RADIOLOGY: HEPATOBILIARY: Case# 68: HEMANGIOMA. Patient is a 60 year old male status post removal of bladder polyp by cystoscopy. A predominantly low attenuation lesion in the right hepatic lobe is noted demonstrating intense peripheral nodular enhancement. On delayed images, this lesion becomes homogeneously minimally hyperdense compared to the surrounding hepatic parenchyma. Multiple tiny low attenuation lesions in the right and left hepatic lobe are noted consistent with benign hepatic cysts. Hemangiomas are a common incidental finding on routine imaging surveys of the liver and may pose an important diagnostic problem in patients with a known primary malignancy. Hemangiomas are the most common benign tumors of the liver. They are usually found in the right hepatic lobe and are frequently subcapsular in location. The CT appearance of hemangiomas after a bolus injection of iodinated contrast material with dynamic scanning demonstrates a dense peripheral enhancement, which eccentrically fills in toward the center of the lesion on delayed scan. This is the most common finding and is seen in approximately 85% of lesions greater than 3cm in size. The angiographic appearance of a hemangioma is classic, with puddling of contrast material within the tumor, which remains visible on delayed, prolonged filming sequences. Some hemangiomas exhibit atypical features such as cystic areas probably caused by hemorrhage or thrombosis. Other lesions simply fail to show the typical pattern well enough to confirm the diagnosis.