Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left pigtail catheter position is unchanged . Visualized upper portion of lumbar spinal hardware is intact . Small , residual left pleural effusion . Left apical and perihilar opacities are unchanged . Interval resolution of left apical pneumothorax . Unchanged thoracic scoliosis . Bilateral tenting of the hemidiaphragms suggests mild volume loss . Normal cardiomediastinal contours .
    OUTPUT:
    
Small , residual left pleural effusion . Unchanged left apical and perihilar opacities .