Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . An ovoid pleural - based opacity in the left upper lung field is unchanged compared with ___ and was present in ___ , and is thought to represent an area of pleural thickening or an extrapleural lipoma .
    OUTPUT:
    
No acute cardiopulmonary process .