後頭蓋窩開頭術後に出現した二次性前頭蓋窩硬膜動静脈瘻の1例

A Case of Secondary Anterior Fossa Dural Arteriovenous Fistula Following Posterior Fossa Craniotomy

Ⅰ．はじめに

　硬膜動静脈瘻（dural arteriovenous fistula, dural AVF）は，成人例では原因不明の後天的疾患で，硬膜上に動脈と静脈の瘻が形成されるといわれている¹⁴⁾．

　また，外傷後や他の頭蓋内疾患，あるいはその治療後に二次的にdural AVFが生じることもある^2,8,9)．

　今回われわれは，開頭術後に手術部位とは異なる遠隔部位に新生したdural AVFの1例を経験したので，文献的考察とともに報告する．

The etiology of dural arteriovenous fistula (AVF) remains uncertain. The authors present a case presenting with anterior fossa dural AVF,which developed after the resection of cerebellar arteriovenous malformation (AVM). The anterior fossa dural AVF,which was not observed on the preoperative angiography,was diagnosed on the follow-up angiography,after the resection of cerebellar AVM. A mechanism underlying the present case is not clearly understood. To the best of our knowledge,some cases of dural AVF secondary to craniotomy have been reported. It is postulated that intracranial vascular anomaly should be analyzed after the surgery.