Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right internal jugular sheath terminates in the upper SVC . There is a small to moderate effusion and adjacent pulmonary opacity at the base of the left lung . There is minimal atelectasis at the base of the right lung . There is a small left apical pneumothorax .
    OUTPUT:
    
Small left apical pneumothorax . Small to moderate left pleural effusion and adjacent pulmonary opacity which likely reflects compressive atelectasis . Minimal atelectasis at the right base .