Multisurgical approach for recurrent fetus-in-fetu of the skull

Abstract Foetus in fetu is a rare tumor of the child. CT and/or MRI suggest this diagnosis. Differential diagnosis with mature multicellular teratoma can be difficult. Here we reported the case of a girl born at 37 weeks, that presented a voluminous mastoïd mass on the left side treatment by initially by surgery. Until age of 9 years, she developed a tumor recurrence localized at the skull base near the left cerebello ponting angle requiring a neurosurgical approach with a good following. The pathology was finally a teratoma. Total removal must be a goal of the initial surgical treatment but a long term follow up is mandatory to avoid recurrence.