Amyloidosis is associated with which thyroid carcinoma?
**Core Concept**
Amyloidosis refers to the deposition of abnormal proteins, known as amyloid, in various tissues and organs. In the context of thyroid carcinoma, amyloidosis is a rare condition characterized by the accumulation of amyloid proteins in the thyroid gland, which can lead to its dysfunction.
**Why the Correct Answer is Right**
Medullary thyroid carcinoma (MTC) is a type of thyroid cancer that originates from the parafollicular cells (also known as C-cells). These cells produce calcitonin, a hormone involved in calcium homeostasis. In MTC, the abnormal C-cells can produce excess calcitonin, which can lead to amyloid deposition in the thyroid gland. This amyloid deposition is a characteristic feature of MTC and can be detected through histopathological examination.
**Why Each Wrong Option is Incorrect**
* **Option A:** Papillary thyroid carcinoma is the most common type of thyroid cancer, but it is not typically associated with amyloidosis.
* **Option B:** Follicular thyroid carcinoma is another type of thyroid cancer, but it is not characteristically linked to amyloid deposition.
* **Option D:** Anaplastic thyroid carcinoma is a highly aggressive and rare type of thyroid cancer, but it is not specifically associated with amyloidosis.
**Clinical Pearl / High-Yield Fact**
MTC is often associated with genetic mutations, particularly in the RET proto-oncogene, which can lead to familial cases of the disease. Identifying these genetic mutations is crucial for early detection and management of MTC.
**Correct Answer: C. Medullary thyroid carcinoma.