Thanks for your question on Healthcare Magic. I can understand your concern. Pleural thickening on chest x ray is suggestive of past infection. This thickening is due to old, scarred, healed, fibrotic lesions. They are not active, infectious lesions. For medical fitness in visa purpose, we should prove that these lesions are not due active infection. For this you need to consult pulmonologist and get done clinical examination of respiratory system, CT thorax and bronchoscopy with BAL (bronchoalveolar lavage) analysis. CT scan is more superior in diagnosis of fibrotic lesions. Bronchoscopy and BAL analysis if negative rule out active infection. So with negative BAL report and CT findings, you can argue with visa authority about not having active infectious disease and these thickening is due to old, healed lesion. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.