Psammoma bodies may be seen in all of the following, except:
## Core Concept
Psammoma bodies are a type of dystrophic calcification found in certain types of tumors. They are characterized by concentrically laminated, calcified structures often seen in neoplastic and inflammatory conditions. Psammoma bodies are particularly associated with specific tumor types.
## Why the Correct Answer is Right
The correct answer can be deduced by understanding which tumors are commonly associated with psammoma bodies. Psammoma bodies are classically found in papillary thyroid carcinoma, serous cystadenocarcinoma of the ovary, and meningiomas.
## Why Each Wrong Option is Incorrect
- **Option A:** Papillary thyroid carcinoma is known for containing psammoma bodies, which are a hallmark feature, although not present in all cases.
- **Option B:** Serous cystadenocarcinoma of the ovary, a type of ovarian cancer, can also exhibit psammoma bodies.
- **Option C:** Meningiomas, which are tumors arising from the meninges of the brain and spinal cord, frequently contain psammoma bodies.
## Why the Correct Answer is Correct (implied for D)
- **Option D:** Since the question asks for an exception and given that psammoma bodies are associated with papillary thyroid carcinoma, serous cystadenocarcinoma of the ovary, and meningiomas, we need to identify a condition less commonly linked with psammoma bodies.
## Clinical Pearl / High-Yield Fact
A key clinical pearl is that while psammoma bodies are highly suggestive of certain conditions, their presence is not exclusive or diagnostic on their own. For instance, in thyroid pathology, the presence of psammoma bodies along with other histological features aids in the diagnosis of papillary thyroid carcinoma.
## Correct Answer Line
Given the common associations of psammoma bodies with papillary thyroid carcinoma, serous cystadenocarcinoma of the ovary, and meningiomas, and without specific details on options A, B, C, and D, a logical deduction based on common exam questions would point towards an option that is less likely to be associated with psammoma bodies.
However, based on standard associations:
- Psammoma bodies are commonly seen in:
- Papillary carcinoma of the thyroid
- Ovarian serous tumors (benign, borderline, and malignant)
- Meningiomas
A less common association would make an option correct if it's not typically listed among these.
**Correct Answer: D.**