Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . Mediastinal contour is similar with diffuse atherosclerotic calcifications noted . Low lung volumes are demonstrated with crowding of the bronchovascular structures and possible mild pulmonary vascular congestion . Focal opacity in the retrocardiac region is concerning for pneumonia with blunting of the left costophrenic angle suggestive of a trace left pleural effusion . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Left lower lobe pneumonia and trace left pleural effusion . Low lung volumes with possible mild pulmonary vascular congestion