Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes with secondary crowding of the bronchovascular markings . No definite superimposed edema nor consolidation . There is no pleural effusion . Cardiac silhouette is top - normal , likely accentuated by low lung volumes and AP technique . There is tortuosity of the thoracic aorta . No acute osseous abnormalities . Degenerative changes noted at the right acromioclavicular joint .
    OUTPUT:
    
Low lung volumes without definite acute cardiopulmonary process .