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Colon and Rectal Surgery

The Department of Colon and Rectal Surgery specializes in surgical and multimodal treatments for lower digestive tract diseases such as colon cancer and inflammatory bowel disease.

Medical services

Five-member teams consisting of two to three supervising surgeons,one to two junior supervising surgeon, and one to two residents provides treatments in the inpatient ward. Experienced staff supervises the entire treatment, including surgery. Conferences are held three times weekly to discuss detailed treatment plans and other pertinent issues for individual cases. The outpatient clinic is open from Monday to Friday for general and specialized medical services.

Diagnosis and treatment policy

The surgeons in this department take the time to provide explanations before examinations and treatment. Particularly when the treatment plan includes surgery, the surgeon explains the advantages and disadvantages of multiple treatment options and is obligated to respect the patient’s decision.


More than 1,000 colon oscopic examinations are performed annually. Endoscopic mucosal resection is performed for early-stage cancer localized in the mucosa. The number of colon cancer resections performed annually exceeds 250. The department specializes particularly in rectal cancer surgery with the preservation of urination, defecation and sexual functions; and endoscopicallyassisted, minimally invasive colorectal resection.

Target diseases

Colorectal cancer, ulcerative colitis, Crohn’s disease, small intestinal tumors

Advanced treatments/ Specialized treatments

  • Preoperative chemoradiotherapy for rectal cancer for the preservation of rectal function
  • Minimally invasive laparoscopically-assisted colorectal resection
  • Robot-assisted rectal resection

Frequently performed tests

  • Lower gastrointestinal endoscopy: terminal ileum, colon and rectum
  • Gastrointestinal contrast examination: x-ray examination of the small intestine and large intestine using contrast agent
  • Anorectal function test: measurement of anal sphincter pressure and rectal volume
  • Resection and diagnosis of intramucosal colon and rectal cancer
Soichiro Ishihara

Soichiro Ishihara


Colorectal Surgery; Vascular Surgery


M.D., Ph.D


General Surgery, Gastrointestinal Surgery, Colorectal Surgery, Laparoscopic Surgery, Robotic Surgery, Minimally  Invasive Surgery, Chemotherapy, Gastrointestinal Endoscopy, Colorectal Disease, Anorectal Disease, Colorectal Cancer, Inflammatory Bowel Disease, Diverticular Disease, Colorectal Polyp, Vascular Surgery, Abdominal Aortic Aneurysm, Thoracic Aortic Aneurysm, Endovascular Aneurysm Repair, Thoracic Endovascular Aortic Repair, Distal Bypass, Critical Limb Ischemia, Takayasu's Disease, Buerger Disease, Pancreatoduodeal Artery Aneurysm, Popliteal Entrapment Syndrome, Behçet's Disease, Carotid Endarterectomy, Hemodialysis, Peripheral Artery Aneurysm, Segmental Arterial Mediolysis, Deep Vein Thrombosis

Research Interests

Surgical Oncology, Vascular Surgery



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Major diseases and numbers of inpatients treated

Disease name Total number of patients
1 Colon cancer 704
2 Inflammatory bowel disease 81
3 Gastric cancer 105
4 Diseases of the small intestine and ileus 58
5 Hernia 23
6 Appendicitis 19
7 Gastrointestinal perforation peritonitis 23


Areas of expertise, treatment and examination methods

  1. Colon cancer
  2. Inflammatory bowel disease
Treatment methods
  1. Colectomy (including robot-assisted and laparoscopic surgeries)
  2. Chemotherapy
Examination methods
  1. Endoscopy
  2. Gastrointestinal contrast radiography
  3. Endoscopic ultrasound

Numbers of major operations and treatments performed

Name of operation/treatment Number
1 Colectomy (cancer)
>> Laparoscopic
>> Robot-assisted
2 Surgery for inflammatory bowel disease 27
3 Port placement for intraperitoneal chemotherapy 16


Major diseases and numbers of in- and outpatients treated in this department

Disease name Number
1 Lower gastrointestinal endoscopy approx. 1,200
2 Upper gastrointestinal endoscopy approx. 500
3 Barium enema examination approx. 600
4 Small bowel series approx. 10


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