A 36-year-old woman presents with swelling in her neck that she first noticed 3 months ago. She also complains of intermittent watery diarrhea over the same time period. Physical examination reveals a nontender nodule in the left lobe of the thyroid. The patient’s mother died of thyroid cancer 8 years ago. The thyroid nodule is found to be “cold” by radioiodine scintiscan. A needle biopsy of the nodule reveals malignant cells and homogeneous eosinophilic material The tumor in the patient described in Question 38 is removed, and a section stained with Congo red reveals birefringent amyloid stroma. Genetic studies show that this patient has a familial cancer syndrome. In addition to hyperparathyroidism, the patient is advised that she is at risk of developing which of the following neoplastic diseases?
A 36-year-old woman presents with swelling in her neck that she first noticed 3 months ago. She also complains of intermittent watery diarrhea over the same time period. Physical examination reveals a nontender nodule in the left lobe of the thyroid. The patient’s mother died of thyroid cancer 8 years ago. The thyroid nodule is found to be “cold” by radioiodine scintiscan. A needle biopsy of the nodule reveals malignant cells and homogeneous eosinophilic material The tumor in the patient described in Question 38 is removed, and a section stained with Congo red reveals birefringent amyloid stroma. Genetic studies show that this patient has a familial cancer syndrome. In addition to hyperparathyroidism, the patient is advised that she is at risk of developing which of the following neoplastic diseases?
💡 Explanation
## **Core Concept**
The patient's presentation suggests a diagnosis of Medullary Thyroid Carcinoma (MTC), a type of thyroid cancer that originates from the parafollicular cells (also known as C cells), which produce calcitonin. The presence of a "cold" thyroid nodule that is malignant, along with symptoms such as watery diarrhea (possibly due to calcitonin or other peptide secretion by the tumor), and a family history of thyroid cancer, points towards a familial form of MTC, likely Multiple Endocrine Neoplasia type 2 (MEN2).
## **Why the Correct Answer is Right**
The key findings here are the presence of malignant cells in the thyroid nodule, the homogeneous eosinophilic material (likely amyloid, which is often seen in MTC), and the birefringent amyloid stroma on Congo red staining, all of which are characteristic of MTC. The familial aspect and the presence of amyloid are particularly suggestive of a hereditary form of MTC, likely as part of MEN2 syndrome. MEN2 syndrome is associated with an increased risk of developing MTC, pheochromocytoma (a tumor of the adrenal gland), and hyperparathyroidism.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, one would assess each option based on its relevance to MEN2 syndrome or other familial cancer syndromes associated with MTC.
- **Option B:** Similarly, without the specific content of Option B, one would evaluate its accuracy in relation to MEN2 or other syndromes.
- **Option C:**
- **Option D:** Without specific details on options B, C, and D, we focus on the correct answer being related to pheochromocytoma, a known association with MEN2 syndrome alongside hyperparathyroidism.
## **Clinical Pearl / High-Yield Fact**
A critical clinical pearl is that patients with MEN2 syndrome are at risk for developing MTC, pheochromocytomas, and hyperparathyroidism. Screening for these conditions is crucial in familial cases. The presence of amyloid in the thyroid tumor and a familial history should prompt genetic testing for RET mutations, which are associated with MEN2 syndromes.
## **Correct Answer:** . **Pheochromocytoma**
✓ Correct Answer: D. Pheochromocytoma
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