Huge retroperitoneal dedifferentiated liposarcoma presented as acute pancreatitis: report of a case.

[dedifferentiated liposarcoma]

A 74 -year -old male with abdominal pain was admitted to the emergency room in our hospital . The high value of serum amylase was shown in his blood test . The postcontrast computed tomography (CT ) showed the huge retroperitoneal tumor with a thin -walled mass occupying most of the part of the right retroperitoneal space . The tumor spread into the soft tissues around the pancreas ; as a result , the duodenum was compressed and the pancreas was displaced to the right side . The irregular pancreatic outline , obliterated peripancreatic fatty tissue and fluid in the left anterior pararenal space were revealed , so acute pancreatitis was diagnosed . The diagnostic biopsy of retroperitoneal tumor was done , and the pathological findings of retroperitoneal mass revealed dedifferentiated liposarcoma . The medical treatment against acute pancreatitis was performed firstly . After the patient recovered from that , the surgical resection of the tumor with the right kidney and right adrenal gland was completed successfully . The patient remained well , without any evidence of recurrence three months after surgery . However , the histology showed dedifferentiated liposarcoma ; therefore , postoperative regular examination is necessary .