Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single erect portable view of the chest demonstrates low lung volumes , which accentuate the vasculature . Given the low lung volumes , it 's difficult to discern the heart size , but it is likely normal . No pleural effusion , edema , pneumothorax or evidence of pneumonia . There is no evidence of free air .
    OUTPUT:
    
Given low lung volumes , no acute cardiopulmonary process or evidence of free air .