Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overall lung volumes are low , which may accentuate heart size and vasculature , which appear increased in size compared with prior , with mild prominence of the pulmonary vasculature . No pleural effusion or pneumothorax is seen . There is atelectasis at the lung base .
    OUTPUT:
    
Apparent increase in size of the heart and mild prominence of the pulmonary vasculature may be secondary to overall low lung volumes and technique . No pneumonia .