Angiosarcoma-like metastatic carcinoma of the liver.

Two cases of metastatic carcinoma strikingly simulating angiosarcoma in the liver are described. The first case was a 53-year-old female with cystic liver tumors which were found 22 months after surgery for ureteral cancer. The second case was an 81-year-old female with multiple tumors in the liver and the pancreas, and a post-mortem examination was carried out. She had undergone surgery for skin cancer three years before. Both cases had an angiosarcoma-like appearance macroscopically and microscopically. Immunohistochemically, the tumor cells of both cases were negative for CD31, CD34, and Factor VIII-related antigen and positive for several types of cytokeratin, suggesting that they were not angiosarcomas but carcinomas. Angiosarcoma is the most common sarcoma arising in the liver. Thus, metastatic carcinoma, which resembles angiosarcoma, might be mistaken for angiosarcoma.