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76岁男性,肚脐右侧皮疹5年,无不适感。皮损长期不消退,外用皮炎平、达克宁等无效,且逐渐扩大。查体:肚脐右侧一个3cm×4cm大小的暗红色斑块,表面角化明显。皮损境界清楚,边缘不规则,呈花瓣状。该皮损的组织病理中最具有诊断意义的是A、表皮细胞排列紊乱,有核非典型性
B、棘层肥厚
C、角化不良
D、真皮浅层带状淋巴细胞浸润
E、角化亢进
临床首先考虑A、汗孔角化症
B、鲍温病
C、慢性皮炎
D、银屑病
E、皮肤结核
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