Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable cardiomediastinal and hilar contours . Minimal linear opacification along the cardiac apex is present across multiple prior studies and is consistent with scarring . Otherwise , lungs are clear . No peribronchial cuffing evident . No pleural effusion or pneumothorax identified . Stable mild left apical pleural thickening evident .
    OUTPUT:
    
No acute intrathoracic process .