[Clinical characteristics of abdominal solitary fibrous tumor: an analysis of 18 cases].

To summarize the clinical manifestations, pathological features, diagnosis, and treatment of abdominal solitary fibrous tumor (SFT). The data of clinical manifestations, pathological features, diagnosis, and treatment of 18 patients with abdominal SFT admitted to Department of General Surgery, Peking Union Medical College Hospital between January 2000 and December 2016 were retrospectively reviewed. Abdominal mass was first presented in 14 patients. The blood routine, liver, kidney, and coagulation function were normal in all the patients. Tumor markers were abnormal in 4 cases. Most SFT showed hypoechoic mass with regular shape under ultrasound. CT findings differed among the cases. All the 18 patients underwent surgical treatment, and the diagnosis was proved by the postoperative histopathology. SFT differed in general morphology. The positive rate of Ki-67, smooth muscle actin (SMA), CD34, and S-100 was high under immunohistochemistry. Early diagnosis of abdominal SFT is difficult, leading to a low preoperative diagnosis rate. Complete removal of the tumor is the only reliable method of radical treatment.