Figure 70A: Posteroanterior (PA) plain film of the chest and coned-down view of the same image. Kerley B lines, or thickened interlobular septa (yellow arrows). Coned-down view shows Kerley B lines extending to the pleura (red arrows). The hila are indistinct and assume a “fluffy” appearance. Figure 70B: Axial and coronal CT image of the chest. Both images show interlobular septal thickening (yellow arrows), outlining the secondary pulmonary lobule.

Pulmonary edema (interstitial), pulmonary fibrosis, lymphangitic carinomatosis, sarcoidosis.