Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is upper limits of normal in size but difficult to assess due to low lung volumes . There is no pleural effusion or pneumothorax . The lung volumes are low , but without focal consolidation concerning for pneumonia . A monitor hiatal hernia is noted . The upper abdomen is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .