正常人的甲弧影是白色的。甲弧影变红见于许多疾病,本文作者对4例有红色甲弧影的患者进行了临床和组织病理学检查。例1、2、4均患有慢性阻塞性肺病,例3为药物性SLE;例2、3有长期服用皮质激素史,而例1、4则无类似治疗史。例1、3有成人非胰岛素依赖性的糖尿病。例1、2有酗酒史,例1、2、4均有慢性阻塞性肺病, Normal arc shadow is white. Arc-arc reddening seen in many diseases, the authors of 4 patients with red arc-shadow in patients with clinical and histopathological examination. Cases 1, 2 and 4 were all suffering from COPD. Case 3 was drug-induced SLE. Cases 2 and 3 had a long history of taking corticosteroids, while cases 1 and 4 had no history of similar treatment. Cases 1 and 3 have adult non-insulin-dependent diabetes mellitus. Cases 1,2 alcoholism history, cases 1,2,4 have chronic obstructive pulmonary disease,