Assoc. Prof. MD. Onur Bayraktar

Assoc. Prof. MD.

Onur Bayraktar

Liv Hospital Vadistanbul

General Surgery

Assoc. Prof. MD.

Onur Bayraktar

Liv Hospital Vadistanbul

General Surgery

Areas of Interests

Digestive system diseases (reflux, hiatal hernia) and cancers (stomach, colorectal cancers)
Colorectal surgery (cancers, inflammatory bowel diseases)
Robotic/laparoscopic surgery
Proctology (hemorrhoids, anal fissure, fistula, abscess, ingrown hair)
Abdominal wall and inguinal hernias
Cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (HIPEC)

Education:

Istanbul University Cerrahpaşa Faculty of Medicine, Residency Training (2005-2010)
Istanbul University Cerrahpaşa Faculty of Medicine, Medical Education (1999-2005)

Experience:

Memorial Şişli Hospital (2021-2025)
Istanbul Florence Nightingale Hospital, Science University (2018-2012)
Acıbadem University Atakent Hospital (2014-2018)
29 Mayis Hospital (2012-2013)
Siirt Kurtalan State Hospital (2011-2012)

Articles Published in International Peer-Reviewed Journals:

Karagöz Avcı Saliha, Yüceyar Serdar, Aytaç Erman, Bayraktar Onur, Erenler İlknur, Üstün Hüseyin, Uzun Hafize, Ertürk Süphan. Comparison of classical surgery and sutureless repair with DuraSeal or fibrin glue for duodenal perforation in rats. Ulus Travma Acil Cerrahi Derg. 2011 Jan;17(1):9-13. Doi: 10.5505/tjtes.2011.13914 (ISSN: 1306-696X) (SCI-E) (Original Article)
Bayraktar Barış, Yılmaz Erkan, Bayraktar Onur, Apaydın Bedii Berat, Erenler Ergüner İlknur, Kayabaşı Bayram, Özçelik Alp, Eren Bülent. Distribution of HLA antigens in breast cancer. Bratisl Lek Listy. 2012;113(6):372-375. Doi: 10.4149/BLL_2012_084 (ISSN:0006-9248) (SCI-E) (Original Article)
Bayraktar Onur, Bayraktar Barış, Atasoy Deniz, Erenler İlknur, Özemir İbrahim Ali, Bölük Salih, Ünal Bayraktar Özge, Bayraktar Aise, Tortum Osman Baran, Yiğitbaşı Rafet. Covered self-expandable metallic stents could be used successfully in the palliation of malignant cervical esophageal strictures: preliminary report. Surg Laparosc Endosc Percutan Tech. 2013 Apr;23(2):e41-4. doi: 10.1097/SLE.0b013e318275b35f. (ISSN: 1530-4515) (SCI) (Original Article)
Bayraktar Barış, Demiral Gökhan, Özemir İbrahim Ali, Bayraktar Onur, Yılmabaşar Mehmet Gökçe, Bölük Salih. Bilateral Giant Mediastinal Parathyroid Adenomas. Presented With Severe Hypercalcemia: Report of a Case. J Med Cases. 2014;5(3):167-170 Doi: 10.14740/jmc1686e. (ISSN: 1923-4155) (non-SCI-EBSCO) (Case Report)
Bayraktar Barış, Bayraktar Onur, Özemir İbrahim Ali, Kızılkılıç Ebru, Öztürk Erman, Yiğitbaşı Rafet. Comparison of two minimal invasive techniques of splenectomy: Standard laparoscopy versus transumbilical multiport single-site laparoscopy with conventional instruments. J Minim Access Surg. 2015 Apr-Jun;11(2):143-148. doi: 10.4103/0972-9941.137756. (ISSN: 0972-9941) (SCI-E) (Original Article)
Bayraktar Barış, Özemir İbrahim Ali, Kefeli Umut, Demiral Gökhan, Sağıroğlu Jülide, Bayraktar Onur, Adalı Guspe, Özçelik Alp, Tortum Osman Baran. Colorectal stenting for palliation and a bridge to surgery: A 5-year follow-up study. World J Gastroenterol. 2015 Aug 21;21(31):9373-9. doi: 10.3748/wjg.v21.i31.9373. (ISSN: 1007-9327) (SCI-E) (Original Article)
Aghayeva Afag, Bayraktar Onur, Atasoy Deniz, Özben Volkan, Baca Bilgi. Excision of a Rectal Gastrointestinal Stromal Tumor Using the Transanal Minimal Invasive Surgery Technique. Dis Colon Rectum. 2015 Nov;58(11):1108. doi: 10.1097/DCR.0000000000000464. (ISSN: 0012-3706) (SCI) (Video Vignette – Case Report)
Baca Bilgi, Aghayeva Afag, Özben Volkan, Bayraktar Onur, Atasoy Deniz, Ergüner İlknur, Karahasanoğlu Tayfun, Hamzaoğlu İsmail. Robotic total proctocolectomy for ulcerative colitis – a video vignette. Colorectal Dis. 2015 Aug;17(8):736. doi: 10.1111/codi.13019. (ISSN: 1462-8910) (SCI-E) (Video Vignette – Case Report)
