经腹会阴直肠癌根治术后腹腔脏器和组织经盆腔底部腹膜缝合裂开处凸入骶前间隙，称经腹会阴直肠癌根治术后盆底腹膜疝(peritoneal hernia of pelvic floor caused by miles operation)，亦称经腹会阴直肠癌根治术后盆底疝(hernia of pelvic floor caused by miles operation)。临床上少见，多发生在腹会阴直肠癌根治术后早期，于腹压增加或抽取止血纱布时肠管脱出。术后晚期则表现为会阴部可复性包块。