A Pilot Randomized Crossover Trial of Wet Suction and Conventional Techniques of Endoscopic Ultrasound-Guided Fine-Needle Aspiration for Upper Gastrointestinal Subepithelial Lesions

Figure 2

Wet technique of endoscopic ultrasonography-guided fine-needle aspiration.

(a) After the stylet of the needle was removed, saline was injected into the needle to replace the column of air

(b) A locked suction syringe with 20 mL of negative pressure was attached to the needle

(c) After the subepithelial tumor was punctured, the lock on the syringe was opened. The saline flowed into the suction syringe due to the negative pressure