Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate clear lungs . Cardiac size is enlarged and perhaps slightly increased since ___ . There is no pleural effusion , edema or pneumothorax . Unchanged left pectoral pacemaker and course of the pacemaker lead terminating in the right ventricle .
    OUTPUT:
    
Cardiomegaly without evidence of acute cardiopulmonary process .