Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate stable cardiomegaly . Mediastinal and hilar contours are unremarkable . The lungs are clear . No pleural effusion or pneumothorax identified . Sternotomy sutures are in place . Prosthetic aortic valve is visualized . No osseous abnormality evident .
    OUTPUT:
    
No acute intrathoracic process .