Although current diagnostic approaches include pulmonary function testing which shows a characteristic reduction in peak expiratory flow (PEF), physical examination, and imaging such as computed tomography (CT) or magnetic resonance imaging (MRI), fiberoptic bronchoscopy (FB) is considered the best diagnostic method because an inserted camera down the throat shows a direct view of the airways and lungs, detecting changes in the size or appearance of the trachea's lumen and mucosa and any signs of inflammation, fistulas, or external compressions to precisely determine the location and severity of the malacia.