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Dive into the research topics where Koichiro Matsuda is active.

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Featured researches published by Koichiro Matsuda.


World Journal of Gastroenterology | 2015

Gastric adenocarcinoma of fundic gland type: Five cases treated with endoscopic resection

Masaki Miyazawa; Mitsuru Matsuda; Masaaki Yano; Yasumasa Hara; Fumitaka Arihara; Yosuke Horita; Koichiro Matsuda; Akito Sakai; Yatsugi Noda

Recently, a new disease entity termed gastric adenocarcinoma of fundic gland type (GA-FG) was proposed. We treated five cases of GA-FG with endoscopic submucosal dissection. All tumors were small and located in the upper third of the stomach. Four tumors were macroscopically identified as 0-IIa and one was identified as 0-IIb. Narrow-band imaging with magnifying endoscopy showed an irregular microvascular pattern in 2 cases and a regular microvascular pattern in the remainder. All tumors arose from the deep layer of the lamina propria mucosae and showed submucosal invasion. Lymphatic invasion was seen only in one case, while no venous invasion was recognized. All tumors were positive for pepsinogen-I  and MUC6 by immunohistochemistry. None showed p53 overexpression, and the labeling index of Ki-67 was low in all cases. All cases have been free from recurrence or metastasis. Herein, we discussed the clinicopathological features of GA-FG in comparison with past reports.


Digestive Endoscopy | 2013

Endoscopic metallic stenting by double‐balloon enteroscopy and its overtube for malignant gastrointestinal obstruction as palliative treatment

Akihiko Kida; Koichiro Matsuda; Yatsugi Noda

1 Kuwatani M, Kawakami H, Sakamoto N. Carbon dioxide insufflation for endoscopic retrograde cholangiopancreatography: Is this beneficial for all patients? Dig. Endosc. 2013; 25: 205. 2 Muraki T, Arakura N, Kodama R et al. Comparison of carbon dioxide and air insufflation use by non-expert endoscopists during endoscopic retrograde cholangiopancreatography. Dig. Endosc. 2013; 25: 189–96. 3 Uraoka T, Kato J, Kuriyama M et al. CO2 insufflation for potentially difficult colonoscopies: Efficacy when used by less experienced colonoscopists. World J. Gastroenterol. 2009; 15: 5186–92.


World Journal of Gastroenterology | 2016

Gastric adenocarcinoma of the fundic gland (chief cell-predominant type): A review of endoscopic and clinicopathological features

Masaki Miyazawa; Mitsuru Matsuda; Masaaki Yano; Yasumasa Hara; Fumitaka Arihara; Yosuke Horita; Koichiro Matsuda; Akito Sakai; Yatsugi Noda

Gastric adenocarcinoma of the fundic gland (chief cell-predominant type, GA-FG-CCP) is a rare variant of well-differentiated adenocarcinoma, and has been proposed to be a novel disease entity. GA-FG-CCP originates from the gastric mucosa of the fundic gland region without chronic gastritis or intestinal metaplasia. The majority of GA-FG-CCPs exhibit either a submucosal tumor-like superficial elevated shape or a flat shape on macroscopic examination. Narrow-band imaging with endoscopic magnification may reveal a regular or an irregular microvascular pattern, depending on the degree of tumor exposure to the mucosal surface. Pathological analysis of GA-FG-CCPs is characterized by a high frequency of submucosal invasion, rare occurrences of lymphatic and venous invasion, and low-grade malignancy. Detection of diffuse positivity for pepsinogen-I by immunohistochemistry is specific for GA-FG-CCP. Careful endoscopic examination and detailed pathological evaluation are essential for early and accurate diagnosis of GA-FG-CCP. Nearly all GA-FG-CCPs are treated by endoscopic resection due to their small tumor size and low risk of recurrence or metastasis.


PLOS ONE | 2017

Prognosis of type 1 autoimmune pancreatitis after corticosteroid therapy-induced remission in terms of relapse and diabetes mellitus

Masaki Miyazawa; Hajime Takatori; Tetsuro Shimakami; Kazunori Kawaguchi; Kazuya Kitamura; Kuniaki Arai; Koichiro Matsuda; Taku Sanada; Takeshi Urabe; Katsuhisa Inamura; Takashi Kagaya; Hideki Mizuno; Uichiro Fuchizaki; Taro Yamashita; Yoshio Sakai; Tatsuya Yamashita; Eishiro Mizukoshi; Masao Honda; Shuichi Kaneko

