Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild - to - moderately enlarged . There is moderate pulmonary vascular engorgement and mild interstitial pulmonary edema . A more confluent opacity is seen involving the left lower lobe . No pleural effusion or pneumothorax is identified . A vascular stent projects over the right apex .
    OUTPUT:
    
Mild vascular engorgement and mild interstitial pulmonary edema . More focal opacity involving the left base is seen . Underlying infection should be considered in the appropriate clinical setting .