Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left basilar opacity has increased in size since the prior study yesterday at 14 : 45 . There is a small amount of loculated pneumothorax . The right lung is clear . Cardiac silhouette is widened by then known mass and pericardial effusion . The mediastinal structures are shifted rightward by the left lower lobe density .
    OUTPUT:
    
Increased opacity at the left base representing a combination of the known mediastinal mass , atelectasis , and hydro pneumothorax .