Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient 's chin and overlying soft tissues obscure the lung apices . The tip of an accessed right pectoral MediPort is visible to the level of the superior cavoatrial junction . There is no obvious pneumothorax . Bibasilar subsegmental atelectasis is new since the prior exam . The lungs are otherwise clear . Mild cardiomegaly despite the projection is stable . The known right fourth rib fracture is not well seen on this exam . The patient has had prior left humeral fixation .
    OUTPUT:
    
New bibasilar subsegmental atelectasis .