Angiosarcoma of the spleen clinically presenting as metastatic ovarian cancer. A case report and review of the literature.

Primary angiosarcomas of the spleen are rare and almost always fatal. With no more than 200 cases reported in the literature worldwide, no specific risk factors are strongly associated with the disease. The mean age of patients at presentation is 59 years and the major clinical findings include abdominal pain, splenic rupture, and splenomegaly. Grossly, this neoplasm appears as hemorrhagic and/or cystic nodules, with a low-density signal seen on computed tomographic scans. Histologically, the tumor is characterized by neoplastic proliferation with diffuse or focal areas of a vasoformative component with cavernous and arborizing channels. The vascular spaces are lined by endothelial cells with variable degree of atypia. The differential diagnosis includes a variety of benign and malignant vascular proliferations (littoral cell angioma and Kaposi's sarcoma) as well as metastatic tumors. The worst prognostic factor is splenic rupture with early metastasis. The liver is the most common site. We report a case of the 43-year-old woman with a long-standing history of recurrent ovarian carcinoma treated with surgery and multiple courses of radiation therapy and chemotherapy who clinically appeared to have a metastatic ovarian cancer to the spleen and treated with partial resection of stomach and splenectomy. However, histopathologic examination of the specimen showed the tumor to be of a primary angiosarcoma. We believe that the lengthy exposure to radiation may have played a role in the histopathogenesis of this neoplasm in this patient.