LAUSR

ENDOSCOPIC ULTRASONOGRAPHY (EUS) is useful in observing gastrointestinal lesions in the esophagus, stomach, duodenum, rectum, and in the transgastric observation of jejunal lesions. Water injections are used to reduce the effect of gas in the gastrointestinal tract during EUS; however, they are difficult to administer due to anatomical factors or peristalsis. The utility of the gel immersion technique has been reported recently. Herein, we report a case in which a proximal jejunal lesion was clearly observed transgastrically using the gel immersion technique. A 50-year-old man complaining of abdominal pain had an 18 mm mass in the proximal jejunum, based on computed tomography (Fig. 1). EUS was attempted for a detailed examination. Initially, the lesion could not be identified because of air retention in the intestinal tract, and 200 mL of water was injected from the third part of the duodenum to obtain EUS images (Video S1). However, it was ineffective because only little water remained (Fig. 2a).