Clinicopathological characteristics and experience in the treatment of giant retroperitoneal liposarcoma: A case report and review of the literature.

Retroperitoneal liposarcoma (RPLS) is a rare tumor, especailly those over 20 kg that are called "giant liposarcoma," whose characteristics and treatments remain relatively unknown. Herein, we report a giant RPLS measuring 65 × 45 × 30 cm in diameter and 31 kg in weight, which we successfully performed complete excision through interdisciplinary cooperation. The patient had an uneventful postoperative course and was discharged without complications. Afterwards he underwent radiotherapy and had no evidence of tumor recurrence or symptoms of metastasis at 3-month CT scan and 8-month follow-up. We also first review the 13 cases reported in literature published in PubMed regarding giant RPLS. Giant RPLS commonly occurs in adults aged 40-60 y and presents atypical clinical manifestations. CT scan is the most useful examination and preoperative biopsy is controversial. Complete surgical resection still remains the principal treatment. Giant RPLS can also be removed, even reach to R0 excision, by a multidisciplinary team in a specialized center after meticulous planning even though its gigantic tumor size. Local radiotherapy following surgery may improve the rate of recurrence. Besides, closely follow-up and routine examinations are required.