Solitary Fibrous Tumor of the Liver

Abstract

A rare case of solitary fibrous tumor (SFT) of the liver is described. The patient was a 49-year-old man who had a 17x12xlO cm mass (2,750 g) with a firm and vaguely whorled cut surface, a scar-like central area, and pushing rather than infiltrating borders. It was located in the subcapsular parenchyma of the left lobe. The histologic, immunohistochemical, and ultrastructural features are identical to those seen in the more common SFTs of the pleura. Those features include a variable spindle cell proliferation, scant mitotic activity, immunoreactivity for CD34 and vimentin, and the absence of necrosis. The patient underwent a partial hepatectomy and the surgical margins were free of tumor. No recurrence was detected 15 months after excision. This case adds to 12 similar previously reported cases involving the liver. A review of the literature indicates that SFT of the liver behaves in a benign fashion.