Dissemination with malignant changes from a pineal tumor through the corpus callosum after total removal.

Within the germinal neoplasms of the central nervous system, the embryonal carcinoma is a very rare tumor. The authors report such a lesion arising on the corpus callosum in a child 8 months after a differentiated teratoma was totaly removed from the pineal region. The classification of the germ cell tumors of the central nervous system and their relation with similar tumors of the gonads are discussed. The treatment of the pineal tumors is also discussed.