Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is enlarged . Within the lungs , a 1 .5 cm oval shaped opacity is present in the left mid lung region , above the level of the imaging acquisition for the recent CTA . Lungs are otherwise clear except for minimal linear atelectasis or scarring at the bases . There are no pleural effusions .
    OUTPUT:
    
1 .5 cm opacity in left mid lung for which differential diagnosis includes focal atelectasis / scar , primary pulmonary malignancy , and a nodular focus of infection . Initial further evaluation with standard PA and lateral chest radiographs is recommended for confirmation and further characterization when the patient 's condition permits .