Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable radiograph of the chest demonstrates moderate enlargement of the cardiac silhouette , not significantly changed compared to prior studies , allowing for somewhat oblique patient positioning and semi-upright technique . The lung volumes are low , with bibasilar atelectasis . No overt pulmonary edema , pleural effusion or pneumothorax is identified . No focal consolidation concerning for pneumonia is seen . Dilated loops of colon are again present , as before .
    OUTPUT:
    
Stable moderate cardiomegaly . Otherwise , no acute cardiopulmonary process .