Posterior fossa surgery in the sitting position in a pregnant patient withcerebellopontine angle meningioma

Primary brain tumours and pregnancy rarely occur together; meningioma and p regnancy is rarer still. We describe a 30-yr-old woman in the 25th week of pregnancy who underwent surgery in the sitting position for a large cerebel lopontine angle meningioma that was compressing and displacing the pens and medulla. The surgical procedure and postoperative period were uneventful. This case demonstrates that when absolutely necessary, anaesthesia and neur osurgery for posterior fossa lesions can be successful during the second tr imester of pregnancy. Furthermore, if indicated and if the operating team i s experienced, the operation can be performed safely with the patient in th e classical sitting position. it is emphasized that continuous and attentiv e monitoring of the mother and fetus are essential.