Fig. 1

Computed tomography, ultrasound and doppler of left renal AVM (A) Unenhanced CT in coronal reconstruction showing spontaneous hyperdensities in the superior calyx and renal pelvis of the left kidney, corresponding to clotting (black arrows), with dilatation of the left upper urinary tract B, C & D Contrast-enhanced CT at the cortical phase in coronal (B), coronal MIP 15mm and axial MIP 20mm showing the left renal AVM (orange arrowhead) with several arterial feeders. Axial MIP reconstruction shows the liver involvement of HHT with hepatic artery > 6mm and distal subscapular telangiectases E Contrast–enhanced CT at the excretory phase showing a delay in urinary excretion due to blood clots, obstructing the left upper urinary tract F & G—B mode ultrasound (F) and doppler (G) showing left renal AVM as an hypoechoic, well-marginated lesion, close to the sinus (orange arrowhead). Arterial feeders are seen on doppler examination H – Pulsed doppler in an arterial feeder of the AVM showing reduced resistance index (IR = 0,39) with increased tele-diastolic velocity (TDV≈29cm/sec)