Rectum Expert Witnesses

Rectum expert witnesses and consultants listed here may be able to form expert opinions, draft expert witness reports, provide expert witness testimony at deposition and/or trial as or serve as consulting (non-testifying) experts on rectum. The rectum expert witness listings on this page are typically from fields/areas of expertise such as: Colon & Rectal Surgery, General Surgery, and Pathology.

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Mark G Ettel, MD

Gastrointestinal and Liver Pathologist

University of Rochester Medical Center

Rochester, New York
Pathology - Gastrointestinal, GI, Liver, Pancreas, Biliary, Frozen section, colon, stomach, intestine, bowel, biopsy, IBD, inflammatory bowel disease, rectum, anus, dysplasia, hepatitis, pancreas, colitis
Associate Director of Surgical Pathology (2025-present) and Director of Gastrointestinal Pathology (2021-present) at the University of Rochester Medical Center. Fellowship trained and clinically active in Gastrointestinal, Liver, and Pancreas pathology, and also clinically practice frozen section diagnosis and cardiac pathology. I have published peer-reviewed articles on a variety of topics in gastrointestinal and liver pathology including pancreatic adenocarcinoma, liver biopsy diagnosis, esophagitis, and colitis. I also have presented and moderated educational and research sessions on GI, liver, and general surgical pathology at national conferences including the United States and Canadian Academy of Pathology (USCAP) Annual Meeting and American Society for Clinical Pathology (ASCP).
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Ritha Belizaire, MD FACS FASCRS

General, colorectal and minimally invasive surgeon

Houston Community Surgical

Houston, Texas
Colon & Rectal Surgery, General Surgery - colonoscopy, GI surgery, proctology, pelvic surgery, robotic surgery, colon cancer, rectal cancer, Diverticulitis, Appendectomy, minimally invasive surgery, intestine, colon, rectum, Gallbladder, Cholecystectomy , Appendix, Colostomy, Ileostomy
Dual board certified general and colorectal surgeon in the Houston area. I am an assistant professor of surgery and owner of my solo general and colorectal surgery practice. Extensive experience in academic surgery (OH, NY and TX), resident and medical student education and serving low income/under resourced communities. I take care of patients with disorders of the gallbladder, small bowel, appendix, benign skin and soft tissue, colon, rectum and anus. I am certified in robotic surgery and perform colonoscopy as part of my practice.