CC BY-NC-ND 4.0 · Endosc Int Open 2018; 06(06): E652-E658
DOI: 10.1055/a-0577-3009
Original article
Owner and Copyright © Georg Thieme Verlag KG 2018

Recognition accuracy of tumor extent using a prototype 3D endoscope for superficial gastric tumor: an ex vivo crossover study

Kosuke Nomura
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Mitsuru Kaise
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Daisuke Kikuchi
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Toshiro Iizuka
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Yumiko Fukuma
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Yasutaka Kuribayashi
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Masami Tanaka
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Takahito Toba
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Tsukasa Furuhata
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Satoshi Yamashita
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Akira Matsui
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Toshifumi Mitani
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
,
Shu Hoteya
Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan
› Author Affiliations
Further Information

Publication History

submitted 19 August 2017

accepted after revision 03 January 2018

Publication Date:
25 May 2018 (online)

Abstract

Background and study aims Many studies have shown the utility of rigid three-dimensional (3 D) endoscopes in surgery, but few have reported the utility of flexible 3 D endoscopes. This ex vivo study was intended to investigate whether a newly developed 3 D endoscope (GIF-Y0083; Olympus) improves diagnostic accuracy for superficial gastric tumor.

Methods Twelve observers comprising experts, trainees, and novices (4 each) evaluated 2 D and 3 D images of 20 specimens resected by gastric ESD. Evaluation items were diagnostic accuracy of tumor extent and degree of confidence in assessing (a) tumor extent, (b) morphology, and (c) comprehensive recognition. The 2 D and 3 D endoscopy data were compared in a crossover analysis.

Results Overall, diagnostic accuracy was significantly higher with 3 D images (88.1 %) than with 2 D images (84.2 %) (P < 0.01). Comparison by skill level showed that 3 D images significantly improved diagnostic accuracy among novices but not among experts or trainees. Comparison by morphology showed that diagnostic accuracy did not differ significantly for type IIa/IIb lesions but improved significantly for type IIc lesions among trainees and novices. Overall, 3 D images significantly increased the degree of confidence in the assessment of all three items (a – c). Comparison by skill level showed similar results, and comparison by morphology showed that regardless of skill level, the degree of confidence in assessing all items (a – c) increased significantly only when examining type IIc lesions.

Conclusion Compared with 2 D images, 3 D images significantly improved both diagnostic accuracy of tumor extent and degree of confidence for diagnosing superficial gastric tumor. The utility of the 3 D endoscope was apparent among trainees and novices and for the diagnosis of type IIc lesions.