NCI: A rare, unilateral, benign or malignant embryonic neoplasm typically presenting as a cilliary body mass during childhood. It is composed of medullary epithelial cells.,NCI: A rare, usually aggressive malignant embryonal neoplasm of the central nervous system occurring in children. It is characterized by the presence of neuroepithelial cells which form papillary, trabecular, or tubular structures. Symptoms include headache, nausea, and vomiting.

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