The treatment of choice in retroperitoneal liposarcoma is curative RO resec
tion. However, there are high rates of reoperation due to recurrence. Our p
resent case report shows difficulties in detecting recurrence due to atypic
al configuration. Eventually a huge diverticulum of the duodenum combined w
ith leiomyoma in its neck area was histopathologically identified as a recu
rrent liposarcoma.