Retinoblastoma as a possible primary intracranial tumor.

A 10-month-old infant with a small, unilateral, peripheral retinal lesion also had a large, well-encapsulated, suprasellar retinoblastoma. The primary vs. the metastatic nature of the intracranial tumor is considered. It is postulated that primary intracranial tumors may arise within areas of the central nervous system embryologically related to the retina in patients with the genetic form of retinoblastoma.