Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable supine frontal view chest . Lung volumes low compared to prior exams , with mild bronchovascular crowding . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .