Departments and specialties

Mayo Clinic has one of the largest and most experienced practices in the United States, with campuses in Arizona, Florida and Minnesota. Staff skilled in dozens of specialties work together to ensure quality care and successful recovery.

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Displaying 1-4 out of 4 doctors available

Last Name Initial: M

  1. George W. Marek, III, M.D., Ph.D.

    George W. Marek, III, M.D., Ph.D.

    1. Gastroenterologist
    1. Rochester, MN
    Areas of focus:

    Bravo capsule pH test, Colonoscopy, Flexible sigmoidoscopy, Esophageal dilation, Polypectomy, Esophagoscopy, Diagnostic... endoscopy, Gastroesophageal reflux disease, Diarrhea, Celiac disease, Irritable bowel syndrome, Fructose intolerance, Helicobacter pylori infection, Constipation, Colon polyps, Lactose intolerance, Esophageal stricture, Peptic ulcer, Alpha-1-antitrypsin deficiency, Malabsorption, Pelvic floor defecatory dysfunction, Ehlers-Danlos syndrome, Gastritis, Alpha-gal allergy, Bile acid malabsorption

  2. Daniel B. Maselli, M.D.

    Daniel B. Maselli, M.D.

    1. Gastroenterologist
    1. Rochester, MN
    Areas of focus:

    Upper endoscopy, Colonoscopy, Intragastric balloon procedure, Transoral outlet reduction, Endoscopic sleeve gastroplast...y, Endoscopic mucosal resection, Endoscopic biopsy, Endoscopic dilation, Endoscopic re-cellularization via electroporation therapy, Gastroesophageal reflux disease, Diarrhea, Obesity, Metabolic syndrome, Gastrointestinal bleeding, Constipation, Colon polyps, Esophageal stricture, Colonic dysmotility, Fatty liver disease, Esophageal varices, Gastrointestinal infection, Gastrointestinal fistula

  3. Kellie L. Mathis, M.D.

    Kellie L. Mathis, M.D.

    1. General Surgeon
    2. Colon and Rectal Surgeon
    1. Rochester, MN
    Areas of focus:

    Anorectal surgery, Coloanal anastomosis, Low anterior resection, Colonoscopy, Laparoscopic surgery, Ileoanal anastomosi...s surgery, Flexible sigmoidoscopy, Colostomy, Ileostomy surgery, Colorectal surgery, Minimally invasive surgery, Robotic surgery, Anoscopy, Rectovaginal fistula repair, Rectal cancer surgery, Colon cancer surgery, Colectomy, Intraoperative radiation therapy, Rectal prolapse surgery, Proctectomy, Small bowel resection, Minimally invasive intestinal surgery, Bowel resection, Digital rectal exam, Pelvic floor dysfunction, Colon cancer, Inflammatory bowel disease, Rectal cancer, Anorectal abnormality, Familial adenomatous polyposis, Ulcerative colitis, Diverticulitis, Crohn's disease, Constipation, Pouchitis, Ileostomy, Colon polyps, Anal fissure, Lynch syndrome, Fistula, Anal fistula, Vaginal fistula, Pelvic floor defecatory dysfunction, Anal cancer, Carcinoid tumor, Polyp, Tubular colon adenoma, Polyposis syndromes, Recurrent cancer, Anorectal disease, Hemorrhoids, Abscess

  4. Nicholas P. McKenna, M.D., M.S.

    Nicholas P. McKenna, M.D., M.S.

    1. Colon and Rectal Surgeon
    1. Rochester, MN
    Areas of focus:

    Anorectal surgery, Low anterior resection, Colonoscopy, Laparoscopic surgery, Ileoanal anastomosis surgery, Hemorrhoide...ctomy, Hemorrhoidal banding, Colostomy, Ileostomy surgery, Colorectal surgery, Minimally invasive surgery, Robotic surgery, Rectal cancer surgery, Colon cancer surgery, Colectomy, Proctectomy, Small bowel resection, Sacral nerve stimulation for fecal incontinence, Bowel resection, Colon cancer, Inflammatory bowel disease, Rectal cancer, Familial adenomatous polyposis, Ulcerative colitis, Diverticulitis, Crohn's disease, Ileostomy, Perianal abscess, Colon polyps, Anal fissure, Anal fistula, Anal cancer, Polyposis syndromes, Anorectal disease, Hemorrhoids, Anal squamous cell carcinoma

Research

Mayo Clinic radiologists and gastroenterologists were instrumental in developing novel techniques for finding and removing colon polyps, including stool DNA tests, probe-based confocal laser endomicroscopy and virtual colonoscopy.

Publications

See a list of publications about colon polyps by Mayo Clinic doctors on PubMed, a service of the National Library of Medicine.

Research Profiles

Sept. 24, 2025