Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is patchy left base opacity worrisome for left lower lobe pneumonia . The right lung is likely clear . A small focal opacity in the right medial lung base on the AP view , most likely represents vascular structure though additional site of consolidation is not excluded . Trace left pleural effusion is seen . The cardiac silhouette is mildly enlarged . The aorta is somewhat tortuous .
    OUTPUT:
    
Left lower lobe pneumonia . Possible additional small focus of infection in the right lung versus vascular structure .