Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 13 11 is submitted .
    OUTPUT:
    
There is improved aeration at the left base , although persistent patchy opacity with associated layering effusion likely reflects residual atelectasis or resolving pneumonia . There is also improved aeration within the right lung possibly related to improved inspiration and resolving airspace disease . The right hilum appears somewhat prominent but when correlated with the recent chest CT of ___ , this likely reflects a combination of small hilar lymph nodes and prominent vascular structures . The heart remains enlarged . No pneumothorax .