Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright view of the chest was reviewed and compared to the prior studies . A right - sided PICC line ends in the lower superior vena cava . A left - sided vascular stent projects over the medial portion of the left clavicle . Median sternotomy wires are intact and relatively aligned . The mild pulmonary edema has improved . Low lung volumes and bibasilar atelectasis have improved compared to the most recent prior , but persist . There is no pleural effusion or pneumothorax . The cardiac and mediastinal contours are unchanged .
    OUTPUT:
    
Improved mild pulmonary edema and bibasilar atelectasis .