Thirteen cases showed abnormal IBS ( 36 11%). The abnormal X ray features of anorectal angle and pelvic floor descent included rectocele, rectal mucosal prolapse, splanchnoptosis, perineum descent and spastic pelvic floor syndrome. 结果排粪造影阳性的例数为13例(3611%),排便过程中的异常有多种,包括直肠前突、直肠粘膜脱垂、内脏下垂、会阴下降和盆底痉挛综合征等。