Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right upper extremity PICC line is unchanged in position , with its tip in the mid SVC . The lung volumes are slightly decreased compared with prior , accentuating the pulmonary vasculature . There is no pleural effusion or pneumothorax . The cardiac silhouette and mediastinal contours are normal .
    OUTPUT:
    
No acute chest abnormality .