Johns Hopkins Manual for GI Endoscopic Nurses, Third Edition

Mouen Khashab, MD; Toshunia Robinson, MD; Anthony Kalloo, MD

Chapter 23: Eus With Fine Needle Aspiration (continued)

Anne Marie Lennon, MD

Fine needle aspiration (FNA) allows the physician to obtain cells for cytopathological examination. The procedure is performed with a linear array echoendoscope. The lesion is located using the linear echoendoscope. Doppler ultrasound is used to insure that there are no vessels between the EUS scope and the lesion. An EUS needle is then passed through the biopsy channel of the endoscope and into the lesion to obtain cells. New EUS needles have been developed that can obtain a core of tissue rather than cells and are used if a large tissue sample is needed.