[Transcatheter arterial embolization in patients with renal arteriovenous malformation: a report of two cases].

We report two cases of renal arteriovenous malformation (AVM) with chief complaints of macroscopic hematuria, and treated with transcatheter arterial embolization (TAE) using Gelfoam. Although hematuria disappeared after TAE in both cases, recanalization of AVM was revealed by follow-up renal arteriography one and three months later respectively. TAE were repeatedly performed at the same time. At the follow-up, the partial infarction in the normal parenchyma of the treated kidney was demonstrated on CT scanning in one case. We suggest that if the residual or recanalization of AVM after the initial TAE is observed, careful follow-up should be preferred without repeated TAE unless some deriving symptoms have appeared.