Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright portable view of the chest demonstrates interval placement of a right pigtail pleural catheter , directed toward the upper mediastinum on the right , with subsequent reexpansion of the right lung , with only a small right apical pneumothorax remaining . The left lung is clear . There is no pleural effusion . The cardiomediastinal silhouette is unremarkable , with no evidence of tension or mediastinal shift . No subdiaphragmatic free air is detected .
    OUTPUT:
    
Small residual right apical pneumothorax following chest tube placement .