Hypersensitivity Pneumonitis, Acute-Subcute Jud W. Gurney, MD, FACR Key Facts Terminology Diffuse granulomatous interstitial lung disease caused by inhalation of various antigenic particles (microbes, animal proteins, and low-molecular weight chemicals)…

Asbestosis Helen T. Winer-Muram, MD Key Facts Terminology Interstitial lung disease due to inhalation of asbestos fibers Imaging Findings Morphology: Fibrosis centered on respiratory bronchioles Lung cancer: Lower zone predominance…

Idiopathic Pulmonary Fibrosis C. Nicholas Fetko, MD Aqeel A. Chowdhry, MD Tan-Lucien H. Mohammed, MD, FCCP Key Facts Terminology Idiopathic interstitial pneumonias of unknown cause Associated with histologic pattern of…

Lipoid Pneumonia Helen T. Winer-Muram, MD Key Facts Terminology Exogenous lipid pneumonia: Aspiration or inhalation of animal, vegetable, or mineral oils Imaging Findings Low CT attenuation areas (-10 and -150…

Rheumatoid Necrobiotic Nodules Helen T. Winer-Muram, MD Key Facts Terminology Subacute or chronic inflammatory polyarthropathy of unknown cause Imaging Findings Rheumatoid nodules (seen in < 5%) Solitary or multiple, 0.5-7…

Talcosis Jud W. Gurney, MD, FACR Key Facts Imaging Findings Inhalational Diffuse fine-granular nodularity with high attenuation perihilar PMF Aggregation of nodules into PMF (identical to silicosis) International Labor Office…

Ankylosing Spondylitis Martha Huller Maier, MD Key Facts Terminology Chronic seronegative inflammatory arthropathy with predilection for axial skeleton Imaging Findings Spinal disease nearly always precedes lung involvement Upper lobe severe…

Pulmonary Venoocclusive Disease Jud W. Gurney, MD, FACR Key Facts Terminology Rare cause of pulmonary hypertension due primarily to occlusion of post-capillary venous radicles Imaging Findings Pulmonary arterial hypertension +…

Noncardiogenic Pulmonary Edema Aliye O. Bricker, MD Tan-Lucien H. Mohammed, MD, FCCP Key Facts Terminology Acute lung injury is general term for hypoxemic respiratory failure due to alveolar epithelial and…

Lymphangioleiomyomatosis Melissa L. Rosado-de-Christenson, MD, FACR Key Facts Terminology Proliferation of atypical smooth muscle cells in lungs & lymphatics associated with pulmonary cysts Imaging Findings Radiography Normal or increased lung…