Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is blurring of detail due to respiratory motion . Moderately severe cardiomegaly is chronic . Mediastinum is persistently widened by a tortuous aorta and probably also vascular ectasia . There is mild perihilar vascular engorgement ; however , no significant pulmonary edema is identified . Increase in opacity in the retrocardiac region may be secondary to atelectasis and overlao of vascular shadows ; however , an acute infectious process can not be excluded . There is no large pleural effusion or pneumothorax . Again seen is hyperinflatipm and flattered diaphragms suggesting bacground COPD .
    OUTPUT:
    
Subtle increase in opacity at the retrocardiac region may be secondary to atelectasis ; however , an acute infectious process can not be excluded . MIld vascular plethora .