Table 1.

Chest radiographic staging of pulmonary and thoracic lymphoid involvement.

Stage	Observation
0	Normal chest radiograph
I	Bilateral hilar lymphadenopathy ± paratracheal lymphadenopathy. Despite no evidence of parenchymal infiltration, granulomas may be seen on lung biopsy
II	Bilateral hilar lymphadenopathy plus lung parenchymal infiltration
III	Pulmonary infiltration without hilar lymphadenopathy
IV	Pulmonary fibrosis, with evidence of honey-combing, hilar retraction, bullae, cysts and emphysema