Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiographs demonstrate unremarkable cardiomediastinal and hilar contours . Lungs are clear . No pleural effusion or pneumothorax evident . Minimal apical thickening noted bilaterally , unchanged compared to prior . No osseous abnormality evident .
    OUTPUT:
    
No acute intrathoracic process .