Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph demonstrates a left supraclavicular central venous dialysis catheter , it s tip in similar position relative to prior study performed ___ , probable mid superior vena cava . Lung volumes are low , similar to prior examination . Bibasilar atelectasis is moderate . Blunting of bilateral costophrenic angles is suggestive of small pleural effusions bilaterally . Lingular opacity appears slightly more conspicuous relative to prior study worrisome for infectious process in the correct clinical setting . Cardiomediastinal and hilar contours appear grossly similar to prior study . There is no pneumothorax . There is no evidence of pulmonary edema .
    OUTPUT:
    
Lingular opacity appears slightly more conspicuous relative to prior examination which in the appropriate clinical setting would be worrisome for infectious process . Atelectasis and superimposed shadows are however alternative etiologies .