Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate left apical pneumothorax , which is unchanged from the radiograph of earlier on the same day . There is a pigtail catheter in the left chest , in unchanged position . There is no focal consolidation , pleural effusion , or frank pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
1 . Stable appearance of moderate left apical pneumothorax .