单选题:继发性三叉神经痛与原发性三叉神经痛主要鉴别要点是(  )

题目内容:
继发性三叉神经痛与原发性三叉神经痛主要鉴别要点是(  ) A.触发点的存在
B.有无面部痛觉减退和角膜反射减退
C.合并有角膜炎
D.伴有牙齿疾患
E.疼痛范围小
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