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Walter Alex Koltun, M.D.

Office Location

Penn State Hershey Surgical Specialties
500 University Drive, UPC II, Suite 3100
Hershey, PA 17033
Tel: 800-243-1455 / 717-531-8887 Fax: 717-531-0646


Colon & Rectal Surgery

Patient Services Provided

Colon & Rectal Cancer Crohn's Disease Inflammatory Bowel Disease Laparoscopic Colon and Rectal Surgery Ulcerative Colitis

Professional Education

Fellowship, Lahey Hospital & Medical Center (1990) Fellowship, Surgery, General, Harvard Medical School (1986) Residency, Brigham & Women's Hospital (1984) M.D., Harvard Medical School (1981)

Research Interests

Inflammatory Bowel Disease
Diverticular Disease

Academic Interests

Inflammatory Bowel Disease
Colon and Rectal Cancer
Diverticular Disease


Sehgal R, Berg A, Polinski JI, Hegarty JP, Lin Z, McKenna KJ, Stewart DB,Poritz LS, Koltun WA.
Mutations in IRGM are associated with more frequent need for surgery in patients with ileocolonic Crohn's disease. Dis Colon Rectum.
2012 Feb;55(2):115-21.
Poritz LS, Sehgal R, Hartnett K, Berg A, Koltun WA.
Tumor volume and percent positive lymph nodes as a predictor of 5-year survival in colorectal cancer.
Surgery. 2011 Oct;150(4):649-55.
Haveran LA, Sehgal R, Poritz LS, McKenna KJ, Stewart DB, Koltun WA.
Infliximab and/or azathioprine in the treatment of Crohn's disease-like complications after IPAA.
Dis Colon Rectum. 2011 Jan;54(1):15-20.
Sehgal R, Berg A, Figueroa R, Poritz LS, McKenna KJ, Stewart DB, Koltun WA.
Risk factors for surgical site infections after colorectal resection in diabetic patients.
J Am Coll Surg. 2011 Jan;212(1):29-34.
Sehgal R, Berg A, Hegarty JP, Kelly AA, Lin Z, Poritz LS, Koltun WA.
NOD2/CARD15 mutations correlate with severe pouchitis after ileal pouch-anal anastomosis.
Dis Colon Rectum. 2010 Nov;53(11):1487-94.

Honors and Awards

Thomas V. N. Ballantine Memorial Award for Excellence in Surgical Education, Penn State Milton S. Hershey Medical Center, 2004, 1996 Outstanding Mentor, Penn State College of Medicine Class of 2008 Castle-Connelly Top Doctor, 2011 Best Doctor for Colon and Rectal Surgery, 2003-2004, 2006-2011