<prompt> On chest radiology, egg-shell calcification is seen in:AsbestosisSilicosisCoal-worker pneumoconiosisBerylliosis  <response>: SilicosisGrinders diseaseSand blasting disease : Most common pneumoconiosis Due to inhalation of quaz crystals SiO2 Nodules seen in hilar lympho nodes and upper lobes of lung Increased risk of TB malignancy CXR - Egg shell calcification calcification on hilar LN Histologic examination reveals the hallmark lesion characterized by a central area of whorled collagen fibers with a more peripheral zone of dust-laden macrophages. 