Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , portable upright . There is a small left pleural effusion . There is bilateral lower lobe atelectasis . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax . Calcifications of the aortic arch are noted . An implanted pacemaker features intact , appropriate position lesions .
    OUTPUT:
    
Small left pleural effusion and bilateral lower lobe atelectasis .