The patient had surgery with histology:
Macroscopy:
The specimen consists of multiple friable grey-brown tissues measuring 14 mm x 6 mm x 4 mm.
Microscopy:
The sections show multiple fragments of lesional tissue demonstrating a cellular ependymal tumor with moderate cytologic atypia, abundant perivascular rosettes, and numerous true ependymal rosettes. Non-palisading necrosis is present. 3 mitoses per 10 high fields are seen. No evidence of microvascular proliferation, palisading necrosis, severe nuclear pleomorphism, or atypical mitotic figures.
Immunohistochemistry:
EMA: Widespread dot-like positivity in tumour cells.
D240: isolated dot-like positivity in tumour cells.
GFAP: weak cytoplasmic positivity
S100: diffuse cytoplasmic activity within the tumour.
Ki-2%.
Pathological diagnosis-ependymoma WHO grade 2.