男,54岁,反复脓血便半年,每天3~4次,在当地曾按"痢疾"治疗无明显效果。近一月出现腹胀,伴阵发性腹痛。查体:消瘦,腹稍胀,软,下腹轻压痛,右下腹可扪及一肿块,质较硬,尚可活动。首选的辅助检查()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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