Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Koji Amaya is active.

Publication


Featured researches published by Koji Amaya.


International Surgery | 2015

Hybrid Laparoscopic and Anterior Approach for Postsurgical Inguinal Hernia After Iliofemoral Arterial Bypass

Tomoya Tsukada; Hiroto Saito; Koji Amaya; Itsuro Terada; Masahide Kaji; Koichi Shimizu

Laparoscopic hernia repair has become popular due to its rapid recovery time, fewer postoperative complications, and less chronic pain compared with conventional approaches. Currently, laparoscopic hernia repair is also used for more complex pathogenesis, including extra-anatomic bypass surgery for femoral artery. To the best of our knowledge, cases of inguinal hernia after femoral arterial bypass are extremely rare. We report the case of a 77-year-old Japanese man who was diagnosed with inguinal hernia after a previous left external iliac artery-right common femoral artery bypass. We used a hybrid laparoscopic and anterior approach, and the procedure was completed successfully without perioperative complications. A laparoscopic approach is useful for the diagnosis and treatment of inguinal hernia after extra-anatomic bypass surgery for femoral artery. While complicated, the addition of anterior reinforcement should be considered in cases of insufficient preperitoneal repair using transabdominal preperitoneal patch plasty.


International Journal of Surgery Case Reports | 2014

Single-incision laparoscopic appendectomy for treating appendicitis in a patient with gastrointestinal malrotation

Tomoya Tsukada; Masahide Kaji; Yuki Higashi; Shiro Terai; Koji Amaya; Koichi Shimizu

INTRODUCTION Intestinal malrotation is a rare congenital anomaly, and acute appendicitis associated with intestinal malrotation is extremely rare. PRESENTATION OF CASE We report a rare case of a 47-year-old Japanese woman diagnosed with barium-related perforated appendicitis associated with intestinal malrotation. We used a transumbilical single-incision laparoscopic approach to resect the appendix, and the procedure was completed successfully without perioperative complications. DISCUSSION To our knowledge, single-incision laparoscopic surgery for appendicitis associated with intestinal malrotation has not been reported yet. In cases with mobile cecum such as this one, mobilization from inflammatory adhesion of the surrounding structures is easy. CONCLUSION We conclude that transumbilical single-incision laparoscopic appendectomy is a simple and less invasive method for treating appendicitis associated with intestinal malrotation.


Annals of Vascular Diseases | 2018

Superior Mesenteric Artery–Pancreaticoduodenal Arcade Bypass Grafting for Repair of Inferior Pancreaticoduodenal Artery Aneurysm with Celiac Axis Occlusion

Akira Murata; Koji Amaya; Kentaro Mochizuki; Masami Sotokawa; Shingo Otaka; Kazuhiro Tani; Shota Nakagaki; Tetsuyuki Ueda

We report a case of an aneurysm of the inferior pancreaticoduodenal artery (IPDA), with chronic occlusion of the celiac axis. Both surgical aneurysmectomy and endovascular coil embolization were anticipated to sacrifice IPDA, which could lead to severe acute ischemia in the celiac region. The treatment involved surgical ligation of the aneurysm after bypass grafting from the superior mesenteric artery to the anterior IPDA. A postoperative computed tomography revealed no enhancement of the aneurysm and sufficient collateral blood supply by the patent bypass graft.


International Journal of Oncology | 2004

Angiotensin II activates MAP kinase and NF-κB through angiotensin II type I receptor in human pancreatic cancer cells

Koji Amaya; Tetsuo Ohta; Hirohisa Kitagawa; Masato Kayahara; Hiroyuki Takamura; Takashi Fujimura; Genichi Nishimura; Koichi Shimizu; Koichi Miwa


Journal of the Pancreas | 2008

A Case of Pancreatic Cancer with Formation of a Mass Mimicking Alcoholic or Autoimmune Pancreatitis in a Young Man. Possibility of Diagnosis by Hypermethylation of Pure Pancreatic Juice

Koushiro Ohtsubo; Hiroyuki Watanabe; Gensaku Okada; Tomoya Tsuchiyama; Hisatsugu Mouri; Yasushi Yamaguchi; Yoshiharu Motoo; Takashi Okai; Koji Amaya; Hirohisa Kitagawa; Tetsuo Ohta; Toshifumi Gabata; Koichiro Matsuda; Hideki Ohta; Norio Sawabu


World Journal of Surgical Oncology | 2017

Sclerosing mesenteritis mimicking metachronous peritoneal metastases from descending colon adenocarcinoma

Toshifumi Watanabe; Shiro Terai; Tomoya Tsukada; Masaki Takeshita; Koshi Matsui; Koji Amaya; Masahide Kaji; Kiichi Maeda; Koichi Shimizu; Junko Saito; Kentaro Mochizuki; Akio Uchiyama


The Japanese Journal of Gastroenterological Surgery | 2017

Intraductal Dissemination of Bile Duct Carcinoma with Pancreaticobiliary Maljunction in the Pancreatic Duct after Pancreatoduodenectomy

Yuki Higashi; Koichi Shimizu; Toshifumi Watanabe; Shiro Terai; Youhei Kawahara; Koji Amaya; Itsuro Terada; Seiichi Yamamoto; Masahide Kaji; Kiichi Maeda; Akio Uchiyama; Shin Ishizawa


Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2014

Laparoscopic Treatment of a Parastomal Hernia Using the Mesh-Lap-Sugarbaker Method—A Case Report—

Toru Watanabe; Itsuro Terada; Koji Amaya; Seichi Yamamoto; Masahide Kaji; Koichi Shimizu


Nihon Gekakei Rengo Gakkaishi (journal of Japanese College of Surgeons) | 2014

A Case of Gastrointestinal Stromal Tumor of the Stomach with Lymph Node Metastasis Treated with Laparoscopic and Endoscopic Cooperative Surgery

Jun Kinoshita; Masahide Kaji; Kentaro Sakurai; Yohei Kawahara; Koji Amaya; Ituro Terada; Seiichi Yamamoto; Kiichi Maeda; Koichi Shimizu


Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2013

A Case of Gastric Cancer with Positive Lavage Cytology (CY) with Recurrence 13 Years after the Initial Operation

Hirofumi Terakawa; Koji Amaya; Seiichi Yamamoto; Masahide Kaji; Kiichi Maeda; Koichi Shimizu

Collaboration


Dive into the Koji Amaya's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge