<unk>  is a radiological technique, which involves x-raying the respiratory tree after coating the airways with contrast.<unk>  is rarely performed, as it has been made obsolete with improvements in computed tomography and bronchoscopy.
Bronchography
Bronchoscopy
Bronchial brushing
Thoracoscopy
Lung biopsy
Bronchial challenge test
Electromagnetic navigation bronchoscopy
Bronchoalveolar lavage