Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes have decreased in the interim with associated bronchovascular crowding . Slight interval increase in retrocardiac opacity with air bronchograms likely reflects atelectasis and / or vascular crowding in the setting of lower lung volumes . No pneumothorax . Mild cardiomegaly persists . Trace fluid in the center fissure is noted . Rounded opacity projecting just to the left of midline over the heart may be projectional . Nonspecific gaseous distension of bowel loops in the upper abdomen is noted . Mild dextroconvex scoliosis , unchanged .
    OUTPUT:
    
Interval slight increase in retrocardiac opacity likely reflects atelectasis and lower lung volumes .