Background: Soft-tissue sarcomas may develop in the
retroperitoneal space, in the peritoneal cavity and in the
lower extremities. They are rare tumors, and make up
1% of all adult malignancies. Complete resection of the
tumor is of crucial importance to achieve a long-term
survival. Multivisceral resections are required in the majority
of cases. Mucinous cystadenoma of the appendix
is an uncommon condition, too. Most of the patients
with mucinous cystadenoma present with clinical symptoms
of acute appendicitis. The diagnosis is usually
made postoperatively by histopathological examination.
Case Report: We here present a rare co-existence of a
retroperitoneal liposarcoma and an appendiceal mucinous
cystadenoma. Conclusion: En bloc resection of
retroperitoneal soft-tissue sarcomas also provides removal
of invaded adjacent organs with any co-existing
disease.