Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright chest radiograph provided . Lung volumes are low and underpenetrated technique limits evaluation . Allowing for this , no convincing signs of pneumonia or CHF . No large effusion or pneumothorax is seen . The cardiomediastinal silhouette appears stable . Bony structures are intact .
    OUTPUT:
    
No convincing signs of pneumonia on this limited portable radiograph .