Psamomma bodies are seen in?
**Core Concept**
Psammoma bodies are a type of dystrophic calcification seen in certain neoplasms, characterized by concentrically laminated calcifications. They are associated with **papillary thyroid carcinoma** and other tumors. This phenomenon is an example of **metastatic calcification**.
**Why the Correct Answer is Right**
The correct answer is related to the presence of psammoma bodies in specific types of tumors, most notably **papillary thyroid carcinoma**. These bodies form through the calcification of dead cells and tissue, often around a central nidus. The **FGFR2** and **RET/PTC** genetic alterations are implicated in the pathogenesis of papillary thyroid carcinoma.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as psammoma bodies are not typically associated with this condition.
**Option B:** Similarly, this option does not accurately represent the condition where psammoma bodies are characteristically seen.
**Option C:** This option is also incorrect as it does not relate to the primary condition where psammoma bodies are found.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that psammoma bodies are highly suggestive of **papillary thyroid carcinoma** when seen in a thyroid nodule. Their presence aids in the diagnosis of this malignancy.
**Correct Answer:** D. Papillary thyroid carcinoma.