Kerley B lines in total anomalous pulmonary venous connection below the diaphragm (type III)

A case is presented of total anomalous pulmonary venous connection below the diaphragm, with roentgenographic evidence of pulmonary edema, interstitial edema and a normal cardiac silhouette. These findings led to a diagnosis of pulmonary venous obstruction proximal to the mitral valve. Our findings confirm that the morphologic substratum of Kerley B lines is predominantly edema of the interlobular septum.