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Stefan Riss

Department of General Surgery (Division of Visceral Surgery)
Position: Associate Professor


Colorectal Neoplasms; Crohn Disease; Pelvic Floor Disorders

Research interests

My current research focuses on colorectal disorders, including IBD and malignancies. Since a few years, my team strongly concentrates on pelvic floor problems. We aim to investigate functional outcomes following new treatment modalities for constipation and faecal incontinence. We also aim to evaluate new diagnostic tools for assessing pelvic floor disorders.

Selected publications

  1. Riss, S., Winstanley, J. & Collie, M., 2017. Laparoscopic ventral mesh rectopexy for obstructive defecation syndrome: still the way to go? International Urogynecology Journal. Available at:
  2. Kristo, I. et al., 2016. Minimal-invasive approach for penetrating Crohn�s disease is not associated with increased complications. Surgical Endoscopy, 30(12), pp.5239-5244. Available at:
  3. Riss, S. et al., 2011. The prevalence of hemorrhoids in adults. International Journal of Colorectal Disease, 27(2), pp.215-220. Available at:
  4. Riss, S. et al., 2015. Risk of definitive stoma after surgery for peritoneal malignancy in 958 patients: Comparative study between complete cytoreductive surgery and maximal tumor debulking. European Journal of Surgical Oncology (EJSO), 41(3), pp.392-395. Available at:
  5. Riss, S. et al., 2013. Repeat Intestinal Resections Increase the Risk of Recurrence of Crohnʼs Disease. Diseases of the Colon & Rectum, 56(7), pp.881-887. Available at: