INTRODUCTIONEUS-guided FNA (EUS-FNA) has emerged as an effective technique for tissue diagnosis in patients with abnormalities of various organs. For this reason, EUS-FNA is now frequently incorporated into the management algorithms of patients with suspected mediastinal or abdominal neoplasms. Moreover, interventional EUS has recently spread worldwide, not only for diagnostic intervention but also for therapeutic intervention. The use of EUS-FNA is fundamental in various interventional EUS, and learning the basic techniques of EUS-FNA is important to perform EUS-FNA with high efficacy. In this article, the basic EUS-FNA technique is interpreted by referring to the medical literature.1"4BASIC TECHNIQUE OF EUS-FNAOverviewThe EUS-FNA procedure necessitates the use of a linear-array echoendoscope and a needle-aspiration device. A handle attaches a sheath to the echoendoscope, and, through the sheath, a needle is placed through the endo-scope's instrument channel. After the target lesion is detected on an EUS view, the needling is performed through the GI wall. Lesions as small as 5 mm can be aspirated by using EUS guidance. Many reports describe a sensitivity around 90%, with a specificity around 96% for EUS-FNA.
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