患者,女性,42岁,3d前感肛门内胀痛,今日出现畏寒,乏力,排尿困难,直肠指检见肛管右侧有触痛性隆起,具有波动感,考虑是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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