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Walter Alex Koltun, M.D.

Office Information

Penn State Hershey Surgical Specialties
200 Campus Drive, Entrance 4, 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 (IBD) Laparoscopic Colon and Rectal Surgery Ulcerative Colitis

Practice Locations

Professional Education

Fellowship, Surgery, Colon/Rectal, Lahey Hospital & Medical Center (1990) Residency, Surgery, General, Brigham and Women's Hospital (Massachusetts) (1989) Residency, Surgery, General, 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


Connelly TM, Berg AS, Hegarty JP, Deiling S, Brinton D, Poritz LS, Koltun WA.
The TNFSF15 Gene Single Nucleotide Polymorphism rs7848647 Is Associated With Surgical Diverticulitis.
Ann Surg. 2014 Jun;259(6):1132-7.
Pogacnik JS, Messaris E, Deiling SM, Connelly TM, Berg AS, Stewart DB, McKenna KJ, Poritz LS, Koltun WA.
Increased risk of incisional hernia after sigmoid colectomy for diverticulitis compared with colon cancer.
J Am Coll Surg. 2014 May;218(5):920-8. Epub 2014 Feb 19.
Connelly TM, Berg AS, Harris LR 3rd, Hegarty JP, Ruggiero FM, Deiling SM, Brinton DL, Koltun WA.
T-cell activation Rho GTPase-activating protein expression varies with inflammation location and severity in Crohn's disease.
J Surg Res. 2014 Jan 17.
Connelly TM, Koltun WA.
The cancer "fear" in IBD patients: is it still REAL?
J Gastrointest Surg. 2014 Jan;18(1):213-8. Epub 2013 Sep 4.
Connelly TM, Koltun WA, Berg AS, Hegarty JP, Brinton D, Deiling S, Poritz LS, Stewart DB.
A single nucleotide polymorphism in the STAT5 gene favors colonic as opposed to small-bowel inflammation in Crohn's disease.
Dis Colon Rectum. 2013 Sep;56(9):1068-74.

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