Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouettes are normal . The bilateral hila are unremarkable . There is a sub - optimal inspiratory effort . There is right mid lung and left lower lung atelectasis . Otherwise , the lungs are clear . There is no pulmonary vascular congestion . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary process . Low lung volumes .