Solitary Small Hepatic Angiosarcoma: Initial and Follow-up Imaging Findings

Primary hepatic angiosarcoma is a very rare tumor. Koyama et al. classified hepatic angiosarcomas into 4 types: multiple small nodules, a large dominant mass, large focal lesion and diffuse infiltrating lesions. Most reported cases are of the first 2 types and a few areas of each tumor are of the latter 2 types. To our best knowledge, a solitary small (≤ 20 mm) hepatic angiosarcoma has not previously been reported in the radiology literature. We report here on a solitary, small hepatic angiosarcoma, and we include the initial and follow-up CT and MR findings. In summary, we report here on a case of a solitary, small hepatic angiosarcoma that was detected on the initial CT and follow-up MRI. If the enhancement pattern of the hepatic mass resembles a hemangioma, but it is slightly different from that of the typical hemangiomas, even if it is small lesion, then follow-up imaging studies should be performed. Heterogeneous signal intensities and centrally septal-like progressive enhancement on the MR images could be findings that are suggestive of hepatic angiosarcoma