CXR stages of sarcoidosis:
♥ Stage 0: no demonstrable abnormality. (10%)
♥ Stage 1: hilar and mediastinal LN enlargement unassociated with pulmonary abnormality (50%).
♥ Stage 2: hilar and mediastinal LN enlargement associated with pulmonary abnormality. (30%)
♥ Stage 3: diffuse pulmonary disease unassociated with node enlargement.
♥ Stage 4: Fibrosis
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