Özemir İbrahim Ali, Bayraktar Barış, Bayraktar Onur, Tosun Salih, Bilgiç Çağrı, Demiral Gökhan, Öztürk Erman, Yiğitbaşı Rafet, Alimoğlu Orhan. Single-site multiport combined splenectomy and cholecystectomy with conventional laparoscopic instruments: Case series and review of literature. Int J Surg Case Rep. 2016;19:41-6. doi: 10.1016/j.ijscr.2015.12.018. (ISSN: 2210-2612) (non-SCI-Emerging Sources Citation Index) (Case Report)
Özben Volkan, Cengiz Turgut Bora, Bayraktar Onur, Aghayeva Afag, Atasoy Deniz, Şisman Gürhan, Baca Bilgi. Identification of mesenteric lymph nodes in robotic complete mesocolic excision by near-infrared fluorescence imaging. Tech Coloproctol. 2016 Mar;20(3):195-6. doi: 10.1007/s10151-015-1413-3. (ISSN: 1123-6337) (SCI-E) (Video Vignette – Case Report)
Özben Volkan, Baca Bilgi, Atasoy Deniz, Bayraktar Onur, Aghayeva Afag, Cengiz Turgut Bora, Ergüner İlknur, Karahasanoğlu Tayfun, Hamzaoğlu İsmail. Robotic complete mesocolic excision for right-sided colon cancer. Surg Endosc. 2016 Oct;30(10):4624-5. doi: 10.1007/s00464-016-4786-0. (ISSN: 0930-2794) (SCI) (Video Vignette – Case Report)
Atasoy Deniz, Baca Bilgi, Özben Volkan, Bayraktar Onur, Aghayeva Afag, Aytaç Erman, Karahasanoğlu Tayfun, Hamzaoğlu İsmail. Vascular high ligation and embryological plane dissection in laparoscopic restorative proctocolectomy for ulcerative colitis – a video vignette. Colorectal Dis. 2016 Feb;18(2):218-219. doi: 10.1111/codi.13213. (ISSN: 1462-8910) (SCI-E) (Video Vignette – Case Report)
Aghayeva Afag, Baca Bilgi, Atasoy Deniz, Bayraktar Onur, Özben Volkan, Ergüner İlknur, Hamzaoğlu İsmail, Karahasanoğlu Tayfun. Robotic Complete Mesocolic Excision for Splenic Flexure of Colon Cancer. Dis Colon Rectum. 2016 Nov;59(11):1098. Doi: 10.1097/DCR.0000000000000691 (ISSN: 0012-3706) (SCI) (Video Vignette – Case Report)
Özben Volkan, Cengiz Turgut Bora, Atasoy Deniz, Bayraktar Onur, Aghayeva Afag, Ergüner İlknur, Baca Bilgi, Hamzaoğlu İsmail, Karahasanoğlu Tayfun. Is da Vinci “Xi Better than da Vinci Si in Robotic Rectal Cancer Surgery? Comparison of the 2 Generations of da Vinci Systems. Surg Laparosc Endosc Percutan Tech. 2016 Oct;26(5):417-423. Doi: (ISSN: 1530-4515) (SCI) (Original Article)
Atasoy Deniz, Aghayeva Afag, Bayraktar Onur, Özben Volkan, Baca Bilgi, Hamzaoğlu İsmail, Karahasanoğlu Tayfun. Vascular High Ligation and Embryological Dissection in Laparoscopic Restorative Proctocolectomy for Ulcerative Colitis. J Laparoendosc Adv Surg Tech A. 2017 Jan;27(1):33-35. doi: 10.1089/lap.2016.0364. (ISSN: 1092-6429) (SCI) (Original Article)
Cengiz Turgut Bora, Aghayeva Afag, Atasoy Deniz, Sapcı İpek, Bayraktar Onur, Baca Bilgi. Robotic TAPP repair of incarcerated femoral hernia with utilization of indocyanine green dye – a video vignette. Colorectal Dis. 2017 Aug;19(8):786. doi: 10.1111/codi.13787. (ISSN: 1462-8910) (SCI-E) (Video Vignette – Case Report)
Atasoy Deniz, Aghayeva Afag, Özben Volkan, Bayraktar Onur, Hamzaoğlu İsmail, Baca Bilgi. Mini-laparoscopic versus traditional laparoscopic cholecystectomy: A preliminary study. Laparosc Endosc Surg Sci. 2017; 24(4): 117-121. 10.14744/less.2017.37450 (Original Article) ) (ISNN: 2587-0610)
Atasoy Deniz, Aghayeva Afag, Bayraktar Onur, Pirinç Neslihan, Aytaç Erman, Bilgi Baca, Karahasanoğlu Tayfun, Hamzaoğlu İsmail. Robotic ventral mesh rectopexy technique for rectal intussusception with rectocele – a video vignette. Colorectal Dis. 2017 Oct;19(10):947. doi: 10.1111/codi.13847. (ISSN: 1462-8910) (SCI-E) (Video Vignette – Case Report)
