Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy is in - situ , unchanged in position . A left - sided PICC terminates in the mid SVC . There is moderate cardiomegaly , unchanged compared to the prior study . Bibasilar opacities have improved somewhat on the right . There is residual left basal opacity likely reflecting atelectasis . Infection can not be excluded . No pneumothorax seen .
    OUTPUT:
    
Slight interval improvement in the right basal airspace opacity .