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Ontology Browser

Expiratory air trapping (HP:0032968)
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Parent Terms Term With Siblings Child Terms
Air bronchogram  
Air crescent 
Air trapping 
Apical pulmonary opacity 
Atelectasis +   
Beaded septum sign 
Continuous diaphragm sign 
Expiratory air trapping 
Abnormal retention of gas within a lung or part of a lung, as a result of airway obstuction of abnormalities in lung compliance. In the classic presentation, the lung will appear normal at inspiration, but on exhalation, the diseased portions of the lung which have lost connective tissue recoil will remain lucent while the healthy portions of the lung will become more dense due to atelectasis. This helps distinguish it from mosaic attenuation due to patchy fibrosis, as occurs with nonspecific interstitial pneumonia, and in early usual interstitial pneumonitis (the hallmark imaging diagnosis of interstitial lung disease) in which there is no change with inspiration and expiration.
Mass on thoracic imaging +   
Organizing pneumonia  
Progressive massive fibrosis 
Pulmonary blood flow redistribution 
Pulmonary cavity +  
Pulmonary imaging sign +  
Pulmonary infiltrates +   
Pulmonary interstitial high-resolution computed tomography abnormality +   
Pulmonary mycetoma 
Pulmonary nodule +   
Pulmonary oligemia 
Pulmonary opacity +   
Pulmonary pseudocavity 

Definition Sources: LMU:crapp, PMID:10524809, PMID:18195376, PMID:7972745

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