Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is redemonstration of a left apical pneumothorax approximately 4 .7 cm in craniocaudal dimension , previously measuring 3 .7 cm . Allowing for differences in technique and position , this could represent a minimal increase in size . There is no mediastinal shift . No focal consolidation or pleural effusion is identified . The cardiac and mediastinal silhouettes are normal . There is redemonstration of a left clavicular fracture .
    OUTPUT:
    
Redemonstration of left apical pneumothorax measuring approximately 4 .7 cm in craniocaudal dimension , allowing for differences in technique and position this could represent a minimal increase in size when compared to prior examination .