[A case of arteriovenous malformation showed onset of symptoms on the late neonatal period].

Arteriovenous malformation ruptured in the neonatal period is rare. The authors report a case of arteriovenous malformation showed onset of symptoms on the late neonatal period. A female Japanese baby was born at full term. Neonatal history was uneventful until she had bad temper, pallor and vomiting on 23th day. Her head size increased abnormally until it was 42.5 cm when she was admitted to Shizuoka Children's Hospital with a diagnosis of possible hydrocephalus at 2 months old. CT scan showed a large cystic cavity communicated with the dilated lateral ventricles. The ventriculo-peritoneal shunt was performed, but unfortunately the shunt was removed for the suspicion of abdominal complication. At the age of 4 months, right retrograde brachial angiography showed a tangle of abnormal vascular channels in the right fronto-lateral basal region (15X13X8 mm in size), which was fed a frontopolar artery and drained to superior saggital sinus. Frontal osteoplastic craniotomy was performed and total arteriovenous malformation with a partial frontal lobe was excised. Ventriculo-peritoneal shunt was reinserted for the post-hemorrhagic hydrocephalus. She was healthy on 3 years old with mild motor deficit.