Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright PA and lateral views of the chest demonstrate no evidence of pulmonary edema . The cardiac silhouette size is normal and there is no pleural effusion . No pneumothorax is seen . Mediastinal and pulmonary structures are unremarkable . Degenerative changes are seen within the bilateral acromioclavicular joint as well as of the thoracic spine .
    OUTPUT:
    
No acute intrathoracic process .