The septa appear smooth in contour (Figure 3); no distinct nodules are visible within them. Slight variation in thickness of the septa may reflect the presence of pulmonary veins.

• （增厚的小叶）间隔边缘平滑，未见明显的结节状改变。增厚的小叶间隔局部轻微厚度改变提示为肺静脉所在。