Maria Ximena Traa Kiely MD, MPH, FACS, FASCRS

Maria Ximena Traa Kiely MD, MPH, FACS, FASCRS

TEL: 503-281-0561
FAX: 503-416-7377

“I believe the ideal surgeon is one who can communicate well, understand the concerns of patients and their families, and exercise good judgment in and out of the operating room, all while performing technically excellent surgery. I strive for this ideal every day.”

Dr. Kiely is fascinated by the variety of procedures and disease processes within colorectal surgery. She joined the colorectal field because she felt that there was a need for women surgeons in the specialty, especially given that women often leave anorectal and pelvic floor issues untreated due to concerns about embarrassing exams and discussions. Her favorite part about her job is that fixing even the most basic anorectal problem, like hemorrhoids, can make a big impact on a person’s life – especially when also making the patient feel comfortable, at ease, and minimizing embarrassment.

Dr. Kiely received her Master of Public Health degree with a concentration in Quantitative Methods from Harvard, and she is passionate about practicing evidence-based medicine. Dr. Kiely is fluent in Dutch and Spanish and enjoys working with the Hispanic population.


Fellowship, Colon & Rectal Surgery, Oregon Health & Science University, Portland, OR, 2018

Residency, Tufts Medical Center, Boston, MA, 2017

MPH, Harvard University, Boston, MA, 2015

MD, Oxford University Medical School, Oxford, UK, 2010

BA, Cellular & Genetic Pathology, Cambridge University, Cambridge, UK, 2005


Colon & Rectal Surgery


Portland Monthly Magazine, “Top Doctors”, 2022, 2023, 2024


Kiely MX1, Leung KM1 , Kimbrell A, Asban A, Kelley R, Bleday R, Davids JS, Melnitchouk N. Outcomes of Abdominal Surgery in Patients with Mechanical Ventricular Assist Devices: A Multi-Institutional Study. Annals of Surgery September 2017.

Younkin M, Kiely MX, Chen L, Yoo J. Prevalence of colorectal cancer in young patients with isolated bright red blood per rectum (BRBPR). Am J Digest Dis 2017;4(1):6-12.

Traa MX, Barboza, L, Doron, S, Snydman, DR, Noubary, F, Nasraway, SA. Horizontal Infection Control Strategy Decreases Methicillin-resistant Staphylococcus aureus Infection and Eliminates Bacteremia in a Surgical ICU Without Active Surveillance Published in Critical Care Medicine 42(10):2151-7; October 2014. PMID: 24979485.

Traa MX, Orkin BA, Flores A, Popowich DA. Toxic Colitis in a Ten Year old Girl with Crohn’s Disease. J Ped Surg Case Reports 2013;1(9)284-87

Traa MX, Derry S, Moore RA. Single dose oral fenoprofen for acute postoperative pain in adults. Cochrane Database Syst Rev. 2011 Feb 16, (2): CD007556 PMID: 21328296

Levene I, Traa MX, Ling R, Lally M, Adams E. Student-patient contact: are medical students too cautious? Med Teach. 2011;33(4)338-9 PMID: 21456994