Abstract
A 41-year-old man underwent a medical examination for close inspection and treatment because a hepatic tumor detected on abdominal ultrasound (US) during a medical check-up. The abdominal computed tomography (CT) revealed that he had a well-demarcated tumor including the structure of a multilocular cyst in the lateral segment and the medial segment of the left liver. Biliary cystadenocarcinoma or sarcoma was suspected and a left hepatectomy was performed. Immunohistochemically, the tumor was diagnosed as a solitary fibrous tumor (SFT). Histopathologically, we did not recognize nuclear atypia or mitosis, but we found partial necrosis and invasion into the bile duct wall. After nine months postoperatively, the patient is alive and well. The SFT is an unusual tumor that arises mostly in the pleura. The primary SFT in the liver is extremely rare. The majority of SFT follow a clinically benign course, but occasionally it follows a malignant course. We consider that it is necessary to carefully follow-up in the present case.
