Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right apical ___ was done recently . Right - sided chest tube is in unchanged position and a minimal apical pneumothorax has slightly improved measuring 5 .6 mm . The left lung is unremarkable . Mediastinal and cardiac contours are normal . There is no pleural effusion .
    OUTPUT:
    
Residual minimal apical right pneumothorax has slightly improved .