Figure 6c. Angiosarcoma. (a) Contrast-enhanced CT scan shows a mass with soft-tissue attenuation and punctate calcifications. Enhancement is intense peripherally, and the center of the lesion appears necrotic. There is an associated intrahepatic hematoma (*) due to local hemorrhage from the tumor. (b) Coronal FLASH two-dimensional gradient-echo T1-weighted MR image (690/12) obtained after injection of contrast material shows intense peripheral enhancement, which reveals the necrotic center. The adjacent hematoma appears as a cystic lesion. (c) Photograph of the gross specimen shows a bulky, irregular mass with internal vascular lakes. (d) Photomicrograph (original magnification, x10; hematoxylin-eosin stain) shows vascular clefts (*) lined with one or more layers of tumor cells.