女,25岁,低热、便秘腹泻交替3年,查体:右下腹4cm×4cm肿块,质中等,较固定,轻压痛。为明确诊断,最有诊断意义的检查是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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