The TBNA needle should make an angle >45º with the airway wall.
Reproduced with permission from Minai, OA, Dasgupta, A, Mehta, AC. Transbronchial needle aspiration of central and peripheral lesions. In: Bolliger, CT, Mathur, PN (Eds), Progress in Respiratory Research-Interventional Bronchoscopy. Karger, Basel, Switzerland, 1999.
