Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The small left apical pneumothorax is new or newly apparent without signs of tension . A left basal pigtail pleural drain reaches the midline , unchanged . Greater opacification in the left lower lobe reflects decreasing aeration because of atelectasis , affects of contusion , even early pneumonia . The aneurysmal ascending aorta ( CT , ___ ) explains the prominent right lateral bulge of the supracardiac mediastinum . A hollow viscus in the left upper quadrant distended with non solid contents could be stomach or splenic flexure . Unchanged left rib fractures , again identified .
    OUTPUT:
    
Worsened left lower lobe atelectasis , delayed contusion , or early pneumonia . Close follow up advised . Small left apical pneumothorax appears newly apparent . Unchanged left rib fractures , again identified .