Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left PICC ends in the proximal right atrium and can be pulled back approximately 2 cm for positioning at the superior cavoatrial junction . There is no pneumothorax . Lung volumes have increased from prior with persistent prominence of the interstitial markings , representing interstitial edema . Cardiomegaly is unchanged . There is tortuosity of the thoracic aorta . Surgical clips are seen and at the left lung apex . There is a small right pleural effusion .
    OUTPUT:
    
1 . Left PICC ending in the proximal right atrium and can be pulled back approximately 2 cm for positioning at the superior cavoatrial junction . 2 . No significant change in interstitial edema given differences in lung volumes .