患者男,47岁。尿频、排尿、大便不畅1年余,近来逐渐加重就诊。直肠指诊:触及巨大包块,质硬。B超检查:盆腔见一10cm×10cm大小实性低回声包块。实验室检查未见异常。CT检查:平扫及增强示盆腔骶前大小约11cm×11cm类圆形软组织块,密度均匀,边缘清楚,强化均匀,伸入骶孔内,局部骶骨 Male patient, 47 years old. Frequent urination, urination, poor stool more than 1 year, recently gradually increased treatment. Rectal diagnosis: touch a huge mass, hard. B-ultrasound: pelvic see a 10cm × 10cm size solid hypoechoic mass. Laboratory tests showed no abnormalities. CT examination: plain and enhanced showed pelvic presacral size of about 11cm × 11cm class round soft tissue mass, uniform density, clear edge, enhanced uniform, into the sacral hole, the local sacrum