Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided pacemaker device is noted with leads terminating in the right atrium and right ventricle . There is massive cardiomegaly . The aorta is tortuous and calcified . There is mild pulmonary vascular congestion , but no overt pulmonary edema . Retrocardiac opacity may reflect atelectasis . No pleural effusion or pneumothorax is identified . Degenerative changes of both glenohumeral joints are present , more severe on the left with subchondral cysts and osteophyte formation .
    OUTPUT:
    
Massive cardiomegaly with mild pulmonary vascular congestion . Probable retrocardiac atelectasis .