Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided internal jugular catheter with the tip at the cavoatrial junction . Status post ___ drain placement in the left chest and pericardium . Small loculated basal pneumothorax on the left . Vertical lucency in the left lung peripherally , may also represent component of the pneumothorax . Right - sided loculated pleural effusion and atelectasis have slightly improved . Left retrocardiac opacity has slightly increased . Mild cardiomegaly is unchanged .
    OUTPUT:
    
Basilar left pneumothorax , post ___ drain placement in the left chest and pericardium .