Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained demonstrating low lung volumes which limit evaluation . There is mild left retrocardiac linear density which is likely atelectasis . No definite signs of pneumonia or CHF . No pleural effusion or pneumothorax . Overall , heart size appears within normal limits . The mediastinal contour is normal . Bony structures are intact . No definite signs of free air below the right hemidiaphragm .
    OUTPUT:
    
Limited , negative .