XXXX : clinicopathological features of six cases.

@entity1 @entity1757 @entity5 @entity3271
The clinical and pathological features of six @entity1 with so-called "intraventricular @entity3271 " are reported. The @entity5 had no predilection for sex, and the @entity1 ' age at diagnosis ranged from 15 to 39 years. The lesions were located in the lateral and/or third ventricles. Total @entity5 was performed in three @entity1 , and the remaining three underwent partial resection. Postoperative irradiation was given to five @entity1 . A follow-up study revealed that five @entity1 were free of recurrent @entity5 at 15 to 227 months after treatment, and one was alive with disease 25 months after surgery. Histologically, all @entity5 were composed of small uniform cells, with perinuclear halos and regular round nuclei. @entity5 cells were sometimes arranged around nucleus-free fibrillary zones. Mitoses were infrequent. Ultrastructurally, neoplastic cells had round nuclei with dispersed heterochromatin and organelle-sparse cytoplasm containing occasional microtubules, 20 to 25 nm in diameter, and scattered dense-core vesicles, 100 to 200 nm in diameter. Cell processes containing dense-core and clear vesicles were frequently present. Thus, these @entity5 should be considered neuronal in origin, and should be classified as " @entity1757 ."
