正常的肺，横截面（大体）
2010-06-02 16:24:15   来源：   评论：0

02.This is a cross-section of normal lung (with only minimal posterior congestion at the lower right). The hilar lymph nodes are small and have enough anthracotic pigment (from dusts in the air breathed in, scavenged by pulmonary macrophages, transferred to lymphatics, and collected in lymph nodes) to make them appear greyish-black.