A 41-year-old woman was hospitalized because of gross hematuria. She was found to have a renal arteriovenous malformation and was treated with transcatheter arterial embolization (TAE). Renal scintigraphy with Tc-99m mercaptoacetyltriglycine was performed before and after TAE. Renal scintigraphy was useful for evaluating renal function in this patient.