Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to ___ , left bronchial stent appears to have migrated inferiorly . No pneumothorax . Low lung volumes and portable x-ray can cause crowding of the bronchovascular markings versus mild pulmonary vascular congestion . Increasing subsegmental atelectasis in the lingula and lower lobes bilaterally .
    OUTPUT:
    
Left bronchial stent has migrated inferiorly . Increasing subsegmental atelectasis bilaterally . No pneumothorax .