Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bedside AP radiograph of the chest re-demonstrates the patient 's longstanding chronic left lower lobe collapse . Between ___ and yesterday , a segment of aerated lung overlying the left heart border has become uniformly opacified . This may be due to atelectasis of the lingula . The lungs are otherwise clear . Heart is top normal in size and chronically leftward shifted . Once again , the left PICC terminates within the right atrium and would need to be withdrawn 5 .5 cm to ensure placement in the low SVC .
    OUTPUT:
    
1 . Left lingular atelectasis superimposed on chronic left lower lobe collapse . No evidence of acute cardiothoracic process . 2 . The left PICC needs to be withdrawn 5 .5 cm to ensure proper placement in the low SVC .