Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with chest radiograph from ___ , there has been interval removal of left chest tube . There is a new small left apical pneumothorax without evidence of tension . There is persistent subcutaneous air along the left lower neck . Area of heterogeneous opacity in the left mid-zone reflect aspiration or infection . No pleural effusion , vascular congestion or pulmonary edema . Mediastinal and hilar contours are stable . Heart size is normal .
    OUTPUT:
    
1 . Heterogeneous opacity in left mid-zone may reflect aspiration or infection . 2 . Small left apical pneumothorax .