Gel immersion endoscopy for evaluation of a gastric submucosal tumor during endoscopic ultrasound-guided fine-needle aspiration

Gel immersion is a well-known and useful method for performing endoscopic procedures. Viscoclear gel (Otsuka Pharmaceutical Factory, Tokushima, Japan) is used to secure the visual field and prevent rapid runoff through the appropriate viscosity [1]. After injection of the clear gel, instead of water, into the gastrointestinal lumen, the visual field can be secured within the space occupied by the gel. We present the evaluation and diagnosis of a gastric submucosal tumor using endoscopic ultrasound (EUS) and the gel immersion method. We considered that, unlike water, the gel helped effectively visualize the gastric submucosal tumor on EUS ([Video 1]).