Radiographic Type	Radiographic Characteristics
0	No visible findings
I	Bilateral hilar lymphadenopathy
II	Bilateral hilar lymphadenopathy and parenchymal infiltration
III	Parenchymal infiltration without hilar adenopathy in regular chest radiography
IV	Advanced fibrosis with severe distortion of the normal lung architecture predominately in the middle and upper lobes with evidence of bronchiectasis, hilar retraction, bulla, cysts and more rarely “honeycombing”