Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable cardiomediastinal and hilar contours . Specifically cardiomegaly noted on prior radiograph has resolved . Prosthetic aortic valve is in expected position . Lungs are clear . No pleural effusion or pneumothorax identified . Sternotomy sutures are midline and intact . Degenerative changes are noted in the thoracic spine as well as right humeral head .
    OUTPUT:
    
Resolved cardiomegaly . Lungs are clear .