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M.D. Professor of Medicine Ayhan Koyuncu

Professor of Medicine Ayhan Koyuncu
+90 850 460 63 34

Hospital Medicana Sivas Hospital, Sivas

Department General Surgery

Academic Title Professor of Medicine                                 

Physician Name Ayhan Koyuncu, M.D. Professor of Medicine

Graduate Education Uludağ University School of Medicine (1991)

Postgraduate Education (Residency) Ankara University School of Medicine, Department of General Surgery Medicine Residency Program (1997)


Area of Expertise General Surgery


Breast Cancer Surgery


Breast Protective Surgery


Breast Cysts and Masses


Gynecomastia Operations


Hemorrhoid Surgery


Anal Fissure and Fistula Surgery with Laser Method


Laser Method with Battery Reversal


Gallbladder Surgery by Laser Method (Closed, Open)


Biliary tract obstruction operations


Reflux Procedures


Hernia Surgery (Closed, Open)


Appendectomy Thyroid Surgery (With Nerve Monitor)


Parathyroid Surgery


Liver Surgery


Gastrointestinal Surgery


Large Bowel Cancer Surgery


Small Bowel Surgery


Experience Ardahan Central Health Center (1991-1993)


Ankara University Faculty of Medicine (1993-1997)


Orhaneli State Hospital (1998-1999)


Cumhuriyet University School of Medicine (1999-2013)


Sivas Anatolian Hospital (2013-2014)


Medicana Sivas Hospital, Sivas, Department of General Surgery, M.D. Professor of Medicine (2014-present)


Publications: International


1.Ozmen V, Boylu S, Ok E, Canturk NZ, Celik V, Kapkac M, Girgin S, Tireli M, Ihtiyar E, Demircan O, Baskan MS, Koyuncu A, Tasdelen I, Dumanli E, Ozdener F, Zaborek P. Factors affecting breast cancer treatment delay in Turkey: a study from Turkish Federation of Breast Diseases Societies. Eur J Public Health. 2014 Aug 5. pii: cku086. [Epub ahead of print]

2.Dogan N, Gokakin AK, Koyuncu A, Bagcivan I, Aydin C, Topcu O, Yildirim S. In vitro motility changes in Roux limb after Roux-en-Y reconstruction. Bratisl Lek Listy. 2014;115(6):340-4.

3.Gokakin AK, Kurt A, Akgol G, Karakus BC, Atabey M, Koyuncu A, Topcu O, Goren E. Effects of Ramadan fasting on peptic ulcer disease as diagnosed by upper gastrointestinal endoscopy.Arab J Gastroenterol. 2012 Dec;13(4):180-3.

4:Gökakın AK, Kurt A, Atabey M, Koyuncu A, Topçu O, Aydın C, Sen M, Akgöl G. The impact of Ramadan on peptic ulcer perforation. Ulus Travma Acil Cerrahi Derg. 2012 Jul;18(4):339-43. doi: 10.5505/tjtes.2012.61257.

5:Yildirim Y, Elagoz S, Koyuncu A, Aydin C, Karadayi K. Management of neuroendocrine carcinomas of the breast: A rare entity. Oncol Lett. 2011 Sep 1;2(5):887-890.

6:Sezer H, Yilmaz M, Gurler H, Koyuncu A. Beast cancer risk factors in Turkey: a hospital- based case-control study. Asian Pac J Cancer Prev. 2011;12(9):2317-22.

7:Kurt A, Altun A, Bağcivan I, Koyuncu A, Topcu O, Aydın C, Kaya T. Effects of proton pump inhibitors and h(2) receptor antagonists on the ileum motility. Gastroenterol Res Pract. 2011;2011:218342.

8:Hasbek Z, Turgut B, Erselcan T, Koyuncu A, Fatih Börksüz M, Turgut NH, Yumuk F. he Evaluation of Microcarcinoma in Differentiated Thyroid Cancers According to Old and New TNM Classification.Mol Imaging Radionucl Ther. 2011 Dec;20(3):94-9

9:Cakmak E, Koyuncu A, Yilmaz A, Yönem O, Ataseven H, Sarkiş C. atrogenic pneumoscrotum after colonoscopy. Turk J Gastroenterol. 2011 Aug;22(4):443-4.

