FIG 1. Imaging studies in a 31-year-old man (case 2) with a cortical hematoma in the left angular and supramarginal gyri.

A and B, At admission, lateral early (A) and late (B) arterial-phase angiograms of left internal carotid artery do not show evidence of arteriovenous shunting.

C, Oblique left internal carotid arterial-phase angiogram obtained 1 month later, after hemorrhage resorption, shows early venous filling of two cortical veins that drain in the superior sagittal sinus (arrows and arrowheads).

D, Subsequent superselective exploration of the angular branch of the left middle cerebral artery reveals the feeder, the nidus, and the double superficial venous drainage of the micro-AVM. After stable microcatheter positioning, treatment of the lesion was performed by using a single injection (ie, single shot) of a polymerizing agent.