What are the radiologic stagings of sarcoidosis?

Stage 0 ->normal Stage I -> BHL without infiltrates Stage II -> BHL with infiltrate Stage III ->Infiltrate without intrathoracic adenopathies Stage IV -> Extensive detruction, fibrosis and volume loss Useful for prognosis (remission 60-90% stage I, 40-70% stage II and 10-20% stage III spontaneous) within first 6 months remission