Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube is seen well positioned in the trachea . A left PICC line extends to the mid portion of the SVC . Cardiomediastinal and hilar contours are normal . Lower lung volumes exaggerate bibasilar opacities which appear more confluent and severe on today 's examination . There is increased mild pulmonary vascular congestion . No definite pleural effusions or pneumothorax .
    OUTPUT:
    
Worsening bibasilar opacities , which may be related to lower lung volumes or to increased pulmonary vascular congestion .