However, CT cannot be used to rule out parenchymal involvement; HRCT can be normal in patients with pulmonary involvement by sarcoidosis proved by transbronchial biopsy.

• 然而HRCT不能完全除外（结节病）累及肺实质，部分经支气管镜活检证实肺实质受累的患者在HRCT上显示为正常。