Clinical Endoscopy

Kentaro Imamura

5 Articles

Clinicopathological and endoscopic features of Helicobacter pylori infection-negative gastric cancer in Japan: a retrospective study: Kentaro Imamura, Kenshi Yao, Satoshi Nimura, Takao Kanemitsu, Masaki Miyaoka, Yoichiro Ono, Toshiharu Ueki, Hiroshi Tanabe; Clin Endosc 2024;57(4):486-494. Published online March 22, 2024; DOI: https://doi.org/10.5946/ce.2023.258

Graphical Abstract Abstract PDF PubReader ePub

Background
/Aims: Helicobacter pylori infection-negative gastric cancer (HPNGC) has not been systematically investigated in consecutive patients. Hence, this study aimed to investigate the clinicopathological and endoscopic features of HPNGC.
Methods
This single-center retrospective study selected participants from patients with gastric cancer who were treated at the Fukuoka University Chikushi Hospital between January 2013 and December 2021. Only patients diagnosed with HPNGC were enrolled, and their clinicopathological and endoscopic features were analyzed in detail.
Results
The prevalence of HPNGC in the present study was 2.6% (54/2112). The types of HPNGC observed in each gastric region were as follows: advanced gastric cancer was observed in the cardia; gastric adenocarcinoma of fundic-gland differentiation, gastric adenocarcinoma of foveolar-type presenting with whitish elevation and raspberry-like foveolar-type gastric adenocarcinoma, gastric adenocarcinoma arising in polyposis, and gastric adenocarcinoma with autoimmune gastritis were observed in the fundic gland region ranging from the gastric fornix to the gastric body; signet-ring cell carcinoma was observed in the gastric-pyloric transition region ranging from the lower gastric body to the gastric angle; and well-differentiated tubular adenocarcinoma with low-grade atypia was observed in the antrum.
Conclusions
This study revealed that tumors from each gastric region exhibited distinct macroscopic and histological types in HPNGC.

Citations

Citations to this article as recorded by

Is your endoscopist qualified enough to detect Helicobacter pylori-naive status?
Sun-Young Lee
Clinical Endoscopy.2024; 57(4): 466. CrossRef

3,647 View
267 Download
1 Web of Science
1 Crossref

Association between occurrence of multiple white and flat elevated gastric lesions and oral proton pump inhibitor intake: Rino Hasegawa, Kenshi Yao, Takao Kanemitsu, Hisatomi Arima, Takayuki Hirase, Yuuya Hiratsuka, Kazuhiro Takeda, Kentaro Imamura, Kensei Ohtsu, Yoichiro Ono, Masaki Miyaoka, Takashi Hisabe, Toshiharu Ueki, Hiroshi Tanabe, Atsuko Ohta, Satoshi Nimura; Clin Endosc 2024;57(1):65-72. Published online May 9, 2023; DOI: https://doi.org/10.5946/ce.2022.257

Graphical Abstract Abstract PDF Supplementary Material PubReader ePub

Background
/Aims: Multiple white and flat elevated lesions (MWFL) that develop from the gastric corpus to the fornix may be strongly associated with oral antacid intake. Therefore, this study aimed to determine the association between the occurrence of MWFL and oral proton pump inhibitor (PPI) intake and clarify the endoscopic and clinicopathological characteristics of MWFL.
Methods
The study included 163 patients. The history of oral drug intake was collected, and serum gastrin levels and anti-Helicobacter pylori immunoglobulin G antibody titers were measured. Upper gastrointestinal endoscopy was performed. The primary study endpoint was the association between MWFL and oral PPI intake.
Results
In the univariate analyses, MWFL were observed in 35 (49.3%) of 71 patients who received oral PPIs and 10 (10.9%) of 92 patients who did not receive oral PPIs. The occurrence of MWFL was significantly higher among patients who received PPIs than in those who did not (p<0.001). Moreover, the occurrence of MWFL was significantly higher in patients with hypergastrinemia (p=0.005). In the multivariate analyses, oral PPI intake was the only significant independent factor associated with the presence of MWFL (p=0.001; odds ratio, 5.78; 95% confidence interval, 2.06–16.2).
Conclusions
Our findings suggest that oral PPI intake is associated with the presence of MWFL (UMINCTR 000030144).

