title: Navigational transbronchial needle aspiration, percutaneous needle aspiration and its future.
abstract: Peripheral lung nodule evaluation represents a clinical challenge. Given that many nodules will be incidentally found with lung cancer screening following the publication of the National Lung Screening Trial (NLST), the goal is to find an accurate, safe and minimally-invasive diagnostic modality to biopsy the concerning lesions. Unfortunately, conventional bronchoscopic techniques provide a poor diagnostic yield of 18-62%. In recent years advances in technology have led to the introduction of electromagnetic navigational bronchoscopy (ENB) as a tool to guide sampling of peripheral lung nodules. The same principle has also recently been expanded and applied to the transthoracic needle biopsy, referred to as electromagnetic transthoracic needle aspiration (E-TTNA). An improved diagnostic yield has afforded this technology a recommendation by the 2013 3(rd) Edition ACCP Guidelines for the Diagnosis and Management of Lung Cancer which state that "in patients with peripheral lung lesions difficult to reach with conventional bronchoscopy, ENB is recommended if the equipment and the expertise are available (Grade 1C)". In this review we will discuss the technology, devices that are available, techniques and protocols, diagnostic yield, safety, cost effectiveness and more.
authors.affiliation: 1 University of Miami, Interventional Pulmonology, Assistant Professor of Medicine, Pulmonary and Critical Care Medicine; 2 Johns Hopkins University, Interventional Pulmonology, Assistant Professor of Medicine, Pulmonary and Critical Care Medicine; 3 Division of Pulmonary and Critical Care, Assistant Professor of Medicine, Interventional Pulmonology, Northwestern University, Chicago, IL, USA.
authors.forename: Sixto
authors.initials: S
authors.lastname: Arias
authors.affiliation: 1 University of Miami, Interventional Pulmonology, Assistant Professor of Medicine, Pulmonary and Critical Care Medicine; 2 Johns Hopkins University, Interventional Pulmonology, Assistant Professor of Medicine, Pulmonary and Critical Care Medicine; 3 Division of Pulmonary and Critical Care, Assistant Professor of Medicine, Interventional Pulmonology, Northwestern University, Chicago, IL, USA.
authors.forename: Lonny
authors.initials: L
authors.lastname: Yarmus
authors.affiliation: 1 University of Miami, Interventional Pulmonology, Assistant Professor of Medicine, Pulmonary and Critical Care Medicine; 2 Johns Hopkins University, Interventional Pulmonology, Assistant Professor of Medicine, Pulmonary and Critical Care Medicine; 3 Division of Pulmonary and Critical Care, Assistant Professor of Medicine, Interventional Pulmonology, Northwestern University, Chicago, IL, USA.
authors.forename: A Christine
authors.initials: AC
authors.lastname: Argento
keywords: Lung nodule; electromagnetic bronchoscopy; transbronchial needle aspiration (TBNA); transthoracic needle aspiration (TTNA)