Abstract
A 46-year-old woman, visited our hospital because she had been incidentally diagnosed with a tumor. CT scan revealed that the tumor was surrounded by the duodenum, inferior vena cava, and right kidney. Enhanced CT showed tumor staining in the delayed phase. As we could not make a detailed qualitative diagnosis, we decided to resect the tumor to enable a definitive diagnosis. The tumor occupied a 5-cm space in the retroperitoneal cavity and appeared to be a hemangioma fed by the right ovarian artery. On histopathology, the tumor was diagnosed as a cavernous hemangioma. Retroperitoneal cavernous hemangioma typically exhibits hypovascular staining, and thus, it is often difficult to diagnose because of its rarity. Reported cases are limited in Japan ; in most cases, surgery is performed without preoperative diagnosis. Cavernous hemangioma should be considered in the differential diagnosis of a hypovascular retroperitoneal tumor.
