Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . A right PICC line terminates in the low SVC . There is no pneumothorax . Vascular crowding contributes to increased lung markings . Bibasilar subsegmental atelectasis is minimally improved on the left . Extensive bilateral shoulder degenerative changes are stable .
    OUTPUT:
    
Persistently low lung volumes with bibasilar subsegmental atelectasis .