Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and prosthetic cardiac valve replacement with mild cardiomegaly noted . The aorta is mildly tortuous with atherosclerotic calcifications seen at the aortic knob . Hilar contours are unremarkable . There is mild upper zone vascular redistribution , likely due to supine positioning , without overt pulmonary edema . No focal consolidation , large pleural effusion or pneumothorax is detected on this supine exam . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .