Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph is obtained . Lung volumes are markedly low which limits the evaluation . Allowing for this , no definite sign of pneumonia , CHF , pleural effusion , or pneumothorax . Heart size appears grossly within normal limits . Bronchovascular crowding likely accounts for slight hilar prominence . Bony structures appear intact .
    OUTPUT:
    
No acute findings on this limited exam .