Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate well expanded lungs . The cardiomediastinal and hilar contours are unremarkable . There is stable - appearing fibrosis at the bilateral lung apices . No pleural effusion , pulmonary vascular congestion , or pneumothorax is seen .
    OUTPUT:
    
No evidence of pneumothorax .