Only some small cystic brain or intraventricular tumors could be biopsied or resected under endoscope initially.

最初一些脑内或脑室内的小型囊性肿瘤，可在内镜下活检或切除。

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Although central neurocytomas account for less than 1% of all intracranial neoplasms, they constitute approximately 50% of intraventricular tumors in patients 20-40 years old.

虽然中枢神经细胞瘤占颅内肿瘤不超过1%，但是在20 - 40岁脑室内肿瘤患者中，中枢神经细胞瘤大约占了50%。

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