Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Again seen is left base atelectasis / scarring , seen on studies dating back to ___ . No definite new focal consolidation is seen . There is no pleural effusion . Cardiac and mediastinal silhouettes are stable . No pneumothorax is seen .
    OUTPUT:
    
Subtle left base / lingular somewhat linear opacity most likely represents atelectasis / scarring . However , if the patient has been treated for underlying pneumonia since the prior study , consider chest CT for further evaluation for confirmation , as question early pneumonia has been raised in the past in this location . There is minimal pulmonary vascular congestion .