Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal portable chest radiograph demonstrates unremarkable cardiomediastinal and hilar contours . Chronic interstitial lung changes in the lung bases , right greater than left , are new since ___ . No pleural effusion or pneumothorax is evident . No displaced rib fractures identified .
    OUTPUT:
    
No acute intrathoracic process . Chronic interstitial lung changes in bases , new since ___ . Could be further evaluated with coventional PA and lateral radiograph . Alternatively , if clinically indicated could be further evaluated with CT .