[A Case of Dedifferentiated Retroperitoneal Liposarcoma That Survived Long-Term after Eight Surgeries]

The case was a 68-year-old woman who presented with a complaint of an abdominal mass. She was diagnosed with the retroperitoneal liposarcoma. In the initial surgery, the primary tumor was resected together with the right colon involved. Since the histological type was the dedifferentiated type, imaging tests were performed every 10 weeks. After all there were seven local recurrences and one recurrence of lung metastasis, and each time the tumor relapsed, a combined resection of surrounding organs were repeated. At the time of the eighth recurrence, she requested chemotherapy. But her illness progressed. Five and a half years after the initial surgery, she passed away. The only effective treatment for retroperitoneal liposarcoma is surgical resection, but the prognosis varies depending on the histological type. The dedifferentiated type is a disease that often has a poor prognosis due to repeated local recurrence and inoperability. In this case, we report with a literature review on a case in which we were able to detect a recurrence in a state that was resectable by performing imaging tests at short intervals for dedifferentiated liposarcoma, and we were able to achieve long-term survival through 8 surgeries.