Doppler Ultrasound of Mediastinal Lymph Nodes

Scientific evidence and principles for the use of endobronchial ultrasound and transbronchial needle aspiration

Endobronchial ultrasound (EBUS), using the radial EBUS probe and convex-probe EBUS-guided transbronchial needle aspiration, are increasingly advocated for a wide array of minimally invasive thoracic procedures. The effectiveness of EBUS-guided procedures has been demonstrated to a degree that, in many institutions, EBUS is becoming standard of practice for the diagnosis, staging and restaging of mediastinal lymphadenopathy in lung cancer, the diagnosis of sarcoidosis, and for bronchoscopic biopsy of peripheral lung lesions. Its role in other bronchoscopic procedures requires further study despite an already strong body of literature: diagnosis of lymphoma and benign infectious disease, diagnosis of early lung cancer and airway wall disorders, imaging of thoracic vascular disease such as pulmonary embolism, and therapeutic procedures such as placement of fiducial markers. In this article, we illustrate some of the principles of EBUS, describe major technical aspects pertaining to the procedure itself and provide a narrative review of original research addressing proposed roles of EBUS in a variety of indications. In closing, we describe future perspectives including new educational processes and philosophies that could favorably impact the rapid and safe dissemination of this evolving technology into clinical practice.