Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single semi-upright portable view of the chest was obtained . There has been interval placement of a right - sided PICC , terminating in the upper to mid SVC . Blunting of the right costophrenic angle with a patchy right basilar opacity is similar to prior , likely representing chronic pleural thickening with associated atelectasis / scarring . The cardiac and mediastinal silhouettes are stable . Left lung is grossly clear . There is no pneumothorax .
    OUTPUT:
    
Chronic changes at the right lung base , stable over several prior studies .