患者男,25岁,以腰背部疼痛1年半,加重伴排便困难1周入院。查体:下腹部偏右侧可触及大小约10 cm×11 cm包块,质韧,活动可,无压痛,与周围分界清。直肠指诊:距肛缘5 cm处可触及外压性巨大包块,质硬,不活动,无触痛。B超:右侧盆腔内实性占位,考虑腹膜后病变。呈不均匀强化,实性部分 Male patient, 25 years old, with lumbar and back pain for 1 year and a half, aggravated with difficulty in defecation 1 week admission. Physical examination: the right side of the lower abdomen can reach the size of about 10 cm × 11 cm mass, quality and toughness, activity can be, no tenderness, and surrounding demarcation clear. Rectal diagnosis: 5 cm away from the anal verge can reach the huge mass of external pressure, hard, inactive, no tenderness. B-ultrasound: solid pelvic right occupying place, consider retroperitoneal lesions. Inhomogeneous enhancement, solid part