A solitary fibrous tumor originating from the liver surface.

The case was a 30-year-old woman found to have a 7-cm mass around the pancreatic head during a company health examination. No abnormal values other than anemia were observed in the physical findings, blood exam, and various tumor markers at the initial visit. An abdominal computed tomography (CT) revealed a tumor, 6.5 cm in diameter, accompanying a hypervascular cystic lesion in contact with the dorsolateral side of the descending portion of the duodenum and showed a dense stain in the early phase. Abdominal magnetic resonance imaging (MRI) demonstrated a lesion of isosignal intensity in a T1-weighted image and of slightly high signal intensity in a T2-weighted image. Endoscopy identified no mucosal lesion and endoscopic ultrasonography (EUS) showed an unclear border with the liver. The laparoscopic findings revealed a multilocular, elastic tumor that was prone to bleeding within the abdominal cavity. The tumor was resected immediately, as it was in contact with multiple organs but continuous with the Glisson's capsule in the posterior portion of the liver. The tumor was positive for CD34/Bcl-2 and negative for S100 protein/c-kit/EMA, therefore a diagnosis of solitary fibrous tumor (SFT) was made. The postoperative course has been favorable. The patient was discharged on day 10 and her course is currently being monitored on an outpatient basis. SFTs are relatively uncommon as extrathoracic lesions, and those originating from the liver surface are extremely rare.