Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal silhouette is unremarkable . The chest is hyperinflated . There is an otherwise unexplained thin left apical line , a possible trace left - sided pneumothorax .
    OUTPUT:
    
Possible trace left apical pneumothorax . Clear lungs . Findings discussed with Dr . ___ at 4 : 25 pm by telephone .