Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax . There is no pleural effusion . Pulmonary vascularity is normal . There is a linear lucency beneath the right hemidiaphragm .
    OUTPUT:
    
No acute cardiopulmonary process . Small amount of free air is present under the right hemidiaphragm . Correlate clinically given that the patient has a peritoneal dialysis catheter in place .