Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is upper limits of normal in size . The lungs are clear without pleural effusion or pneumothorax . There is left lung basilar pleural thickening . The hilar and mediastinal contours are unremarkable . Osseous structures are unremarkable . Incidental note is again made of a VP shunt catheter and surgical clips in the paratracheal region , likely from previous thyroid or parathyroid surgery .
    OUTPUT:
    
1 . No evidence of pulmonary TB . 2 . Small left basilar pleural thickening is unchanged since ___ .