Endobronchial ultrasound (EBUS) mini radial probe image

A) The radial probe endobronchial ultrasound image demonstrates six distinct layers of the bronchial wall. Layers 1 and 2 are the mucosa, submucosa, and muscle. Layers 3 and 4 are the cartilage. Layers 5 and 6 are the adventitia. Layers 1, 3, and 5 appear hyperechoic because they are interfaces. B) Cross section of a normal bronchus.