Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An nodule in the left upper lobe appears unchanged compared to the prior chest radiograph and has been previously evaluated with chest CT and PET - CT . No new focal opacity , pulmonary edema , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal . There is chronic disk space narrowing in the thoracic spine .
    OUTPUT:
    
No acute intrathoracic process .