Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right internal jugular catheter tip projects within the mid SVC . A right basilar Pleurx catheter is in stable position . Since the prior examination , there is increased apparent lucency demonstrated in the left aspect of the aortic knob , that though may be projectional , pneumomediastinum can not be excluded . There is improvement in bibasilar opacification , likely atelectases . In addition , there is improvement in pulmonary vascular engorgement . There is no evidence of pneumothorax . The cardiomediastinal and hilar contours are stable .
    OUTPUT:
    
1 . Apparent lucency demonstrated in the left aspect of the aortic knob , that though may be projectional , pneumomediastinum can not be excluded . If of clinical concern , chest CT can be performed . 2 . Interval improvement in interstitial edema and bibasilar atelectasis . Findings were discussed with Dr . ___ at 4 :20 p .m . on ___ via telephone by Dr . ___ .