A giant solitary fibrous tumor of the mesentery: Case report

Introduction: Solitary fibrous tumor is a rare neoplasm of mesenchymal origin that typically arises from pleura. Mesentery origin is an extremely rare presentation. Although benign in most cases, surgery with en bloc resection of the tumor is the treatment modality due to the possibility of malignancy and allows a final histopathological and immunohistochemical diagnosis. Case Report: We report a case of a giant solitary fibrous tumor of the mesentery of the small intestine in a 74-year-old patient who was referred to our hospital for an intermittent and vague abdominal pain. Physical examination revealed a dolorous and immobile mass palpable on right lower quadrant which was initially thought to be a gastrointestinal stromal tumor (GIST). The mass was successfully resected and the diagnosis of a solitary fibrous tumor was confirmed on immunohistochemical analysis. The patient was discharged 4 days after surgery and had an uneventful clinical course throughout the 12-month postoperative follow-up. Conclusion: We present an uncommon localization of a solitary fibrous tumor, arising from the small bowel mesentery and with a large dimension. Since solitary fibrous tumor may show aggressive behavior with frequent local recurrence, careful long-term follow-up has been recommended for the rare cases of extrapleural solitary fibrous tumor.