Citations

Citations to this article as recorded by

Endoscopic findings and outcomes of gastric mucosal changes relating to potassium‐competitive acid blocker and proton pump inhibitor therapy
Satoshi Shinozaki, Hiroyuki Osawa, Yoshimasa Miura, Hiroaki Nomoto, Hirotsugu Sakamoto, Yoshikazu Hayashi, Tomonori Yano, Edward J. Despott, Hironori Yamamoto
DEN Open.2025;[Epub] CrossRef
Clinicians should be aware of proton pump inhibitor–related changes in the gastric mucosa
Gwang Ha Kim
Clinical Endoscopy.2024; 57(1): 51. CrossRef
Drug-induced mucosal alterations observed during esophagogastroduodenoscopy
Masaya Iwamuro, Seiji Kawano, Motoyuki Otsuka
World Journal of Gastroenterology.2024; 30(16): 2220. CrossRef

3,254 View
205 Download
2 Web of Science
3 Crossref

Efficacy of endoscopy under general anesthesia for the detection of synchronous lesions in oro-hypopharyngeal cancer: Yoichiro Ono, Kenshi Yao, Yasuhiro Takaki, Satoshi Ishikawa, Kentaro Imamura, Akihiro Koga, Kensei Ohtsu, Takao Kanemitsu, Masaki Miyaoka, Takashi Hisabe, Toshiharu Ueki, Atsuko Ota, Hiroshi Tanabe, Seiji Haraoka, Satoshi Nimura, Akinori Iwashita, Susumu Sato, Rumie Wakasaki; Clin Endosc 2023;56(3):315-324. Published online January 5, 2023; DOI: https://doi.org/10.5946/ce.2022.072

Graphical Abstract Abstract PDF PubReader ePub

Background
/Aims: Image-enhanced endoscopy can detect superficial oro-hypopharyngeal squamous cell carcinoma; however, reliable endoscopy of the pharyngeal region is challenging. Endoscopy under general anesthesia during transoral surgery occasionally reveals multiple synchronous lesions that remained undetected on preoperative endoscopy. Therefore, we aimed to determine the lesion detection capability of endoscopy under general anesthesia for superficial oro-hypopharyngeal squamous cell carcinoma.
Methods
This retrospective study included 63 patients who underwent transoral surgery for superficial oropharyngeal squamous cell carcinoma between April 2005 and December 2020. The primary endpoint was to compare the lesion detection capabilities of preoperative endoscopy and endoscopy under general anesthesia. Other endpoints included the comparison of clinicopathological findings between lesions detected using preoperative endoscopy and those newly detected using endoscopy under general anesthesia.
Results
Fifty-eight patients (85 lesions) were analyzed. The mean number of lesions per patient detected was 1.17 for preoperative endoscopy and 1.47 for endoscopy under general anesthesia. Endoscopy under general anesthesia helped detect more lesions than preoperative endoscopy did (p<0.001). The lesions that were newly detected on endoscopy under general anesthesia were small and characterized by few changes in color and surface ruggedness.
Conclusions
Endoscopy under general anesthesia for superficial squamous cell carcinoma is helpful for detecting multiple synchronous lesions.

Citations

Citations to this article as recorded by

Nasopharyngeal examination during transoral upper gastrointestinal endoscopy
Vui Heng Chong
Clinical Endoscopy.2024; 57(1): 137. CrossRef
Endoscopy under general anesthesia for detecting synchronous lesions of head and neck squamous cell carcinoma
Jin Hee Noh, Do Hoon Kim
Clinical Endoscopy.2023; 56(3): 308. CrossRef

2,633 View
200 Download
2 Web of Science
2 Crossref

White Opaque Substance, a New Optical Marker on Magnifying Endoscopy: Usefulness in Diagnosing Colorectal Epithelial Neoplasms: Kazutomo Yamasaki, Takashi Hisabe, Kenshi Yao, Hiroshi Ishihara, Kentaro Imamura, Tatsuhisa Yasaka, Hiroshi Tanabe, Akinori Iwashita, Toshiharu Ueki; Clin Endosc 2021;54(4):570-577. Published online January 13, 2021; DOI: https://doi.org/10.5946/ce.2020.205

