Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new pigtail catheter projecting over the left lower hemithorax with marked reduction in a pleural effusion , which is now small . There is a new small pneumothorax following insertion of the catheter . Reduction and pleural effusion reveals a similar cavitary lesion at the left lung apex to the earlier study . The right lung remains clear . The cardiac , mediastinal and hilar contours appear probably unchanged . The bones appear demineralized .
    OUTPUT:
    
Marked reduction in left pleural effusion after catheter placement . Small new left - sided pneumothorax .