Abstract
A 72-year-old female was referred to us because she was found to have an intrapelvic tumor on the occasion of an examination for other diseases. Abdominal and pelvic computed tomography (CT) scan showed a 45 mm solid, hypervascular tumor on the left side of the pelvic cavity. We suspected a hypervascular mesenchymal tumor and we planned to resect the tumor for diagnosis and treatment. The patient was treated with transcatheter arterial embolization (TAE) 2 days before the operation to reduce intraoperative blood loss. We were able to resect the tumor completely with 420 g of blood loss. Histological findings revealed that the tumor was composed of a cellular proliferation of spindle cells without a specific arrangement and an interposition of collagen fibers to the stroma. Immunohistochemical staining was positive for CD34. We diagnosed the tumor as solitary fibrous tumor (SFT). SFT is a rare mesenchymal tumor derived from the connective tissue under mesothelium. SFT in the pelvic cavity is even rarer. The effectiveness of preoperative TAE for SFT in the pelvic cavity is not established yet, but it should be considered as an option because of this positive experience.