Abstract PDF PubReader ePub

Background
/Aims: A white substance that is opaque to endoscopic light is sometimes observed in the epithelium during narrowband imaging with magnifying endoscopy of gastric or colorectal epithelial neoplasms. This prospective observational study aimed to determine whether the morphology of the white opaque substance (WOS) allows differential diagnosis between colorectal adenoma and carcinoma.
Methods
A consecutive series of patients with colorectal adenomas or early carcinomas who underwent endoscopic resection or surgical excision were studied. The morphology of the WOS was determined based on endoscopic images before the histopathological diagnosis was performed. The primary outcome was the diagnostic performance of an irregular WOS as a marker of colorectal carcinoma.
Results
The study analyzed 125 lesions. A total of 33 lesions showed an irregular WOS, and 92 lesions showed a regular WOS. Among the 33 lesions found to show an irregular WOS, 30 were carcinomas. Among the 92 lesions showing a regular WOS, 79 were adenomas. With irregular WOS as a marker of carcinoma, the diagnostic accuracy was 87%, sensitivity was 91%, and specificity was 86%.
Conclusions
This study demonstrated the potential usefulness of the morphology of the WOS as a marker for the differential diagnosis between adenoma and carcinoma in cases of colorectal epithelial neoplasms.

Citations

Citations to this article as recorded by

Emergence of a New Optical Marker for Colorectal Neoplasms: To What Extent Should We Accept It?
Han Hee Lee
Clinical Endoscopy.2022; 55(2): 315. CrossRef

4,652 View
132 Download
2 Web of Science
1 Crossref

Histological Architecture of Gastric Epithelial Neoplasias That Showed Absent Microsurface Patterns, Visualized by Magnifying Endoscopy with Narrow-Band Imaging: Kenta Chuman, Kenshi Yao, Takao Kanemitsu, Takashi Nagahama, Masaki Miyaoka, Haruhiko Takahashi, Kentaro Imamura, Rino Hasegawa, Toshiharu Ueki, Hiroshi Tanabe, Seiji Haraoka, Akinori Iwashita; Clin Endosc 2021;54(2):222-228. Published online November 24, 2020; DOI: https://doi.org/10.5946/ce.2020.090

Abstract PDF PubReader ePub

Background
/Aims: The objective of this study was to elucidate the histological structure of the absent microsurface patterns (MSPs) that were visualized by magnifying endoscopy with narrow-band imaging (M-NBI).
Methods
The study included consecutive gastric epithelial neoplasias for which M-NBI findings and histological findings could be compared on a one-to-one basis. The lesions were classified as absent MSPs and present MSPs based on the findings obtained using M-NBI. Of the histopathological findings for each lesion that corresponded to M-NBI findings, crypt opening densities, crypt lengths, crypt opening diameters, intercrypt distances, and crypt angles were measured and compared.
Results
Thirty-six lesions were included in the analysis; of these, 17 lesions exhibited absent MSP and 19 lesions exhibited present MSP. Comparing the histological measurements for absent MSPs vs. present MSPs, median crypt opening density was 0.9 crypt openings/mm vs. 4.8 crypt openings/mm (p<0.001), respectively. The median crypt length, median crypt opening diameter, median intercrypt distance, and median crypt angle were 80.0 μm vs. 160 μm (p<0.001), 40.0 μm vs. 44.2 μm (p=0.09), 572.5 μm vs. 166.7 μm (p<0.001), and 21.6 degrees vs. 15.5 degrees (p<0.001), respectively.
Conclusions
Histological findings showed that lesions exhibiting absent MSPs had lower crypt opening density, shorter crypt length, greater intercrypt distance, and larger crypt angle.

Citations

Citations to this article as recorded by

The staining results of early gastric cancer by indigo carmine chromoendoscopy associated with histological structure: a retrospective study
Xiaosa Jiang, Lingzhi Qin, Yujie Hao, Qian Yang, Yueqin Zheng, Baicang Zou, Lei Dong, Na Liu, Jinhai Wang, Bin Qin
BMC Cancer.2024;[Epub] CrossRef
Magnifying Endoscopy with Narrow-Band Imaging for Duodenal Neuroendocrine Tumors
Gwang Ha Kim, Kiyoun Yi, Dong Chan Joo, Moon Won Lee, Hye Kyung Jeon, Bong Eun Lee
Journal of Clinical Medicine.2023; 12(9): 3106. CrossRef

4,610 View
145 Download
2 Web of Science
2 Crossref

Author index