[Teratoma of the posterior cranial fossa]

Two cases of posterior cranial fossa teratomas are reported. The rarity of these lesions is stressed. In the material of surgically treated cases of brain tumours from a period of 12 years in only two patients teratomas of this location were found. In adults they are extremely rare. In both cases teratoma finding during the operation was a surprise for the neurosurgeons and this was confirmed by literature reports.