Pulmonary lymphangiectasia HP:0006526 UMLS:C1855480 Abnormal dilatation of the pulmonary lymphatic vessels. Lymphatic fluid in the lung is derived from normal leakage of fluid out of the blood capillaries in the lung. In pulmonary lymphangiectasia, the pulmonary lymphatics are not properly connected and become dilated with fluid. Pulmonary lymphangiectasis HP:0006551 HP:0006521 Abnormal pulmonary lymphatics Lymphangiectasis