Chikashi Hiranuma

Influence of Anatomical Variations due to Horseshoe Kidney on Colorectal Cancer Surgery

Tetsuhiro Urashima, Yasuhiro Ishiyama, Sohei Akuta, Akihito Nakanishi et autres

BackgroundHorseshoe kidney is a rare renal fusion anomaly often associated with vascular and ureteral variations. Previous case reports have described technical considerations during colectomy in patients with horseshoe kidney. However, studies systematically evaluating the impact of anatomical anomalies associated with horseshoe kidney …

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Prognostic value of D3 lymph node dissection and nutritional status in colorectal cancer patients aged 80 years and older

Yasuhiro Ishiyama, Yasumitsu Hirano, Sohei Akuta, Yume Minagawa et autres

PURPOSE: To evaluate the impact of D3 lymph node dissection and nutritional status on outcomes in patients aged ≥80 years with colorectal cancer. METHODS: We retrospectively analyzed patients aged ≥80 years who underwent curative resection for stage I-III colorectal cancer between April …

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Surgeon workload in supervised robotic colorectal surgery: a surgical task load index study

Yasuhiro Ishiyama, Yasumitsu Hirano, Sohei Akuta, Yume Minagawa et autres

BACKGROUND: Robot-assisted colorectal surgery (RAS) is increasingly adopted; however, surgeon workload during supervised training and its determinants remain unclear. METHODS: We conducted a single-center study combining a prospective surgical task load index (Surgical-TLX) assessment and a retrospective cohort analysis (October 2023-August 2025). …

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A prospective randomized comparative trial of da Vinci SP versus da Vinci Xi in colon and rectosigmoid cancer surgery: a single-center, open-label study protocol

Yasuhiro Ishiyama, Yasumitsu Hirano, Sohei Akuta, Yume Minagawa et autres

BACKGROUND: Colorectal cancer surgery increasingly emphasizes not only oncological outcomes but also postoperative recovery and patient-centered outcomes. Robotic-assisted surgery has gained widespread acceptance, and the da Vinci Single-Port (SP) system has emerged as a novel platform that may further reduce surgical invasiveness …

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Assessing the minimal invasiveness of pure single-incision da Vinci SP surgery for right-sided colon cancer: comparative analysis with the da Vinci Xi system using PSM and IPTW

Sohei Akuta, Yasumitsu Hirano, Yasuhiro Ishiyama, Yume Minagawa et autres

Few studies have compared the invasiveness and safety of pure single-incision robotic surgery using the da Vinci SP system (SP) without an assistant port with those using the da Vinci Xi system (Xi) for right-sided colon cancer. Surgical invasiveness was assessed using …

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Correction: Evaluation of PINK1 protein expression as a predictive marker for the efficacy of adjuvant chemotherapy in colorectal cancer: a retrospective study

Takatsugu Fujii, Masataka Hirasaki, Yasuo Kamakura, Tomonori Kawasaki et autres

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Short-Term Outcomes of Robotic-Assisted Sigmoidectomy Using the Senhance Digital Laparoscopy System: A Comparison With Laparoscopic Surgery Using Propensity Score Matching

Sohei Akuta, Yasumitsu Hirano, Yasuhiro Ishiyama, Yamato Misuzu et autres

Background Colorectal cancer is a common and deadly form of cancer. Sigmoid colon cancer is the most prevalent type of colon cancer. Robotic-assisted surgical systems, like the Senhance Digital Laparoscopy System, have attracted considerable attention in recent years. The purpose of this …

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International Telepresence‐Assisted Robotic Colorectal Surgery Using the da Vinci 5 System: A Technology Paper on Cross‐Border Remote Mentoring

Yume Minagawa, Yasumitsu Hirano, Yasuhiro Ishiyama, Sohei Akuta et autres

ABSTRACT Background Telepresence enables real‐time observation and remote mentoring across distances, potentially accelerating the dissemination of advanced minimally invasive techniques. The da Vinci 5 platform integrates Telepresence within the My Intuitive digital ecosystem, facilitating remote case observation, collaboration, and mentoring. Methods This …

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Surgical Outcomes of Low Anterior Resection Using the Senhance Surgical System: A Single‐Center Case Series

Takatsugu Fujii, Yasumitsu Hirano, Yasuhiro Ishiyama, Sohei Akuta et autres

INTRODUCTION: The Senhance Surgical System is the second robotic surgical platform approved for laparoscopic procedures in Japan. It is unique compared to other systems, offering eye-tracking camera control, haptic feedback, and reusable instruments. Although its application in colon surgery has shown favorable …

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[Mycobacteria other than tuberculosis combined primary lung cancer].

Yoshio Tsunezuka, Nobuhisa Ishikawa, Chikashi Hiranuma, Hidefumi Sato et autres

From January 1997 to June 1999, we performed surgery in 17 patients with mycobacteria other than tuberculosis (MOTT), and 2 patients with lung cancer among them. Both patients had the diagnosis of MOTT by sputa bacterial cultures preoperatively, but no diagnosis of …

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Pulmonary Blastoma in a Child: Report of a Case

Norihiko Ishikawa, Hideo Sato, Yoshio Tsunezuka, Chikashi Hiranuma et autres

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Surgical Outcome of Mycobacterium other than Mycobacterium Tuberculosis Pulmonary Disease

Yoshio Tsunezuka, Hideomi Sato, Chikashi Hiranuma

Between January 1995 and May 1999, MOTT were cultured from sputum, bronchoalveolar lavage or resected lung specimens in 110 cases. 17 patients with MOTT pulmonary disease underwent pulmonary resection. Preoperatively, 5 of 17 patients had been diagnosed with MOTT pulmonary disease. The …

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