肺硅沉着症早期病变表现在A.两肺上叶B.两肺下叶C.左肺中叶D.肺门淋巴结E.胸膜

作者: rantiku 人气: - 评论: 0
问题 肺硅沉着症早期病变表现在
选项 A.两肺上叶 B.两肺下叶 C.左肺中叶 D.肺门淋巴结 E.胸膜
答案 D
解析 :硅尘进入肺泡后,被巨噬细胞吞噬,然后进入淋巴系统到达肺门淋巴结。首先引起肺门淋巴结的纤维组织增生,形成硅结节。随着尘细胞的不断堆积,造成淋巴管的阻塞及淋巴液的淤滞,逆流至胸膜下淋巴管,从而引起肺泡间隔和血管、支气管周围尘细胞聚集,发生纤维化,产生硅结节。
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