Colorectal endoscopic submucosal dissection (ESD) is technically difficult and involves
long procedure times with the risk of perforation because of the thinness of the muscularis
propria and the poor maneuverability of the endoscope [1]
[2]. Magnetic anchor-guided (MAG) systems using neodymium magnets have been reported
to be useful in resolving the difficulties of ESD [3]
[4]. However, a remaining problem with this procedure has been the inability to deliver
the magnetic anchor through the scope [5].
A 69-year-old woman was referred to our hospital for a laterally spreading tumor in
the ascending colon ([Fig. 1]). As the first step, after injection of saline into the submucosa, a circumferential
mucosal incision was made using the Endosaber (Sumitomo
Bakelite, Tokyo, Japan) ([Fig. 2]). Next, a stainless steel anchor connected to an endoclip (Zeoclip; Zeon Medical
Inc., Tokyo, Japan) ([Fig. 3 a]) was attached to the proximal mucosal edge of the lesion without retrieving and
reinserting the endoscope as would be required in conventional MAG-ESD. The external
neodymium magnet was locked on to a flexible arm (FA-M-VC2; SFC Co. Ltd., Kanagawa,
Japan) that allowed it to be held in position during ESD, supported by an assistant
([Fig. 3 b]). The desired countertraction with good visualization was obtained using this external
magnet, and the submucosal dissection was performed ([Fig. 4]). Thus, performance of MAG-ESD using a neodymium magnet and a stainless steel anchor
was successful in this colonic case ([Video 1]). The patient was discharged without adverse events. The procedure time was less
than 30 minutes. The histopathological diagnosis was adenoma.
Fig. 1 Endoscopic image of the lesion in the ascending colon.
Fig. 2 After partial dissection: mucosal edge of the lesion before attachment of the stainless
steel anchor.
Fig. 3 a, b Magnetic anchor-guided endoscopic submucosal dissection using a stainless steel anchor.
a The stainless steel anchor attached with thread to an endoclip. b The external magnet attached to a flexible arm.
Fig. 4 Direct visualization of the submucosal layer enabled by traction using the stainless
steel anchor.
Video 1 Magnetic anchor-guided endoscopic submucosal dissection in a colonic case using a
stainless steel anchor.
The feasibility of this technique should be assessed in a variety of anatomic locations.
Clinical trial registration number: UMIN000036360.
Endoscopy_UCTN_Code_TTT_1AQ_2AD
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