Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are decreased lung volumes . Redemonstrated is atelectasis of the left lower lobe . There is mild , linear atelectatic changes seen within the right lower lobe . There may be a small left pleural effusion , seen only on the lateral projection . No focal consolidation , pneumothorax , or pulmonary edema is identified . The heart size is at the top end of normal . The aorta is mildly tortuous . There are moderate to severe degenerative changes noted within the lower thoracic spine .
    OUTPUT:
    
Minimal bibasilar atelectasis and a small left pleural effusion .