男性,25岁,腹泻5年,2次/日,伴里急后重感,偶有便血,无发热,粪细菌培养阴性。肠镜检查:乙状结肠血管纹理不清,黏膜颗粒状,轻触易出血。下列可能的诊断是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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