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PD. Dr. med. Klaus-Peter Riesener, MHBA image

Department of general, abdominal surgery and coloproctology

PD. Dr. med. Klaus-Peter Riesener, MHBA
general surgery, visceral surgery, physical therapy, proctology

About the department

The department of general, abdominal surgery and coloproctology at Marien Hospital Marl provides the full range of services in general surgery, endocrine, abdominal and colon surgery. All operations are performed minimally invasively without a large incision in the abdominal cavity, reducing recovery time. Procedures can be done on an outpatient and inpatient basis. The department has established an interdisciplinary intestinal centre for colon and rectal cancer treatment and has received a quality certificate from the Cancer Center of the German Cancer Society, which confirms high-level medicine. Experienced doctors have developed a structured treatment concept to improve the care of patients with malignant tumours significantly. Interventions are performed using robotic surgery, such as the da Vinci method. The department provides 24-hour emergency assistance.

The main directions of the department are visceral surgery, proctology, and endocrine surgery. Visceral surgery covers the entire spectrum of benign and malignant and acute and chronic inflammatory diseases. In addition, specialists in the department diagnose and treat pathological conditions of tissues that produce hormones. Operations are performed on the thyroid gland, parathyroid gland and adrenal glands.

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Treatment and diagnostic focus of the department


  • Decubitus ulcers
  • Venous diseases and secondary diseases
  • Arterial vascular diseases
  • Colon cancer 
  • Hernias (inguinal hernias, umbilical hernias and scars)
  • Soft tissue and skin tumours 
  • Anal diseases (haemorrhoids, fistulas or abscesses)
  • Diseases of hormone-producing tissue (thyroid, parathyroid, adrenal glands)
  • Other pathological conditions

Diagnostic service: 

  • Anamnesis
  • Physical examination 
  • Laboratory testing (blood, urine)
  • Hormone panel 
  • Gastroscopy (a flexible tube is used to look inside the stomach)
  • Colonoscopy, rectoscory (fibre optic camera on a flexible tube passed through the anus to look inside the colon)
  • Conventional X-rays
  • Native sonography (test using sound waves, gel and a small probe to produce an image of the arteries)
  • Duplex sonography
  • One-dimensional Doppler sonography
  • Endosonography

Treatment options:

  • Amputation Surgery
  • Endocrine Surgery
  • Liver, bile, pancreas surgery
  • Gastrointestinal Surgery
  • Minimally invasive endoscopic surgeries
  • Minimally invasive laparoscopic surgeries
  • Port implantation
  • Pacemaker interventions
  • Oesophagal surgery
  • Special consultation
  • Tumour surgery
  • Computer-assisted operations
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Doctor profile


  • 1977 - 1983 Studied human medicine in Mainz and Aachen
  • 1984 Promotion to Dr. medical RWTH Aachen
  • 1999 Habilitation in the field of surgery
  • 2000 Recognition of focus on visceral surgery
  • 2007 Additional qualification in physical therapy
  • 2009 Additional qualification in proctology
  • 2014 - 2016 Part-time studies at the Friedrich-Alexander-University Erlangen-Nuremberg
  • 2016 Master of Health Business Administration


  • 1983 - 1998 Assistant Surgical Univ. Clinic of the RWTH Aachen University
  • 1992 Specialist in Surgery
  • 1998 Appointment as Senior Physician Surgical Univ. Clinic of the RWTH Aachen University
  • 2001 Head of the department for general and visceral surgery at Marien-Hospital Marl
  • 2005 Medical Director of the Marien Hospital Marl
  • 2012 - 2015 Head of the Clinic for Surgery, Chief Physician in the Department of General and Visceral Surgery at St. Sixtus Hospital in Haltern am See

Awards, memberships, publications

  • German Society for Surgery
  • German Society for General and Visceral Surgery
  • Professional Association of German Surgeons
  • Association of Lower Rhine-Westphalian Surgeons
  • German Society for Coloproctology
  • German Hernia Society
  • German Society for Ultrasound in Medicine
  • Convention of Senior Hospital Surgeons
  • International Society of Surgeons
  • International Hepato-Pancreato-Biliary Association
  • European Hernia Society
  • American Institute of Ultrasound in Medicine
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