Obliterative portal venopathy: findings at CT imaging.

PURPOSE: To retrospectively analyze the computed tomographic (CT) findings in a single-center series of adult patients with biopsy-proved obliterative portal venopathy (OPV) and to compare them with those observed in patients with cirrhosis. MATERIALS AND METHODS: The requirement for informed consent was waived. This institutional review board-approved study included 42 consecutive patients with a histologically proved diagnosis of OPV who underwent CT at diagnosis. The clinical characteristics at diagnosis were recorded, and CT examination results were reviewed. Two radiologists evaluated portal vein patency and intrahepatic portal branches, the morphologic changes in the liver, the presence of hepatic nodules, and signs of portal hypertension in consensus. The control group consisted of 42 patients who had histologically proved cirrhosis. CT findings were compared between the OPV patient group and the cirrhotic group and also among the conditions associated with patients with OPV. The Fisher exact test was used. P values of .05 or less were considered to indicate significant differences. RESULTS: The following CT findings were observed significantly more frequently in OPV than in cirrhosis: extrahepatic portal vein thrombosis (18 [43%] of 42 vs five [12%] of 42); intrahepatic portal abnormalities (18 [58%] of 31 vs one [2%] of 42) such as reduced caliber, occlusive thrombosis, and lack of visibility; focal nodular hyperplasia-like nodules (six [14%] of 42 vs 0 [0%] of 42); and perfusion disorders (15 [36%] of 42 vs six [14%] of 42). Conversely, the combination of hypertrophy of the caudate lobe and atrophy of segment IV (27 [64%] of 42 vs 10 [24%] of 42) and nodular surface (37 [88%] of 42 vs seven [17%] of 42) were seen significantly more often in cirrhosis. CONCLUSION: Characteristic CT findings in patients with OPV that differ from those in patients with cirrhosis were shown, the most common being the presence of intra- or extrahepatic portal abnormalities.