<prompt> Egg-shell calcifications are seen inSilicosisBerylliosisAsbestosisBronchial asthma  <response>: Silicosis 499-HM5th 1523-H 498-Basic pathology 8thSILICOSIS - major occupational exposures include, mining, stone cutting, employment in abrasive industries such as stone, clay, glass and cement manufacturing foundry work, packing of silica flour. Calcification of hilar nodes may occur in as many as 20 of cases and produces the characteristic egg sheir pattern Patients with silicosis are greater risk of acquiring Mycobacterium tuberculosis Caplans syndrome - Pneumoconiosis, sero-positive, rheumatoid arthritis with characteritic progressive massive fibrosis PMF Berylliosis - characterised by non-caseating epitheloid like those of sarcoidosis Bronchogenic carcinoma is the most common malignancy in asbestos workers 