Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no evidence of pneumothorax or pneumomediastinum . There is no free air within the abdomen . The cardiomediastinal and hilar contours are normal . Linear atelectasis is seen in the left perihilar region . No pleural effusion or focal consolidation is seen . No free air below the diaphragm .
    OUTPUT:
    
Linear subsegmental left lung atelectasis . Otherwise , unremarkable chest radiograph . No pneumomediastinum or free air below the diaphragm .