Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior , lung volumes are lower . Relative enlargement of the cardiomediastinal silhouette is likely secondary to low lung volumes . The hilar contours have not changed , including prominence on the right corresponding to a enlarged pulmonary vein on chest CT . Right apical opacity also corresponds to prominent venous and arterial vessels . Mild interstitial edema is present . Linear atelectasis in the right lung and retrocardiac atelectasis have increased . There is no pneumothorax .
    OUTPUT:
    
Lower lung volumes with increased retrocardiac and left opacities likely representing a combination of atelectasis and pleural fluid , in the appropriate clinical setting a superimposed pneumonia at the left base would be possible .