Yasuhiko Hamada

Inverted Meckel’s diverticulum in adults: two case reports and a systematic review

Yasuhiko Hamada, Yohei Ikenoyama, Aiji Hattori, Noriyuki Horiki et autres

Inverted Meckel’s diverticulum (IMD) is a rare condition that may present as adult intussusception or as an intraluminal small-bowel lesion. Because its clinical and radiological features are nonspecific, IMD is frequently misdiagnosed preoperatively as a small-bowel tumor or another lead-point lesion. This …

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An unusual gastric mass in a patient with human immunodeficiency virus infection

Aiji Hattori, Yasuhiko Hamada, Hayato Nakagawa

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Hybrid-argon plasma coagulation for superficial esophageal cancer at risk of airway obstruction: a case report

Junki Toyoda, Aiji Hattori, Yohei Ikenoyama, Misaki Nakamura et autres

Endoscopic submucosal dissection (ESD) is the standard treatment for superficial esophageal squamous cell carcinoma (ESCC). However, this procedure is associated with complications and a relatively long procedure time [ 1 ]. Argon plasma coagulation (APC) is a technically simple treatment for ESCC, …

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Endoscopic submucosal dissection including the papilla for a duodenal adenoma using a high-pressure injection knife

Yohei Ikenoyama, Reiko Yamada, Misaki Nakamura, Yasuhiko Hamada et autres

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Broadening of Allergen-Specific IgG4 by Japanese Cedar Pollen and House Dust Mite Immunotherapy

Tomoyuki Soma, Kazuyuki Nakagome, Yoshitaka Uchida, Hidetoshi Iemura et autres

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Effects of allergen immunotherapy on non-targeted allergen-induced immune responses

Kazuyuki Nakagome, Tomoyuki Soma, Takahiro Uchida, Ryu Sekiya et autres

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Propensity Score-matched Analysis of the Impact of Direct-acting Oral Anticoagulants on Fecal Immunochemical Test Performance

Yasuhiko Hamada, Akina Shigefuku, Hiroto Suzuki, Aiji Hattori et autres

Objectives: The fecal immunochemical test (FIT) is widely used for colorectal cancer (CRC) screening, owing to its high diagnostic accuracy. Antithrombotic medications, particularly direct-acting oral anticoagulants (DOACs), can influence FIT performance; however, the evidence concerning this phenomenon remains inconsistent in the literature. …

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Long-term use of potassium-competitive acid blockers and proton pump inhibitors and the risk of metachronous gastric cancer after H. pylori eradication: a multicenter cohort study

Yasutoshi Shiratori, Yuntae Kim, Katsuyuki Fukuda, Nobumi Suzuki et autres

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Successful Chemotherapy Induction Following Management of Obstructive Jaundice and Femoral Pathological Fracture in Extensive‐Stage Small Cell Lung Cancer: A Case Report

Naohito Hashimoto, Yoshiaki Nagai, Yasuhiko Hamada, Tatsuhiko Uno et autres

Patients with poor Eastern Cooperative Oncology Group performance status (ECOG PS) ≥ 3 may be considered for systemic chemotherapy when the decline is driven by reversible tumour-related factors, but assessing reversibility is often difficult, and some patients ultimately receive best supportive care. …

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Magnifying Endoscopic Classification for Early Barrett’s Neoplasia

Yohei Ikenoyama, Aiji Hattori, Yasuko Fujiwara, Misaki Nakamura et autres

BACKGROUND: Barrett's esophagus (BE) is becoming increasingly prevalent in both Western countries and Japan. Early diagnosis of Barrett's neoplasia remains challenging. Traditionally, the Seattle protocol, a four-quadrant random biopsy method, has been recommended in Western guidelines. However, this approach has several limitations, …

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Hybrid argon plasma coagulation for chronic radiation-induced proctitis following pelvic chemoradiotherapy for cervical adenocarcinoma: a case report

Aiji Hattori, Yohei Ikenoyama, Yasuko Fujiwara, Misaki Nakamura et autres

Chronic radiation-induced proctitis is a common complication of pelvic radiotherapy that frequently presents with rectal bleeding and mucosal friability. Argon plasma coagulation (APC) is considered the first-line treatment for this condition [ 1 ]; however, it is associated with complications, such as …

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Follicular Lymphoma Manifesting as an Isolated Colorectal Polyp‐Like Morphology

Yasuhiko Hamada, Yuhei Umeda, Hayato Nakagawa

Background: Primary gastrointestinal (GI) follicular lymphoma (FL) is a rare entity, and colorectal FL presenting as a solitary polyp is particularly uncommon. Case Presentation: A 60-year-old woman presented with hematochezia. Colonoscopy incidentally identified an 8-mm polyp in the transverse colon, which was …

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