Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , causing bronchovascular crowding . The cardiomediastinal and hilar silhouettes are normal . There may be mild bibasilar atelectasis . No focal consolidation , pleural effusion , or pneumothorax detected . Although chest radiograph is not optimal for evaluation of the chest cage after trauma , no evidence of rib fractures or other bony abnormalities .
    OUTPUT:
    
Low lung volumes , but no acute cardiopulmonary process . Chest radiograph is not optimal for evaluation of the chest cage after trauma , but there is no evidence of rib fractures or other bony abnormalities on the current study .