[A Case of Solitary Fibrous Tumor of the Liver].

Most solitary fibrous tumors(SFT)occur in the thoracic cavity and reports on liver SFT are very rare. We encountered a case of SFT of the liver, and thus, decided to report it with a review of literature. A 70-year-old man was informed of a liver tumor by his previous doctor and referred to us for further examination and treatment. Contrast-enhanced CT revealed a 3.5 cm cyst in the S2/3 of the liver and a 3.2 cm tumor with an early staining within the cyst. Laparoscopic lateral segmentectomy was performed and a diagnosis of hepatic cystic adenocarcinoma was made. Macroscopically, the tumor was white and welldefined. Histopathological examination revealed round chromatin-enriched tumor cells proliferated with round fibrillar cells or intercalated structures consisting of round or short spindle-shaped cells. Immunohistochemistry yielded negative results for CAM5.2, HepPar1, CD31, CD99, SMA, and HMB45 but positive results for CD34, Factor Ⅷ, Bcl-2, and STAT6; therefore, the patient was further diagnosed with liver SFT. Although liver SFT is rare, it was considered a differential diagnosis when multiple bloody liver tumors were detected. In addition, since there were reports of recurrence, careful follow-up in future, was deemed necessary.