患者是一位73歲男性病人，主訴便祕及尿瀦留有數天之久，經一系列泌尿系統及骨腸道攝影檢查後電腦斷層懷疑有前列腺腫瘤伴隨左腸骨右總股部位淋巴當腫大並漫沿至直腸前壁，患者接受經尿道前列腺切除術後，組織病理切片檢查證實為前列腺淋巴癌，本文提出一病例報告並作文獻回顧。

We present a case of malignant lymphoma of the prostate. A 73-year-old man was admitted due to constipation and urinary retention for several days. After a serious evaluation of the genitourinary and gastrointestinal tracts, CT scan showed a huge homogeneous, soft tissue mass in the right lower pelvic cavity with lymph nodes enlargement at left iliac and right common femoral regions, while indistinct margin related to the anterior wall of the rectum was noted. Transurethral resection of the prostate was performed and pathology showed diffuse large B-cell lymphoma. Literatures are also reviewed. (J Urol R.O.C., 9:21-24,1998)