LUNG NODULE New Nodule Nodule on CXR > 2 Years Without a Change in Size Lung NoduleMultiple Nodules Solitary Nodule Scar Granuloma Arteriovenous Malformation Malignant Neoplasm Pulmonary Embolism* Benign Neoplasm (eg. Hamartoma, Lipoma, Fibroma) Granuloma Abscess Arteriovenous Malformation Bronchogenic Cyst Rounded Atelectasis Malignancy Infection Inflammation Vascular Fungal Tuberculosis Septic Embolism Parasitic Rheumatoid Arthritis Wegener's Granulomatosis Sarcoidosis Pneumoconiosis Pulmonary Embolism* Arteriovenous Malformation Hereditary Hemorrhagic Telangiectasia Primary lung cancer Metastates ("cannonball lesions"; Eg. Melanoma, Head & Neck, Sarcoma, Colon, Kidney, Breast, Testicle) Single Round Lesion < 3cm In Diameter > 3cm = Mass (malignancy until proven otherwise)* Denotes acutely life-threatening causes

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