Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . Pleural thickening and postoperative changes are seen at the lateral right lung base , improved from the prior examination . There is a small to moderate right apical pneumothorax . There is no pleural effusion or evidence of pulmonary edema .
    OUTPUT:
    
Small to moderate right apical pneumothorax . No consolidation , or effusion .