Pulmonary Lymphangiectasia Etiology: congenital grossly dilated lymphatic vessels throughout the lungImaging: perihilar infiltrates due to interstitial and interlobular septal thickening, chylothoraxDDX: pulmonary edema Radiology Cases of Pulmonary Lymphangiectasia CXR AP and lateral shows mild cardiomegaly and diffuse interstitial infiltrates with no evidence of pleural effusions.