Primary Pancreatic Leiomyosarcoma: A Rare Malignant Transformation of Primary Pancreatic Head Leiomyoma.

Primary pancreatic leiomyosarcoma and primary pancreatic leiomyoma are rare tumors of the pancreas. Primary pancreatic leiomyoma is a benign tumor and its conversion to leiomyosarcoma has never been reported. We report a case of malignant transformation of pancreatic leiomyoma. In this case, a 75-year-old male, who presented with a mass in the head of the pancreas, was diagnosed with primary pancreatic leiomyoma. The patient maintained well on symptomatic treatment for 13 years. However, later the patient presented with loss of appetite, significant weight loss, and an abdominal lump, which was diagnosed to be locally advanced primary pancreatic leiomyosarcoma. The patient was provided the best supportive care and died after 11 months of diagnosis. Hence, we conclude that a more radical treatment approach is needed in patients with primary pancreatic leiomyoma.