Demiral Gökhan, Özçelik Alp, Özemir İbrahim Ali, Bayraktar Onur, Bölük Sümeyra, Karaca Fatih Can, Bayraktar Barış. Comparison of two laparoscopic techniques for detecting the accessory spleen: standard versus transumbilical multiport single-site laparoscopy. Biomedical Research- India 2017:28(14):6504-09. (ISSN: 0970-938X) (non-SCI-Scopus) (Original Article)
Bayraktar Onur, Aytaç Erman, Özben Volkan, Atasoy Deniz, Bilgin İsmail Ahmet, Erenler Bayraktar İlknur, Baca Bilgi, Hamzaoğlu İsmail, Karahasanoğlu Tayfun. Does Robot Overcome Obesity-related Limitations of Minimally Invasive Rectal Surgery for Cancer? Surg Laparosc Endosc Percutan Tech. 2018 Feb;28(1):e8-e11. doi: 10.1097/SLE.0000000000000500. (ISSN: 1530-4515) (SCI) (Original Article)
Aghayeva Afag, Atasoy Deniz, Bayraktar Onur, Cengiz Turgut Bora, Baghaki Semih, Baca Bilgi, Hamzaoğlu İsmail, Karahasanoğlu Tayfun. V-Y advancement flap reconstruction for anal stricture – a video vignette. Colorectal Dis. 2018 Jan;20(1):78-79. doi: 10.1111/codi.13931. (ISSN: 1462-8910) (SCI-E) (Video Vignette – Case Report)
Atasoy Deniz, Erman Aytaç, Özben Volkan, Bayraktar Onur, Erenler Bayraktar İlknur, Aghayeva Afag, Baca Bilgi, Hamzaoğlu İsmail, Karahasanoğlu Tayfun. Robotic Versus Laparoscopic Stapler Use for Rectal Transection in Robotic Surgery for Cancer. J Laparoendosc Adv Surg Tech A. 2018 May;28(5):501-505. doi: 10.1089/lap.2017.0545. Epub 2018 Jan 23. PubMed (ISSN: 1092-6429) (SCI) (Original Article)
Demiral Gökhan, Bayraktar Onur, Bölük Salih, Özçelik Alp, Özemir İbrahim Ali Bayraktar Barış. Covered self-expandable metallic stents in benign pyloric obstruction: long term results. Biomedical Research 2018; 29 (11): 2378-2384. DOI: 10.4066/biomedicalresearch.56-17-3282. (ISSN: 0976-1683) (EBSCO) (Original Article)
Özben Volkan, Aytaç Erman, Atasoy Deniz, Erenler Bayraktar İlknur, Bayraktar Onur, Sapçı İpek, Baca Bilgi, Karahasanoğlu Tayfun, Hamzaoğlu İsmail. Totally robotic complete mesocolic excision for right-sided colon cancer. J Robot Surg. 2019 Feb;13(1):107-114. doi: 10.1007/s11701-018-0817-2. (ISSN: 1863-2483) (non-SCI-Emerging Sources Citation Index) (Original Article)
Bayraktar Onur, Bayraktar Barış. The Feasibility of Conventional Forward-viewing Endoscope for Endoscopic Retrograde Cholangiopancreatography in Patients With Altered Gastrointestinal Anatomy. Surg Laparosc Endosc Percutan Tech. 2019 Feb 1. doi: 10.1097/SLE.0000000000000636. (ISSN: 1530-4515) (SCI) (Original Article)
Bayraktar Onur, Bayraktar Barış, Erenler İlknur. Can Oxidative Stress Induced by Obstructive Jaundice be Improved by Iloprost? An Experimental Study in Rats. International Journal of Scientific Research and Management (IJSRM).2019;7(3):132-138. doi: 10.18535/ijsrm/v7i3.mp01. (ISSN: 2321-3418) (Index Copernicus) (Original Article)
Konduk Buğra Tolga, Bayraktar Onur. Safety and Effectivity of ERCP In Pregnant Patients; A High- Volume Study With Long-Term Follow-Up. Turk J Gastroenterol. 2019 Sep;30(9):811-816. doi: 10.5152/tjg.2019.18799 (ISSN: 1300-4948) (SCI-E) (Original Article)
Ali Yalcinkaya, Ahmet Yalcinkaya, Bengi Balci, Can Keskin, Ibrahim Erkan, Alp Yildiz, Erdinc Kamer, Sezai Leventoglu, RIFT TURKEY Study Collaboration. Nationwide prospective audit for the evaluation of appendicitis risk prediction models in adults: right iliac fossa treatment (RIFT)—Turkey. BJS Open, 2024, zrae120. DOI: 10.1093/bjsopen/zrae120
Arslan Çiğdem, Yıldırım Yasemin, Koçak Mehmet, Bişgin Tayfun, Erenler Bayraktar İlknur, Bayraktar Onur. The 5-year outcomes and predictors of healing in chronic anal fissure treated with botulinum toxin: a retrospective analysis of 199 cases. Tech Coloproctol. 2025 May 25;29(1):122.

