Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube is in satisfactory position , unchanged from the prior exam . A right PICC is unchanged with the tip in the low SVC . Since the prior exam , the lung volumes are lower , somewhat accentuating the bronchovascular structures . There is unchanged mild edema . The right basilar atelectasis has improved . There is no new opacity , pleural effusion , or pneumothorax . The mediastinal contours are normal . The heart size is mildly enlarged , and unchanged .
    OUTPUT:
    
Unchanged mild pulmonary edema . Improving atelectasis .