患者,女,40岁,习惯性便秘3年,经常排便困难,3〜5天排一次便,干燥呈羊粪状,近半年来出现便后抉状物突出,便后消失,有时便后有鲜血滴出,可能的诊断是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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