Table 1.

Features and Frequency of Pulmonary Sarcoidosis Stages

Stage	Radiographic features	Frequency at presentation (%)7, 10, 13
I	Mediastinal and hilar adenopathy (usually bilateral) without pulmonary infiltrates	40-50
II	Mediastinal and hilar adenopathy (usually bilateral) with pulmonary infiltrates	30-40
III	Pulmonary infiltrates without adenopathy (adenopathy already regresses)	15-20
IV	Pulmonary fibrosis with volume loss. No adenopathy	2-5