Fig. 18
From: Beyond bronchitis: a review of the congenital and acquired abnormalities of the bronchus
Bronchial obstruction due to granulomatous disease. a Axial CT image of sarcoidosis demonstrating perihilar lymphadenopathy (*) and pulmonary granulomas causing extrinsic compression of several left upper lobe segmental bronchi (arrows). b Axial CT imaging of granulomatosis with polyangitis demonstrates infiltrative changes of the pulmonary parenchyma in a perihilar/bronchovascular distribution causing narrowing of the associated bronchi in a bilateral upper lobe predominance with sparing of the apices. The associated ground-glass opacities suggest the presence of haemorrhage