[Intra-abdominal undifferentiated high-grade pleomorphic sarcoma as the cause of mechanical bowel obstruction].

Primary intra-abdominal undifferentiated high-grade pleomorphic sarcoma is rare with only 40 cases described worldwide. We describe a case of a patient who presented with mechanical bowel obstruction with abdominal undifferentiated high-grade pleomorphic sarcoma. Five-year survival rates have been reported as low as 40-55%, especially due to late diagnosis. Rare diagnoses as in our patient emphasize the need for close collaboration between pathologists, radiologists and surgeons.