Dural arteriovenous malformations in the anterior cranial fossa.

Two cases of dural arteriovenous malformation (DAVM) fed by the anterior ethmoidal artery in the anterior cranial fossa are reported, one of them examined by magnet resonance imaging (MRI). Only one other case with MRI findings so far has been published. Fourty-eight previously reported cases are reviewed. One of our patients presented with subdural haematoma (SDH) without subarachnoid or intracerebral haemorrhage. The other patient had a nasal bleed without any neurological manifestations. In comparison with previously reported cases, the clinical manifestation of our cases is infrequent (1 patient with nasal bleed, and 2 patients with pure SDH that is 2 and 4%, respectively, in the literature). Feeder was the anterior ethmoidal artery either unilateral or bilateral. Drainage of DAVMs was through a markedly dilated vascular sac into the superior sagittal sinus (SSS). The high incidence of haemorrhage from DAVM in the anterior fossa is related to this vascular sac. Magnetic resonance imaging (MRI) showed a flow void area in the left frontal region on T 1-weighted images in one case. These cases were treated by surgical excision of the malformation with good results. Aetiology, clinical presentation, and treatment of these rare DAVMs in the anterior cranial fossa is discussed.