Lung cancer often spreads to the lymph nodes ... In people with N1 disease, outcomes are better if the affected lymph nodes are in the hilar zone rather than the peripheral zone.

Hilar and/or paratracheal lymph nodes may be involved ... The appearance of the primary lung cancer (not visible in all cases) is often a large mass, which is unusual in sarcoidosisosis.

Although the lungs appear clear on chest radiographs ... calcifications in mediastinal and hilar lymph nodes, and osseous changes. CT and high-resolution CT techniques are superior to chest ...