Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube in situ with the tip 30 mm proximal to the carina . Right basilar airspace opacification improved compared to previous imaging done ___ , but has not resolved . Small associated right - sided effusion . The left retrocardiac opacity is slightly improved . No pulmonary edema . No pneumothorax .
    OUTPUT:
    
Interval improvement as described above .