Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Silhouetting of the left hemidiaphragm and blunting of the left costophrenic angle is new compared to the prior exam and suggest presence of small pleural effusion . Is probably also atelectasis . There is moderate pulmonary edema . Heart size is probably a moderate to severely enlarged , even in the setting of low lung volumes and portable technique . Elevation of the right hemidiaphragm is unchanged . Severe pulmonary vascular engorgement is overall unchanged . Right infrahilar opacity may reflect combination of atelectasis , edema . Concurrent infection can not be excluded . No pneumothorax . Extensive aortic knob calcifications are unchanged .
    OUTPUT:
    
Low lung volumes . Findings most consistent with volume overload . However , concurrent infection can not be excluded . This patient could benefit from a chest CT non-emergently .