Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph is obtained . There are low lung volumes which limit evaluation . Allowing for this , there is no focal consolidation , effusion , or pneumothorax . Cardiomediastinal silhouette appears grossly stable . Atherosclerotic calcifications along the aortic knob noted . Bony structures appear intact .
    OUTPUT:
    
No acute intrathoracic process on this limited chest radiograph .