10:Koyuncu A, Aydın C, Topçu Ö, Gükçe ON, Elagöz Ş Could total thyroidectomy become the Standard treatment for Graves’ Disease? Surgery Today Surg Today. 2010;40(1):22-5.

11: Gur AS, Unal B, Ozbek U, Ozmen V, Aydogan F, Gokgoz S, Gulluoglu BM, Aksaz E, Ozbas S, Baskan S, Koyuncu A, Soran A; For the Turkish Federation of Breast Disease Associations Protocol MF08-01 investigators. Validation of breast cancer nomograms for predicting the non-sentinel lymph node metastases after a positive sentinel lymph node biopsy in a multi-center study. Eur J Surg Oncol. 2010 Jan;36(1):30-5.

12: Topcu O, Kurt A, Nadir I, Arici S, Koyuncu A, Aydin C. Effects of contrast media on the hepato-pancreato-biliary system.World J Gastroenterol. 2009 Oct 14;15(38):4788-93.

13: Seçkin Y, Koyuncu A, Yönem O, Arici DS, Yilmaz A, Aydin C. Duodenal stromal tumor: a rare and overlooked cause of massive gastrointestinal bleeding. Turk J Gastroenterol. 2009 Jun;20(2):150-1.

14: Soylu S, Aydin C, Bagcivan I, Yildirim S, Koyuncu A, Topcu O, Arici S. Effects of NO/L-arginine pathway on gallbladder contractility in bile duct ligated guinea pigs. J Surg Res. 2009 Jul;155(1):70-6.

15: Aydin C, Bagcivan I, Gursoy S, Altun A, Topcu O, Koyuncu A. Altered spontaneous contractions of the ileum by anesthetic agents in rats exposed to peritonitis. World J Gastroenterol. 2009 Apr 7;15(13):1620-4.

16: Topcu O, Sumer Z, Tuncer E, Aydin C, Koyuncu A. Efficacy of chlorhexidine gluconate during surgery for hydatid cyst. World J Surg. 2009 Jun;33(6):1274-80.

17: Aydin C, Bagcivan I, Yildirim S, Koyuncu A, Topcu O, Soylu S, Ozer H. Effect of nitric oxide/cyclic guanosine mono-phosphate pathway on gallbladder relaxant response in bile duct-ligated guinea pigs. Eur Surg Res. 2009;42(3):189-94.

18: Arici DS, Tuncer E, Ozer H, Simek G, Koyuncu A. Expression of retinoblastoma and cyclin D1 in gastric carcinoma. Neoplasma. 2009;56(1):63-7.

19: Koyuncu A, Bagcivan I, Sarac B, Aydin C, Yildirim S, Sarioglu Y. Lack of nitrate tolerance in isosorbid dinitrate- and sodium nitroprusside-induced relaxation of rabbit internal anal sphincter. World J Gastroenterol. 2008 Aug 7;14(29):4667-71.

20: Dokmetas HS, Koyuncu A, Korkmaz S, Dokmetas I. Two cases of acute suppurative thyroiditis secondary to piriform sinus fistula. Saudi Med J. 2008 Jan;29(1):142-3.

21: Dökmetas HS, Korkmaz S, Ozcelik S, Koyuncu A. Madelung's disease in a patient with diabetes mellitus. Skinmed. 2007 Sep-Oct;6(5):247-9.

22: Türkay C, Yönem O, Arici S, Koyuncu A, Kanbay M. Effect of angiotensin-converting enzyme inhibition on experimental hepatic fibrogenesis. Dig Dis Sci. 2008 Mar;53(3):789-93.

23: Soydan AS, Dokmetas HS, Cetin M, Koyuncu A, Kaptanoglu E, Elden H. The evaluation of the role of beta-hydroxy fatty acids on chronic inflammation and insulin resistance. Mediators Inflamm. 2006;2006(5):64980.

24: Turgut B, Elagoz S, Erselcan T, Koyuncu A, Dokmetas HS, Hasbek Z, Ozdemir S, Aydin C. Preoperative localization of parathyroid adenomas with technetium-99m methoxyisobutylisonitrile imaging: relationship with P-glycoprotein expression, oxyphilic cell content, and tumoral tissue volume. Cancer Biother Radiopharm. 2006 Dec;21(6):579-90.

