腹部腫瘤的臨床表徵常隨腫瘤所在位置而異，如果表徵為多樣性，常導至鑑別困難，甚至於偏離治療方向。
　　本病例臨床上表現腰痠、左下肢水腫麻木、腹脹。病人先後至婦科及骨科求診，且分別接受手術治療。因腫瘤巨大只能部分切除或切片，最後診斷為畸胎瘤與後腹膜淋巴瘤。在住院診斷治療過程曲折，治療採同步化學放射治療，化學治療使用CHOP 組合併放射治療給于腫瘤劑量為3060 cGy。腫瘤除快速溶解、膿瘍形成外又發展.管及組織壞死性肌膜炎。文獻上所見不多，提出來報告。

Tumors originated in retroperitoneum are rare and usually the primary treatment is surgery. We report a case of double tumors, retroperitoneal lymphoma and ovarian teratoma with unusual presentation.
The patient presented with low back soreness, lower leg edema and numbness,
abdominal fullness. She was treated by the gynecologist, orthopedics and oncologist.
She was treated with CHOP regimen chemotherapy combined with radiation 3060
cGy. Rapid tumor lysis was complicated with abscess formation, fistula and necrotizing fasciitis.