Congenital choroid plexus papilloma: light and electron microscopic study of a case.

The outcome of a light and electron microscopic study of a congenital choroid plexus papilloma removed from a lateral cerebral ventricle of a 10-day-old male presenting hypertensive hydrocephalus at birth is reported. The tumor was diagnosed by CT and cerebral angiography. The findings, compared with those obtained from choroid plexuses of controls subjected to hemispherectomy for epilepsy, highlight the intense metabolic activity of the papilloma and the relevance of this to the communicating hydrocephalus that is frequently associated with it.