Psammoma bodies in a thyroid lesion or the adjacent metastatic lymph nodes increase the possibility of-
**Core Concept**
Psammoma bodies are small, concentrically laminated calcifications found in certain types of thyroid neoplasms, particularly papillary thyroid carcinoma. They are a distinctive histopathological feature often associated with a specific clinical and prognostic significance.
**Why the Correct Answer is Right**
Psammoma bodies are a significant indicator of papillary thyroid carcinoma, which is a type of well-differentiated thyroid cancer. The presence of these calcifications in a thyroid lesion or adjacent metastatic lymph nodes suggests a higher likelihood of papillary thyroid carcinoma. This is because papillary thyroid carcinoma is known to produce a specific type of thyroglobulin, which may lead to the formation of psammoma bodies. The presence of psammoma bodies can also be associated with other features of papillary thyroid carcinoma, such as nuclear grooves and pseudoinclusions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because psammoma bodies are not typically associated with medullary thyroid carcinoma, which is a different type of thyroid cancer that originates from the parafollicular cells.
**Option B:** This option is incorrect because while psammoma bodies can be found in some cases of follicular thyroid carcinoma, they are not as strongly associated with this type of cancer as they are with papillary thyroid carcinoma.
**Option C:** This option is incorrect because psammoma bodies are not typically associated with anaplastic thyroid carcinoma, which is a highly aggressive and poorly differentiated type of thyroid cancer.
**Option D:** This option is incorrect because while psammoma bodies can be found in some cases of thyroiditis, they are not typically associated with this condition and are more specific to papillary thyroid carcinoma.
**Clinical Pearl / High-Yield Fact**
Psammoma bodies are a classic example of a "histopathological pearl" that can provide important clues about the diagnosis and prognosis of thyroid lesions. Remember that the presence of psammoma bodies in a thyroid lesion or adjacent metastatic lymph nodes significantly increases the likelihood of papillary thyroid carcinoma.
**Correct Answer: C. Anaplastic thyroid carcinoma is incorrect; the correct option was not provided.**