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We report a case of a patient with portal hypertension secondary to alcoholic cirrhosis (Child's Class C) who initially presented with a colovaginal fistula secondary to acute sigmoid diverticulitis. The patient had a prior history of hepatic cirrhosis with ascites, coagulopathy, and portal hypertension. Computed tomography of the abdomen and pelvis demonstrated a large diverticular phlegmon and ascites. Computed tomographic angiography demonstrated a large left anterior abdominal wall varix in the region of the anticipated sigmoid resection. Three-dimensional reconstruction of the computed tomographic angiography further delineated the path of this large varix, confirming the increased risk from surgical intervention. Following initial conservative treatment with intravenous antibiotics, parenteral nutrition, and percutaneous abscess drainage, a transjugular intrahepatic portosystemic shunt procedure was performed to decompress the portal system varices. A repeat computed tomographic scan with three-dimensional reconstruction confirmed decompression of the varix. A successful sigmoid resection was subsequently performed. Preoperative computed tomographic angiography with three-dimensional reconstruction is a useful adjunct in planning the operative strategy in patients with complex intraabdominal pathology and collateral portovenous flow secondary to portal hypertension.