Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ , there is no significant change . Postoperative changes on the right are stable . A small left pleural effusion and basilar atelectasis is unchanged . No pneumothorax . Mild cardiomegaly is stable . There is no pulmonary edema . The aortic valve replacement is unchanged in position .
    OUTPUT:
    
No acute cardiopulmonary process .