Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates clear lungs bilaterally . There is no pleural effusion or pneumothorax . Patient is status post median sternotomy . There is no evidence of pulmonary edema . Cardiomediastinal and hilar contours appear within normal limits . Aortic valve replacement again seen . Right PICC is no longer visualized . Osseous structures are without an acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality .