後腹腔肉瘤在臨床上並不常見，通常到腫瘤體積很大時被接到或壓迫附近組織產生症狀而發現。本篇介紹一位以發燒不適的感冒症狀呈現的病患，並回顧文獻，對少見的後腹腔脂肉瘤做通盤的整理，引導較新的治療策略。為了能及早診斷，在少數上呼吸道感染症狀伴隨腹部腫塊的病人，後腹腔脂肉瘤須納入其鐘別診斷。

Retroperitoneal liposarcomas are uncommon. They typically produce few symptoms until they become sufficiently large to be incidentally discovered or compress surrounding structures. Herein, we report a case ofretroperitoneal liposarcomas that clinically presented as flu-like symptoms and review relevant literature to introduce the current treatment. Recognizing this rare form of presentation is crucial to diagnosing liposarcomas early and should be considered in the differential diagnosis of acute upper respiratory infection when a palpable abdominal mass is present.