Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube terminates approximately 3 cm above the level of the carina , improved compared to the prior study . A left - sided chest tube is in - situ . There is a small left apical pneumothorax , unchanged compared to the prior study . Subcutaneous emphysema again noted . An enteric tube is unchanged in position . No definite consolidation seen . No pleural effusion seen . Multiple left sided rib fractures again noted .
    OUTPUT:
    
Persistent small left apical pneumothorax .