Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph obtained . Lateral inferior aspect of the right CP angle is excluded . Low lung volumes limits evaluation , though allowing for this , the lungs appear clear without focal consolidation , large effusion , or pneumothorax . No definite signs of pulmonary edema or overt CHF . Cardiomediastinal silhouette appears essentially unchanged with a slightly unfolded thoracic aorta . Bony structures appear intact .
    OUTPUT:
    
No acute intrathoracic process .