Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 23 :09 is submitted .
    OUTPUT:
    
The heart remains stably enlarged favoring cardiomegaly rather than pericardial effusion . Lungs are slightly low in volume with patchy opacity at the right base favoring atelectasis rather than pneumonia . There is mild pulmonary venous hypertension but no pulmonary edema . No pleural effusions . No pneumothorax .