Background and aim Relapse and diabetes mellitus (DM) are major problems for the prognosis of autoimmune pancreatitis (AIP). We examined the prognosis of type 1 AIP after corticosteroid therapy (CST)-induced remission in terms of relapse and DM. Methods The study enrolled 82 patients diagnosed with type 1 AIP who achieved remission with CST. We retrospectively evaluated the relapse rate in terms of the administration period of CST, clinical factors associated with relapse, and the temporal change in glucose tolerance. Results During follow-up, 32 patients (39.0%) experienced relapse. There was no significant clinical factor that could predict relapse before beginning CST. AIP patients who ceased CST within 2 or 3 years experienced significantly earlier relapse than those who had the continuance of CST (p = 0.050 or p = 0.020). Of the 37 DM patients, 15 patients (40.5%) had pre-existing DM, 17 (45.9%) showed new-onset DM, and 5 (13.5%) developed CST-induced DM. Patients with new-onset DM were significantly more likely to show improvement (p = 0.008) than those with pre-existing DM. Conclusions It was difficult to predict relapse of AIP based on clinical parameters before beginning CST. Relapse was likely to occur within 3 years after the beginning of CST and maintenance of CST for at least 3 years reduced the risk of relapse. The early initiation of CST for AIP with impaired glucose tolerance is desirable because pre-existing DM is refractory to CST.


Digestive Endoscopy | 2018

Successful endoscopic recanalization by combined antegrade-retrograde dilation for acquired complete esophageal obstruction in a child

Akihiko Kida; Koichiro Matsuda; Akito Sakai

A 29-day-old girl who was born by Cesarean section in Week-27 of pregnancy due to pregnancy-induced-hypertension, with a height and body weight of 30-cm and 556-g was referred to our hospital with frequent vomiting. As esophagogastroduodenoscopy revealed upper esophageal stenosis, gastrostomy was performed. Five months after birth, esophagogastroduodenoscopy showed membranous obstruction of upper esophagus (Figure.1A). This article is protected by copyright. All rights reserved.


SAGE open medical case reports | 2017

A unique case of massive gastrointestinal bleeding

Akihiko Kida; Koichiro Matsuda; Mitsuru Matsuda; Akito Sakai; Yatsugi Noda

Objectives: Lipomas are the second most common benign tumors of the small bowel, and most lipomas are asymptomatic. However, lipomas with diameters of >20 mm tend to be symptomatic, for example, to cause bleeding, obstructive jaundice, abdominal pain, intestinal obstruction, intussusception, and/or perforation. Methods/Results: We report a case of massive gastrointestinal bleeding from a jejunal lipoma combined with intussusception. A preoperative diagnosis of gastrointestinal bleeding derived from a jejunal lipoma combined with intussusception was made based on double-balloon enteroscopy and contrast-enhanced computed tomography, and partial resection of the small intestine was performed. After surgery, there was no additional gastrointestinal bleeding. Conclusion: There have only been a few reports about cases of jejunal lipoma involving simultaneous bleeding and intussusception. Double-balloon enteroscopy is useful for preoperatively diagnosing bleeding from a lipoma. Our case highlights that jejunal lipoma can cause massive unexplained gastrointestinal bleeding.


World Journal of Gastroenterology | 2012

A pedunculated polyp-shaped small-bowel lymphangioma causing gastrointestinal bleeding and treated by double-balloon enteroscopy.

Akihiko Kida; Koichiro Matsuda; Satoshi Hirai; Akiyoshi Shimatani; Yousuke Horita; Katsushi Hiramatsu; Mitsuru Matsuda; Hidero Ogino; Shin Ishizawa; Yatsugi Noda


Kanzo | 2010

Clinicopathological characteristics of surgically treated patients with non-B non-C type hepatocellular carcinoma

Tomoyuki Hayashi; Satoshi Hirai; Akiyoshi Shimatani; Yosuke Horita; Koichiro Matsuda; Katsushi Hiramatsu; Mitsuru Matsuda; Hidero Ogino; Kouichi Shimizu; Akio Uchiyama; Shintaro Terahata; Yatsugi Noda


Journal of Gastroenterology | 2017

Prospective randomized study of endoscopic biliary stone extraction using either a basket or a balloon catheter: the BasketBall study

Noritaka Ozawa; Ichiro Yasuda; Shinpei Doi; Takuji Iwashita; Masahito Shimizu; Tsuyoshi Mukai; Masanori Nakashima; Tesshin Ban; Issei Kojima; Koichiro Matsuda; Mitsuru Matsuda; Yusuke Ishida; Yoshinobu Okabe; Nobuhiro Ando; Keisuke Iwata


Anti-Cancer Drugs | 2018

Phase II clinical trial of second-line weekly paclitaxel plus trastuzumab for patients with HER2-positive metastatic gastric cancer

Yosuke Horita; Michiko Nishino; Saiho Sugimoto; Akihiko Kida; Atsuyoshi Mizukami; Masaaki Yano; Fumitaka Arihara; Koichiro Matsuda; Mitsuru Matsuda; Akito Sakai

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