Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are again noted . Patient 's chin obscures visualization of the right lung apex . There is no confluent consolidation , large effusion or overt pulmonary edema . Prior tracheostomy tube is not visualized . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Low lung volumes without definite superimposed acute cardiopulmonary process .