Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate well inflated lungs . There is no focal opacity convincing for pneumonia . Cardiac and hilar contours are within normal limits . There is no pleural effusion or pneumothorax . Cardiac device appears appropriately positioned . A aortic valvular prosthesis is in similar orientation relative to prior study . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No acute intrathoracic abnormality .