pleural thickening causesbiapical pleural thickeningpleural thickening with calcificationpleural parenchymal thickeningpleural thickening compensationcalcified pleural thickeningirregular pleural thickeningresidual pleural thickeningminimal pleural thickeningpleural effusion thickeningbilateral pleural thickeningchronic pleural thickening