Hilar and mediastinal adenopathy in sarcoidosis as detected by computed tomography.

CT of the chest was performed in 25 patients with chest radiographs suspicious for hilar or mediastinal adenopathy, who subsequently proved to have sarcoidosis. In each case, CT detected more extensive adenopathy than suspected on chest radiographs. Adenopathy greater than 1.0 cm was present in the right paratracheal and pretracheal regions in all cases. Adenopathy was also frequently seen in the hilar (92%), anteroposterior window (88%), subcarinal (64%), anterior mediastinal (48%), and posterior mediastinal (16%) lymph node groups. The adenopathy occurred in multiple and varying combinations without a consistent identifiable pattern suggestive of sarcoidosis. It is concluded that while CT detects adenopathy more consistently, it does not offer a clear advantage over chest radiography in confirming a diagnosis of mediastinal and hilar involvement by sarcoidosis.