pleural parenchymal thickeningchronic pleural parenchymalpleural parenchymal changesbasilar pleural parenchymal diseaseapical pleural parenchymalbiapical pleuralpleural parenchymal scarringapical pleural parenchymal thickeningpleural parenchymal scarring lungbasilar pleural parenchymal scarringminimal biapical pleural thickeningapical pleural parenchymal scarring