Endoscopic submucosal dissection (ESD) allows large-sized superficial gastric tumors
to be obtained en-bloc [1]. One of the technical problems in ESD is the difficulty of maintaining a clear view
of the submucosal layer of the gastric wall during the procedure. We report our experience
of ESD assisted by transgastrostomic endoscopy (TGE) in five patients with gastric
tumors (three well-differentiated adenocarcinoma, one adenoma, and one carcinoid tumor)
after percutaneous endoscopic gastrostomy.
A small-caliber endoscope, GIF XP-240 (Olympus Optical Co., Ltd, Tokyo, Japan), was
inserted through the mature gastrocutaneous tract, and the edge of the resecting specimen
was grasped to achieve counter-traction during submucosal dissection ([Fig. 1]).
Fig. 1 Schematic illustration of transgastrostomic endoscopy (TGE)-assisted endoscopic submucosal
dissection (ESD). A small-caliber endoscope is inserted through the mature gastrocutaneous
tract and creates counter-traction by grasping the edge of the resection specimen.
ESD was carried out under the counter-traction by TGE.
All tumors were resected successfully. The mean diameter of the resected specimens
was 29.8 mm, and the mean duration of the procedures was 55.8 minutes. [Fig. 2] shows a difficult case involving a carcinoid tumor.
Fig. 2 TGE-assisted ESD for carcinoid tumor on the anterior wall of the upper body. The submucosal
fibrosis was too severe to allow a sufficient submucosal cushion to be made by injection
with hyaluronic acid. Submucosal dissection was carefully conducted under the appropriate
counter-traction by TGE.
Although the submucosal fibrosis was too severe to allow a sufficient submucosal cushion
to be made by injection with hyaluronic acid, ESD was successfully carried out by
a Flex knife under the appropriate counter-traction of the resection specimen.
Percutaneous traction-assistance has been reported to be a useful method for endoscopic
mucosal resection (EMR). Hard-grasping forceps are inserted through the gastrocutaneous
tract, and conventional EMR is conducted [2]. A laparoscopic port with a trocar is inserted into the gastric lumen percutaneously
and assists in the ESD using an insulation-tipped (IT) knife [3]. However, these methods are thought to be limited depending on the location of the
tumor, as the assisting devices are not flexible. TGE can be applied throughout the
stomach and the esophagus, and can create appropriate counter-traction for dissecting
the lesion. Furthermore, TGE can provide not only traction control but also support
for diverse procedures of ESD, such as marking, submucosal injection, and washing
out or aspiration of the intragastric contents.
Endoscopy_UCTN_Code_TTT_1AO_2AG
