Peritoneal Leiomyosarcomatosis Originating from Gastrointestinal Leiomyosarcomas: CT Features

PURPOSE: To evaluate the computed tomographic (CT) features of peritoneal leiomyosarcomatosis (PL) originating from gastrointestinal leiomyosarcoma and compare the CT features of primary gastrointestinal leiomyosarcomas between patients with and those without PL. MATERIALS AND METHODS: The authors reviewed the medical and surgical-pathology records and the CT scans of 89 patients with gastrointestinal leiomyosarcoma to determine the prevalence of PL. Also, the CT scans of the patients with PL were evaluated for the morphologic appearance of peritoneal lesions. The CT features of the primary tumors were compared between the patients with and those without PL. Student t and Fisher exact tests were performed. RESULTS: Metastases were present in 39 patients. PL was seen in 25 patients. Other metastatic sites included liver in 26 patients, lymph nodes in 11, lungs in three, and bone in one. In the 25 patients with PL, CT findings included multiple discrete peritoneal nodules in 22 patients and massive peritone...