CHF Kerley B Lines and Thickening of the Interlobular septa
74-year-old female presents in CHF and an echo showing reduced EF (35%)
CT scan from a coronary CTA with a limited field of view above, and magnified below shows thickening of the interlobular septa extending to the periphery and in contact with the pleural surface indicating moderate CHF
Ashley Davidoff MD TheCommonVein.net 003H RnD

There are other causes of interlobular septal thickening, caused by involvement of the venule, the lymphatics or the septal connective tissue