Histology:
MACROSCOPIC DESCRIPTION:
Eight fragments of white to pale tan, rubbery tissueranging in size from 6 x 5 x 2mm to 40 x 25 x 10mm.
MICROSCOPIC DESCRIPTION:
Highly fibrillary glial lesion featuring clustered cell bodies accompanied by microcysts, with areas of prominent Rosenthal fibre formation, thromboed and scleroses blood vessels and old haemorrhage. Perivascular pseudorosettes are present focally. Mitotic figures are not seen. The lesion is separated from ventricular lining by a layer of white matter. Features qualify for subependymoma.
DIAGNOSIS: Subependymoma.