Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest show no acute intrathoracic process . Flattened diaphragms and pulmonary blebs are consistent with obstructive lung disease . The mediastinum and pleural structures are unremarkable . Calcifications are seen within the aortic arch . The shoulders are not fully evaluated , however , there are no suspicious osseous lesions . Degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
No acute intrathoracic process .