Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show unchanged tips of central venous catheters , left subclavian and right internal jugular . Compared to the prior study , there has been increase in lung volumes with continued bibasilar scarring . The cardiac and mediastinal contours are normal . No focal opacity concerning for pneumonia is seen . No evidence of pulmonary edema . No pleural effusions or pneumothorax .
    OUTPUT:
    
Interval improvement in lung volumes since ___ with no new acute process such as pneumonia , pulmonary edema , or pneumothorax .