直肠齿状线上5cm处癌肿,无梗阻。导致持续性疼痛的原因是(?)A.近端肠管扩张B.癌肿侵犯骶前神经丛C.癌肿侵犯直肠黏膜神经D.继发感染

作者: rantiku 人气: - 评论: 0
问题 直肠齿状线上5cm处癌肿,无梗阻。导致持续性疼痛的原因是(?)
选项 A.近端肠管扩张 B.癌肿侵犯骶前神经丛 C.癌肿侵犯直肠黏膜神经 D.继发感染
答案 B
解析 :直肠癌早期可无症状,侵犯骶前神经可出现骶尾部剧烈持续性疼痛,因齿状线上直肠为内脏神经支配,癌肿继发感染时无明显疼痛。

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