Huge renal arteriovenous malformation mimicking simple parapelvic cyst

The presenting symptoms of renal arteriovenous malformations are usually gr oss hematuria and hypertension. Herein we present an unusual case of huge r enal arteriovenous malformation without these signs, but with ultrasound pi cture mimicking simple parapelvic cyst. Other imaging test, including Duple x ultrasound, computerized tomography and aortography, demonstrated that va scular lesion. We suggest that Duplex ultrasound should accompany the routi ne renal ultrasound in order not to miss such cases, especially when the ph ysical examination suggests intra-abdominal vascular lesion or bleeding. (C ) 2000 Elsevier Science Inc. All rights reserved.