Air trapping is a conclusive sign of airway obstruction6 and appears as areas of decreased attenuation resulting from the presence of gas retained in the lung parenchyma.7 It may be necessary to compare between inspiratory and end-expiratory HRCT scans to determine the extent of air trapping, especially if the degree of air trapping is minimal.7 Patients with normal inspiratory scans frequently have signs of air trapping on expiratory scans, suggesting that expiratory scans should be performed as part of a standard evaluation.6
Recognizing and Differentiating Between Features of ILD on HRCT
Recognizing and Differentiating Between Features of ILD on HRCT
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- HRCT Primer
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Role of HRCT in Diagnosing Interstitial Lung Disease
- Overview of Interstitial Lung Disease (ILD)
- Multidisciplinary Approach
- Narrowing the Differential Diagnosis
- Evaluating the Features of an HRCT Scan
- HRCT Interpretation Algorithm for Suspected Fibrotic Interstitial Lung Disease
- Criteria for UIP Pattern
- UIP Pattern
- Probable UIP Pattern
- Indeterminate for UIP Pattern
- Nonspecific Interstitial Pneumonia
- NSIP Subpleural Sparing
- Differentiating UIP and NSIP
- Cryptogenic Organizing Pneumonia
- Spectrum of Findings with Chronic Hypersensitivity Pneumonitis
- Chronic Hypersensitivity Pneumonitis
- Fibrotic Sarcoidosis
- HRCT Diagnostic Criteria for HP, NSIP, and UIP
- Chronic HP Mimicking NSIP
- Quiz: Differentiating Between Chronic HP, NSIP, and UIP
- Optimal HRCT Technique for Evaluation of ILD
- Patient Case Studies
- Home
- HRCT Primer
-
Role of HRCT in Diagnosing Interstitial Lung Disease
- Overview of Interstitial Lung Disease (ILD)
- Multidisciplinary Approach
- Narrowing the Differential Diagnosis
- Evaluating the Features of an HRCT Scan
- HRCT Interpretation Algorithm for Suspected Fibrotic Interstitial Lung Disease
- Criteria for UIP Pattern
- UIP Pattern
- Probable UIP Pattern
- Indeterminate for UIP Pattern
- Nonspecific Interstitial Pneumonia
- NSIP Subpleural Sparing
- Differentiating UIP and NSIP
- Cryptogenic Organizing Pneumonia
- Spectrum of Findings with Chronic Hypersensitivity Pneumonitis
- Chronic Hypersensitivity Pneumonitis
- Fibrotic Sarcoidosis
- HRCT Diagnostic Criteria for HP, NSIP, and UIP
- Chronic HP Mimicking NSIP
- Quiz: Differentiating Between Chronic HP, NSIP, and UIP
- Optimal HRCT Technique for Evaluation of ILD
- Patient Case Studies
Idiopathic Pulmonary Fibrosis (an Update) and Progressive Pulmonary Fibrosis in Adults: An Official ATS/ERS/JRS/ALAT Clinical Practice Guideline
Reference
6. Arakawa H, Niimi H, Kurihara Y, Nakajima Y, Webb WR. Expiratory high-resolution CT: diagnostic value in diffuse lung diseases. Am J Roentgenol. 2000;175:1537-1543.
7. Hansell DM, Bankier AA, MacMahon H, et al. Fleischner Society: glossary of terms for thoracic imaging. Radiology. 2008;246:697-722.
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