Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright chest radiograph . Lungs are low in volume with slightly improved , retrocardiac atelectasis . There is no pleural effusion or pneumothorax . Heart and mediastinal contours are unremarkable . Port - A - Cath is unchanged . Left upper lobe granulomata and calcified hilar lymph nodes suggest prior granulomatous disease exposure .
    OUTPUT:
    
No acute intrathoracic process .