Pedunculated subependymomas of lateral ventricle.

The authors describe two cases of extremely rare, pedunculated subependymomas of lateral ventricle. One patient presented with symptoms of intracranial hypertension (case 2); CT scan revealed evidence of intraventricular mass, but in second patient (case 1) coexisting symptomatic anaplastic astrocytoma masked on CT-scan the presence of asymptomatic intraventricular tumour, which was found no earlier than at autopsy. The cellular origin of this rare intracranial neoplasm is discussed.