Marienhaus Hospital St. Elisabeth Neuwied

Neuwied, Germany

Department of Internal Medicine (Gastroenterology)

Christian-René de Mas

Dr. med.

Christian-René de Mas

Specialized in: gastroenterology

Curriculum vitae keyboard_arrow_down

Professional experience

  • 1975 – 1982 education at the Universities of Dortmund, Dusseldorf and Heidelberg
  • 1982 approval of medical practice and thesis defense at the Heidelberg University
  • 1990 recognition as general practitioner
  • 1991 recognition as gastroenterologist
  • 1998 recognition as diabetologist of the German Diabetes Society (DDG) 
  • 2006 Member of the European Board of Gastroenterology
  • 2014 recognition as specialist in the field of palliative medicine
  • 2014 specialty geriatrics
  • Since January 1st 2003 chief physician of the Marienhaus Klinikum 


  • Gastroenterology
  • Diabetolgy
  • Hepatology
  • Therapeutic Intensive Care Medicine
  • Palliative Medicine
  • Aviation medicine


  • German Society for Digestive and Metabolic Diseases
  • German Society for Endoscopy and Imaging
  • Professional Association for Gastroenterology of Rhineland-Palatinate
  • German Society of Aerospace Medicine
  • South West German Professional Society of Emergency Medicine Physicians
  • Medical working group of the German Parachute Federation
  • German Cancer Society 

The Department of Internal Medicine (Gastroenterology) under the direction of Dr. med. Christian-René de Mas has a total of 128 beds. The Department of Gastroenterology at the Marienhaus Klinikum St. Elisabeth Neuwied deals with the diagnosis, treatment and prevention of diseases of the gastrointestinal tract, as well as those related to its organs: liver, gall bladder and pancreas. A special focus is on the endoscopic diagnosis and treatment of tumors of the gastrointestinal tract, biliary tract and pancreas at the early stages. 

Apart from gastroscopy and colonoscopy, the Department of Internal Medicine (Gastroenterology) uses almost all modern endoscopic methods. Moreover, the Marienhaus Klinikum St. Elisabeth Neuwied has its private X-ray unit for imaging of the biliary tract (ERCP).  If necessary, there can be provided imaging diagnosis (cholangioscopy). The Department under the direction of Dr. med. Christian-René de Mas also offers small bowel endoscopy (double balloon endoscopy). The range of diagnostic services is completed by endosonography. The tissue samples can be obtained not during endoscopy, but also within laparoscopy. The specialized spectrum of the Department is completed by the diagnosis and treatment of liver diseases (hepatology). 

Hepatology makes up another focus of gastroenterology at the Marienhaus Klinikum St. Elisabeth Neuwied. There are treated patients with viral (e.g. viral hepatitis B and C) and autoimmune diseases of the liver (autoimmune hepatitis, primary biliary cirrhosis (PBC) and primary sclerosing cholangitis (PSC)). The Department of Internal Medicine (Gastroenterology) is part of the professional Hepatitis Association and the clinic, which is included into the Liver Foundation. Furthermore, as an academic teaching hospital, the Department under the direction of Dr. med. Christian-René de Mas maintains tight cooperation with the University Medical Center of the Johannes Gutenberg University Mainz.  

The gastroenterological endoscopic tests are focused on children. These are carried out by the experts of the Department of Pediatrics at the Marienhaus Klinikum St. Elisabeth Neuwied.  

The diagnostic and therapeutic options of the Marienhaus Klinikum St. Elisabeth Neuwied cover the entire spectrum of gastroenterology:

  • Enteroscopy (small bowel endoscopy)
  • Colonoscopy (large intestine endoscopy)
  • Recto- and sigmoidoscopy (endoscopy of the rectum)
  • ERCP (endoscopy of the biliary tract and pancreas)
  • Minilaparoscopy
  • Endosonography (“internal ultrasound”)
  • Ultrasound of the abdominal cavity
  • Contrast-enhanced ultrasound 
  • Organ puncture
  • Hydrogen breath test

At the same time, the Marienhaus Klinikum St. Elisabeth Neuwied uses all advanced methods of hemostasis. Upon stenosis of the esophagus, stomach, large intestine, biliary tract and pancreas, there can be used not only extension (bougienage, dilation), but also implants (tubes made of metal or plastic). Still it depends on the cause of stenosis. Endoscopic tests can involve tissue sampling for histological examination. Polyps and smaller tumors are removed endoscopically and thus the patient avoids the major abdominal surgery with the use of an electrical loop.

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