例1男,66岁。体检发现后腹膜占位。患者无畏寒、腹痛、腹泻,大小便正常。有高血压病史,无糖尿病病史。体检:腹平软,未及包块,无压痛、反跳痛,双肾区无叩击痛,双输尿管径路无压痛。实验室检查:未见特殊。CT平扫及增强:骶骨前方两侧髂血管之间见一直径约5 cm类圆性肿块,内见脂肪密度,境界清,增强后脂肪密度无强化,病灶实质部分轻度强化(图1～3)。手术及病理:术中见腹膜后骶骨前两侧髂总血管间一约5.0 cm×3.5 cm肿块,质地中等,有包膜,与周围境界清,紧 Example 1 male, 66 years old. Physical examination found after peritoneal occupancy. Patients without chills, abdominal pain, diarrhea, normal urine. Have a history of hypertension, no history of diabetes. Physical examination: abdominal soft, not mass, no tenderness, rebound tenderness, no percussion pain double kidney area, double ureter path without tenderness. Laboratory tests: no special. CT scan and enhancement: between the iliac vessels on both sides of the front of the sacrum to see a diameter of about 5 cm class round lumps, see the fat density, realm clear, enhanced fat density without enhancement, the lesion was slightly mild enhancement (Figure 1 ~ 3). Surgical and pathological: intraoperative see retroperitoneal sacroiliac at both sides of the common iliac blood vessels about 5.0 cm × 3.5 cm mass, medium texture, enveloped, with the surrounding realm clear, tight