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

• （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。