Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , there has been no significant interval change . Left superior and lateral pneumothorax is seen with adjacent parenchymal opacities again noted . Retrocardiac opacity silhouettes the hemidiaphragm compatible with known effusion . The right lung is clear . Cardiac silhouette is difficult to assess and is unchanged . No acute osseous abnormalities .
    OUTPUT:
    
Persistent left - sided pneumothorax , not significantly changed . Retrocardiac opacity compatible known effusion .