患者、男、53岁,以“发现下腹部肿物2个月”就诊,无寒热.无腹泻.体检:心肺(一).腹平坦,于下腹部可扪及一大小约7×8×8cm肿物,质实,活动差.血、原常规(-).B超检查:盆腔扫查示紧靠膀胱后方可见一大小约12×8×9cm肿物,境界清楚,周边尚光整,内部回声较紊乱,呈不均中底回声.并见散在液性暗区(如图1).B超诊断:腹膜后肿瘤(性质待查).手术所见:在盆腔腹膜后可见一实性肿物,大小与B超所测相似,肿物一周边有粘连.术后病理诊断:腹膜后黄色肉芽肿.讨论:黄色肉芽肿是一种组织细胞源性肿瘤,可见于各种年龄段,但通常见于40岁以上的人,男 The patient, male, 53 years old, treated with “found 2 months of lower abdominal mass” without cold or heat. No diarrhea. Physical examination: cardiopulmonary (I). Abdomen flat, with a size of about 7×8×8cm in the lower abdomen. Tumors, quality, poor activity. Blood, the original routine (-). B-ultrasound: pelvic scan shows a size of about 12 × 8 × 9cm tumor immediately behind the bladder, the realm is clear, the surrounding is still the whole, internal Echoes are more disordered, with uneven midsole echoes. See also scattered in dark areas (Figure 1). B-diagnosis: retroperitoneal tumor (property to be investigated). Seen from surgery: A solid swollen peritoneum can be seen behind the pelvic cavity. The size and size of the material are similar to those measured by B ultrasound. There is adhesion around the tumor. Postoperative pathological diagnosis: retroperitoneal granuloma. Discussion: Xanthogranuloma is a histiocytic cell-derived tumor seen in various age groups. Usually seen in people over 40 years old, male