[Two cases of retroperitoneal liposarcoma].

[well-differentiated liposarcoma]

We report 2 cases of retroperitoneal liposarcoma . Case 1 : A 53 -year -old woman with severe abdominal distension and dyspnea was admitted to our hospital . Abdominal computed tomography (CT ) and magnetic resonance imaging (MRI ) revealed a large mass that occupied almost the entire abdominal cavity . She underwent surgery under the diagnosis of retroperitoneal liposarcoma . The tumor originated from the left lower pelvis . The tumor weighed 18 kg , and the histopathological diagnosis was well-differentiated liposarcoma . Seven years after the operation , local recurrence was found without any complaints . The operation was performed again . The tumor weighed 750 g , and it originated from the same area as observed in the first operation . The histopathological diagnosis was well-differentiated liposarcoma . Case 2 : An 82 -year -old woman complained of abdominal distension . A new dumbbell-like solid tumor was identified as retroperitoneal liposarcoma by CT and MRI findings , and it was growing rapidly . The tumor was removed with the cecum and right kidney in a curative operation . The tumor weighed 2 .6 kg , and the histopathological diagnosis was dedifferentiated liposarcoma . The best treatment for retroperitoneal liposarcoma is curative resection . However , dedifferentiation occasionally occurs over time and in recurrent cases . It is important to follow-up strictly for retroperitoneal liposarcoma .