患者女性,36岁,间断发作下腹部疼痛伴腹泻2年,每天排便3~4次,为脓血便,常有里急后重,排便后疼痛缓解。该患者最可能的诊断是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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