Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no pneumothorax , pleural effusion or obvious fractures . The cardiomediastinal silhouette is within normal limits . No masses or lesions are seen within the lung fields . The lungs are well expanded and clear bilaterally . The pleural surfaces are unremarkable .
    OUTPUT:
    
No acute intrathoracic process .