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当前学科：中医肛肠(医学高级)
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男性，25岁，肛门胀痛，排尿困难5天。畏寒，高热，肛门外观无异常，直肠指检：肛管左侧局限性隆起，压痛明显，可诊断为（）
A . 骨盆直肠间隙脓肿
B . 肠后间隙脓肿
C . 坐骨肛管间隙脓肿
D . 前列腺脓肿
E . 直肠粘膜下脓肿
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