Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal portable view of the chest was obtained . The heart is of normal size with normal cardiomediastinal contours . Lung volumes are low , causing slight crowding of bronchovascular markings . The lungs are otherwise clear without focal consolidation , nodule , or effusion . No pneumothorax . Osseous structures are unremarkable . No radiopaque foreign body .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process .