Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph again demonstrates low lung volumes , which accentuate the pulmonary vasculature . This may also mask a pneumonia . Allowing for this limitation , there is no focal consolidation , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is difficult to delineate .
    OUTPUT:
    
Low lung volumes , but no evidence of pneumonia . PA and lateral views would be helpful , if obtainable .