Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Lung volumes are low limiting assessment . Lungs appear clear without focal consolidation , large effusion or pneumothorax . Cardiomediastinal silhouette appears grossly stable . No overt edema . Bony structures appear intact with degenerative changes again noted at the AC joints .
    OUTPUT:
    
No overt abnormality . Difficult to exclude mild edema .