Collision tumors are rare cases with two different tumor entities growing synchronously. While adenocarcinoma of the pancreas is the most common pancreatic tumor with an incidence of 10 per , retroperitoneal liposarcoma remains very rare. This is the first report of a collision tumor between these two tumor entities. | First reported case of a collision tumor composed of pancreatic adenocarcinoma and retroperitoneal liposarcoma A case report