Purpose : To document the findings of a small arterioportal(AP) shunt on hepatic angiography through thevarious diagnostic modalities, and to determine whether this shunt is related to hepatocelluar carcinoma.Materials and Methods : During the hepatic angiography in 223 patients, a small AP shunt and subsequent focalparenchymal staining more than 1cm in diameter were found in 28 patients. We compared this angiographicabnormality using MR imaging(n=10), CTAP(n=12), iodized-oil CT(n=23), intraoperative ultrasonography(n=5) andfollow-up hepatic angiography(n=11), as well as with conventional ultrasonograp-hy and CT scan. Results :Arterioportal shunts noted on angiographic study matched with perfusion defects noted in CTAP(10/12) and also withthe area of arterial enhancement seen on dynamic CT scan(34). In no case was a lesion found on MR and no Lipiodoluptake was seen on CT. There was no evidence of tumor growth around the AP shunts on follow-up angiographies, andno tumor was found during surgery. Conclusion : A small AP shunt was not related to the presence of a tumor. Ifthe hemodynamic changes resulfing from a small AP shunt are understood, confusion can be avoided in theinterpretation of vascular imaging including CTAP and dynamic CT.