Intra-abdominal Rupture of Undifferentiated Pleomorphic Sarcoma —A Case Report—

Abstract

Undifferentiated pleomorphic sarcoma (UPS) is a highly aggressive malignancy, and intra-abdominal rupture of UPS is extremely rare. We report an adult patient with ruptured UPS who survived more than five years after repeated resections. A 42-year-old man was brought to the emergency department because of a one-month history of abdominal bloating followed by abdominal pain. Contrast CT revealed a huge mass on the right side of the abdomen, and MRI findings suggested intra-tumoral hemorrhage. Because progressive anemia was also observed, resection of the tumor was performed urgently. The patient was then temporarily discharged. Pathological examination diagnosed the patient with UPS. Four months later, an outpatient examination revealed a recurrence of UPS, and resection of the recurrent tumor was performed. UPS subsequently recurred twice, and each time resection was performed. Five years after the initial surgery, the patient is currently alive. Intra-abdominal rupture of UPS is uncommon and can cause early recurrence, but multiple resections and intensive follow-up can contribute to long-term survival.