25: Elagoz S, Egilmez R, Koyuncu A, Muslehiddinoglu A, Arici S. The intratumoral microvessel density and expression of bFGF and nm23-H1 in colorectal cancer. Pathol Oncol Res. 2006;12(1):21-7.

26: Yildirim S, Aydin C, Koyuncu A, Bagcivan I, Sarac B, Sarioglu Y. Enhancement of EFS-induced contractions, by agmatine, in guinea pig gallbladder smooth muscle strips. J Gastroenterol. 2005 May;40(5):498-503.

27: Koyuncu A, Dokmetaş HS, Aydin C, Turan M, Erselcan T, Sozeri S, Sen M. Surgical management strategies in patients with primary hyperparathyroidism: which technique in which patients? Med Princ Pract. 2005 May-Jun;14(3):194-8.

28: Köylüoğlu G, Yildiz E, Koyuncu A, Atalar M. Management of an esophagogastric fibromatosis in a child: a case report. J Pediatr Surg. 2004 Apr;39(4):640-2.

29: Turan M, Sen M, Karadayi K, Koyuncu A, Topcu O, Yildirir C, Duman M. Our sigmoid colon volvulus experience and benefits of colonoscope in detortion process. Rev Esp Enferm Dig. 2004 Jan;96(1):32-5.

30: Koyuncu A, Dökmetas HS, Turan M, Aydin C, Karadayi K, Budak E, Gökgöz S, Sen M. Comparison of different thyroidectomy techniques for benign thyroid disease. Endocr J. 2003 Dec;50(6):723-7.

31: Aydin C, Sarac B, Koyuncu A, Yildirim S, Sen M, Sarioglu Y. Relaxant effect of omeprazole and lansoprazole in guinea pig gallbladder muscle strips in vitro. J Gastroenterol. 2003;38(8):765-71.

32: Türkçapar N, Bayar S, Koyuncu A, Ceyhan K. Octreotide inhibits hepatic fibrosis, bile duct proliferation and bacterial translocation in obstructive jaundice. Hepatogastroenterology. 2003 May-Jun;50(51):680-3.

33: Koyuncu A, Yildirim S, Aydin C, Bagcivan I, Saraç B. Relaxation effects of adrenomedullin in carbachol-precontracted rabbit internal anal sphincter. J Gastroenterol. 2003;38(5):460-4.

34: Koyuncu A, Aydin C, Turan M, Taş F, Gökgöz S, Sen M. Traumatic pelvic hydatid cyst rupture: report of a case. Ulus Travma Acil Cerrahi Derg. 2003 Jul;9(3):212-4. PubMed PMID: 12923699.

35: Turan M, Sen M, Koyuncu A, Aydin C, Arici S. Sigmoid colon perforation as an unusual complication of Behçet's syndrome: report of a case. Surg Today. 2003;33(5):383-6.

36: Inan M, Koyuncu A, Aydin C, Turan M, Gokgoz S, Sen M. Thyroid hormone supplementation in sepsis: an experimental study. Surg Today. 2003;33(1):24-9.

37: Turan M, Ok E, Sen M, Koyuncu A, Aydin C, Erdem M, Güven Y. A simplified operative technique for single-staged resection of left-sided colon obstructions: report of a 9-year experience. Surg Today. 2002;32(11):959-64.

38: Turan M, Sen M, Koyuncu A, Aydin C, Elaldi N, Arici S. Pancreatic pseudotumor due to peripancreatic tuberculous lymphadenitis. Pancreatology. 2002;2(6):561-4.

39: Koyuncu A, Aydintuğ S, Koçak S, Aydin C, Demirer S, Topçu O, Kuterdem E. Effect of thyroid hormones on stress ulcer formation. ANZ J Surg. 2002 Sep;72(9):672-5.

40: Yerdel MA, Karayalcin K, Koyuncu A, Akin B, Koksoy C, Turkcapar AG, Erverdi N, Alaçayir I, Bumin C, Aras N. Direct trocar insertion versus Veress needle insertion in laparoscopic cholecystectomy. Am J Surg. 1999 Mar;177(3):247-9.