Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes cause bronchovascular crowding . Allowing for this , there is no significant pulmonary vascular congestion or pulmonary edema . There is no pleural effusion , focal consolidation , or pneumothorax . The cardiomediastinal silhouette is stable . A moderate hiatal hernia is unchanged from multiple prior studies . The osseous structures and upper abdomen are unremarkable .
    OUTPUT:
    
Low lung volumes causing bronchovascular crowding . No acute cardiopulmonary process .