<prompt> Egg shell calcification seen in silicosis is due toHilar lymphnode enlargementPleural thickeningPulmonary edemaDilated vessels  <response>: a Hilar lymphnode enlargement Enlargement of the hilum is common with chronic and accelerated silicosis. In about 5-10 of cases, the nodes will calcify circumferentially, producingso-called Eggshell calcification. This finding is not pathognomonic diagnostic of silicosis. In some cases, the pulmonary nodules may also become calcified. 