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A huge teratoma in the posterior fossa in a neonate.

Arnstein et al. (1951) have defined a neonatal brain tumor as one occurring within 60 days after birth. Takaku et al. (1973) summarized reports of brain tumor in neonates in which 44 tumors were teratomas (61.9%). A teratoma of the brain is frequently found at the central neural axis and, at the time of birth, it is usually characterized mainly by macrocrania, with the tumor developing already gigantically (Oberman, 1964). Histologically, teratomata are divided into immature and mature or adult types and the development to a gigantic tumor is said a characteristic of the immature type.