MICROSCOPIC DESCRIPTION: The sections show a moderately cellular tumour, forming perivascular pseudorosettes. The tumour cells form cuffs around blood vessels. There is mucoid material in-between the blood vessels and the tumour cells. The tumour cells have mildly enlarged ovoid nuclei and small nucleoli. Mitoses are inconspicuous. There is no microvascular proliferation or necrosis. The tumour cells are GFAP positive. The Ki-67 index is 1%. They are EMA negative. The features are those of myxopapillary ependymoma.
DIAGNOSIS: Spinal tumour: Myxopapillary ependymoma (WHO Grade I).