Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is new compared to the previous exam . The aorta is mildly tortuous . Hilar contours are normal . Pulmonary vasculature is not engorged . Retrocardiac opacity may reflect atelectasis , but infection is not excluded in the correct clinical setting . No pleural effusion or pneumothorax is present . Degenerative changes are noted involving the left glenohumeral joint .
    OUTPUT:
    
1 . Moderate enlargement of the cardiac silhouette , new from the prior chest radiograph which may reflect cardiomyopathy , though a component of a pericardial effusion is not excluded . Echocardiogram is suggested for further assessment . 2 . Retrocardiac opacity may reflect atelectasis , but infection is not excluded in the correct clinical setting .