:
The question asks the clinician to identify the specific inherited genetic syndrome that has the strongest and most defining clinical association with Medullary Thyroid Carcinoma (MTC).
Explanation:
• Medullary Thyroid Carcinoma (MTC) is a specialized neuroendocrine tumor arising from the parafollicular C-cells of the thyroid gland, which secrete calcitonin.
• While approximately 75% of MTC cases are sporadic, the remaining 25% of cases are highly hereditary and occur as the defining, central component of Multiple Endocrine Neoplasia Type 2 (MEN 2) syndromes.
• MEN 2 is an autosomal dominant genetic condition caused by an activating germline mutation in the RET proto-oncogene.
• MEN 2 is subdivided into two distinct phenotypes: MEN 2A and MEN 2B.
• MEN 2A consists of Medullary Thyroid Carcinoma (present in nearly 100% of individuals), Pheochromocytoma, and Primary Hyperparathyroidism.
• MEN 2B consists of a more aggressive Medullary Thyroid Carcinoma (often presenting in infancy), Pheochromocytoma, Mucosal Neuromas, and a distinct Marfanoid habitus.
• Because of this near 100% penetrance, every single patient newly diagnosed with MTC must undergo genetic counseling and germline RET mutation testing.
• Cowden syndrome (PTEN mutation) is associated with follicular thyroid cancer and breast cancer, not medullary.
• Gardner syndrome (APC mutation) is associated with familial adenomatous polyposis and papillary thyroid cancer, not medullary.
Final Answer:
Medullary Thyroid Carcinoma is most classically and strongly associated with MEN-2 syndrome.
The question asks the clinician to identify the specific inherited genetic syndrome that has the strongest and most defining clinical association with Medullary Thyroid Carcinoma (MTC).
Explanation:
• Medullary Thyroid Carcinoma (MTC) is a specialized neuroendocrine tumor arising from the parafollicular C-cells of the thyroid gland, which secrete calcitonin.
• While approximately 75% of MTC cases are sporadic, the remaining 25% of cases are highly hereditary and occur as the defining, central component of Multiple Endocrine Neoplasia Type 2 (MEN 2) syndromes.
• MEN 2 is an autosomal dominant genetic condition caused by an activating germline mutation in the RET proto-oncogene.
• MEN 2 is subdivided into two distinct phenotypes: MEN 2A and MEN 2B.
• MEN 2A consists of Medullary Thyroid Carcinoma (present in nearly 100% of individuals), Pheochromocytoma, and Primary Hyperparathyroidism.
• MEN 2B consists of a more aggressive Medullary Thyroid Carcinoma (often presenting in infancy), Pheochromocytoma, Mucosal Neuromas, and a distinct Marfanoid habitus.
• Because of this near 100% penetrance, every single patient newly diagnosed with MTC must undergo genetic counseling and germline RET mutation testing.
• Cowden syndrome (PTEN mutation) is associated with follicular thyroid cancer and breast cancer, not medullary.
• Gardner syndrome (APC mutation) is associated with familial adenomatous polyposis and papillary thyroid cancer, not medullary.
Final Answer:
Medullary Thyroid Carcinoma is most classically and strongly associated with MEN-2 syndrome.
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