Typical appearances on imaging of central neurocytoma. 

MACROSCOPIC DESCRIPTION: Labeled "Intraventricular tumor".  Two pieces of soft pale tan tissue, 5mm and 4mm. Part of one piece for frozen section. Frozen Section Diagnosis: Central neurocytoma.

MICROSCOPIC DESCRIPTION: Sections show a cellular tumor composed of relatively uniform cells with rounded nuclei and a fine chromatin pattern. There is perivascular pseudorosetting and a fine papillary matrix is present in some areas showing ill-defined rosette-like areas. There is no necrosis and there is no endothelial vascular proliferation. There is no calcification. Mitoses are scant. There is a strong synaptophysin staining.

DIAGNOSIS/COMMENT: Intra ventricular tumor - central neurocytoma.