排类造影用于研究盆底疾患已30多年，对于识别直肠前膨出和直肠脱垂颇有价值，但有不能显示腹膜的局限性。因此，它难以识别肠癌，即使加上阴道造影亦可能遗漏20％以上的肠疝；不易发现诸如闭孔疝、会阴迹等罕见盆底疝；不易鉴别用力排粪时出现的直肠套餐与“正常”的粘膜皱褶 Classography for the study of pelvic floor disease has more than 30 years, for the identification of rectal prolapse and rectal prolapse quite valuable, but can not show the limitations of the peritoneum. Therefore, it is difficult to identify colorectal cancer, even with vaginal angiography may also omit more than 20% of the hernia; not easy to find, such as obturator hernia, perineal hernia and other rare pelvic hernia; difficult to identify forced defecation rectal set and rectal “ Normal ”mucous membrane folds