## **Core Concept**
Pseudo-rosettes are a histopathological feature observed in certain types of tumors. They are characterized by a cluster of tumor cells arranged around a central area, often resembling a flower-like pattern. This feature is particularly associated with neuroepithelial tumors.

## **Why the Correct Answer is Right**
The correct answer, **Ependymoma**, is associated with pseudo-rosettes because ependymomas are a type of glioma that arises from ependymal cells lining the ventricles and central canal of the spinal cord. These tumors can form perivascular pseudo-rosettes and sometimes true ependymal rosettes. The pseudo-rosettes in ependymomas are typically perivascular, with tumor cells arranged around blood vessels.

## **Why Each Wrong Option is Incorrect**
- **Option A: Medulloblastoma** - While medulloblastomas are primitive neuroectodermal tumors (PNETs) that can show rosette formation, they are more commonly associated with Homer-Wright rosettes, not pseudo-rosettes.
- **Option B: Neuroblastoma** - Neuroblastomas can form Homer-Wright rosettes, which are different from pseudo-rosettes. Homer-Wright rosettes are characterized by a central area of neuropil surrounded by neuroblastic cells.
- **Option D: Glioma** - This option is too broad, as gliomas encompass a wide range of tumors, including astrocytomas, oligodendrogliomas, and ependymomas. While some gliomas can form pseudo-rosettes, the option is not specific enough.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that pseudo-rosettes are particularly associated with ependymomas and are a helpful diagnostic feature in distinguishing these tumors from other types of gliomas or neuroepithelial tumors. The presence of pseudo-rosettes, especially perivascular pseudo-rosettes, is a strong indicator of ependymal differentiation.

## **Correct Answer: C. Ependymoma**