Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Assessment of the lung apices is slightly obscured by the patient 's chin and neck projecting over these areas . Left - sided pacer device is noted with leads in unchanged positions in the right atrium and right ventricle . Severe cardiomegaly persists . The mediastinal and hilar contours are unchanged . Previously noted mild pulmonary edema has improved . Small left pleural effusion appears similar in size . Retrocardiac opacification and patchy right basilar opacities may reflect atelectasis though infection is not excluded . No definite pneumothorax is identified .
    OUTPUT:
    
Slightly limited assessment of the lung apices . Mild pulmonary edema , improved in the interval with similar - appearing small left pleural effusion . Retrocardiac opacification and patchy right basilar opacities may reflect atelectasis , but infection is not excluded in the correct clinical setting .