CT appearance of asymmetric lymphangitic carcinomatosis

Asymmetric lymphangitic spread of bronchogenic carcinoma, primarily involving the right lung. Thickened bronchovascular bundles and a fine reticular pattern are seen and probably represent thickened interlobular and intralobular septae. Polygon formation is seen in the anterior and medial aspect of the right lung. Several thickened interlobular septa are present, abutting the medial pleura of the right lung.