患者,女,43岁。腹胀、便秘6个月, 低热3个月。查体:腹软无压痛,肠鸣音活跃。结肠造影示回盲部充盈缺损。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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