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​Symptoms and Signs – Differential Diagnosis of Reticulonodular shadows {classified according to the lung zones in which they commonly occur)
Upper zone: allergic bronchopulmoary aspergillosis, radiation, extrinsic allergic
alveolitis, ankylosing spondylitis, sarcoidosis, TB (commonest)
Middle zone: sarcoidosis
Lower zone: cryptogenic fibrosing alveolitis, drugs, asbestosis, rheumatoid
arthritis, scleroderma
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