High-Res Chest CT Patterns - Differential Diagnosis Framework Reticular: • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar Proteinosis, Lymphoma, Sarcoidosis, Silicosis • Honeycombing - See Low Attenuation Nodular: • Random: Metastases, Miliary Infection (TB, Fungal) • Perilymphatic: Sarcoidosis, Silicosis, Lymphangitic Carcinoma, Coal Pneumoconiosis • Centrilobular: Hypersensitivity Pneumonitis, Respiratory Bronchiolitis, Bronchopneumonia High Attenuation: • Acute Ground Glass: Edema, Hemorrhage, Pneumonia, Acute Hypersensitivity, Acute Eos PNA • Chronic Ground Glass: Hypersensitivity Pneumonia, COP, Chronic Eos PNA, Fibrosis, BAC • Crazy Paving: Alveolar Proteinosis, Sarcoidosis, NSIP, COP, Infection, Neoplasm (BAC), Hemorrhage, Edema • Consolidation: Pus, Blood, Water, Tumor Low Attenuation: • Emphysema: Smoking, Alpha-1-Antitripsyn Def • Cysts: Congenital, Langerhans Histiocytosis, Lymphocytic Int PNA, Lymphangioleiomyomatosis • Honeycombing: Idiopathic Pulmonary Fibrosis, RA, Scleroderma, End-Stage Hypersensitivity, End-Stage Sarcoidosis • Bronchiectasis: Prior Infection, Aspiration, Cystic Fibrosis, ABPA, Immune Deficiency Sophia Hayes MD @Sophia_Hayes_MD #High #Resolution #HiRes #HighRes #Chest #CT #Patterns #Differential #Diagnosis #pulmonary #radiology
