Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate a stable left PICC with tip in the upper SVC . Right upper chest wall deformities are redemonstrated , compatible with healed rib fractures . The heart is top normal in size . The mediastinal and hilar contours are within normal limits . There is mild unfolding of the thoracic aorta . A small right pleural effusion persists . Bibasilar atelectasis appears improved since two days prior . There is no pneumothorax or pulmonary vascular congestion .
    OUTPUT:
    
Improved bibasilar atelectasis .