Rectal arterio-portal fistula: An unusual cause of persistent bleeding per rectum following a proximal spleno-renal shunt

Figure 1 Computed tomography angiography image (post processed with volume rendering technique) showing rectal arterio-portal fistula draining into dilated superior rectal vein (arrow).

Figure 2 Pelvic angiography image showing the rectal arterio-portal fistula draining into the dilated superior rectal vein (arrow).

Figure 3 Post embolization angiogram from the anterior branch of the right internal iliac artery (arrow) showing obliteration of blood flow in the arterioportal fistula.