Rosettes are characteristic in:
**Core Concept**
Ependymal cells give rise to a type of tumor known as ependymoma, which can exhibit rosettes. The formation of rosettes in tumors is a characteristic histopathological feature that can aid in diagnosis.
**Why the Correct Answer is Right**
Ependymomas arise from the ependymal cells lining the ventricles and central canal of the spinal cord. The rosettes in ependymomas are formed by the central core of tumor cells surrounded by a palisade of nuclei, resembling a flower. This distinctive histological pattern is a diagnostic hallmark of ependymomas. The rosettes are thought to represent a primitive, embryonic arrangement of cells.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the characteristic histopathological feature of medulloblastomas is Homer Wright rosettes, which are different from ependymoma rosettes.
**Option B:** This option is incorrect because pilocytic astrocytomas are a type of glioma that can exhibit perivascular pseudorosettes, but not the characteristic ependymoma rosettes.
**Option C:** This option is incorrect because oligodendrogliomas are a type of glioma that do not typically exhibit rosettes.
**Clinical Pearl / High-Yield Fact**
When diagnosing brain tumors, it's essential to recognize the characteristic histopathological features, such as rosettes, to distinguish between different tumor types.
**Correct Answer: C. Ependymoma.**