Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 751 is submitted .
    OUTPUT:
    
The cardiac and mediastinal contours are stable with stable cardiac enlargement . There is possibly a small hiatal hernia . Overall , there is increasing opacity at the left base which is felt to more likely reflect an increasing left effusion , although airspace consolidation can not be entirely excluded . No evidence of pulmonary edema or pneumothorax . Right lung is grossly clear . Prominent right hilum most likely reflects prominent vasculature suggesting underlying pulmonary arterial hypertension in the setting of known emphysema when correlated with a chest CT dated ___ .