Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . There is no pneumothorax . There may be a small right subpulmonic effusion . The lungs are well expanded and clear with only minimal opacification in the region of the superior segment of the right lower lobe . Pulmonary vasculature is within normal limits .
    OUTPUT:
    
Possible small right subpulmonic effusion . No other acute cardiopulmonary process .