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Intracranial fetus in fetu: report of a case.

A case of intracranial fetus found in a two-month-old Chinese girl is reported. She was born by cesarean section at term because of cephalopelvic disproportion. The infant was later admitted because of a progressive increase in head circumference. CT brain scan showed marked hydrocephalus and a huge heterogenous mass with multifocal calcification, cystic structures and soft tissue density occupying the left lateral ventricle and the third ventricle. The lesion was completely resected. The specimen obtained was a three-fetiform structure. Roentgenographic examination of the lesion showed the bony structure of three limbs and a vertebral axis, which distinguished the mass from a well-differentiated intraventricular teratoma.