Pulmonary sarcoidosis is classified on a chest radiograph into 5 stages based on Scadding criteria:- Stage 0: Normal chest radiograph Stage I: Hilar or mediastinal nodal enlargement only Stage II: Nodal enlargement and parenchymal disease Stage III: Parenchymal disease only Stage IV: End-stage lung (pulmonary fibrosis) Rest 3 scoring systems are used for the assessment of Cystic fibrosis.