Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One semi-erect portable AP view of the chest . There is a linear opacity in the left lower lobe that may represent atelectasis or early pneumonia . The right lung is clear . There is no pleural effusion . The apices are slightly obscured by the patient 's chin ; however , no definite pneumothoraces are seen . There is no pulmonary vascular congestion .
    OUTPUT:
    
Mild left lower lobe linear opacity either represents atelectasis or early pneumonia . Clinically correlate .