Articles Published in National Peer-Reviewed Journals:

Atasoy Deniz, Aghayeva Afag, Sapçı İpek, Bayraktar Onur, Cengiz Turgut Bora, Baca Bilgi. Effects of previous abdominal surgeries on laparoscopic cholecystectomy operations. Turk J Surg. 2018; (34)3: 217-220. DOI: 10.5152/turkjsurg.2017.3930. (Original Article) (TUBITAK ULAKBIM TR Index) (ISSN: 2564-6850)
Bayraktar Onur, Özçelik Abdullah Alp, Öktemgil Ahmet Ragıp, Bayraktar Barış. Intragastric balloon therapy for obesity: Is it safe and effective? Arch Clin Exp Med 2019;4(1):25-28. doi:10.25000/acem.477680. (Original Article) (TUBITAK ULAKBIM TR Index) (ISSN: 2564-6567)
Bayraktar Onur, Esen Eren, Erenler İlknur, Aytaç Erman, Bilgin İsmail Ahmet, Baca Bilgi, Güngör Mete, Karahasanoğlu Tayfun, Hamzaoğlu İsmail. Transvaginal Specimen Extraction in Minimally Invasive Colorectal Resections: Initial Experience of a Tertiary Referral Hospital. ACU Sağlık Bil Derg 2019; 10(2):231-235. Doi: 10.31067/0.2019.130 (Original Article) (TUBITAK/ULAKBIM) (ISNN: 1309- 470X)

Turkish Medical Association
Turkish Surgical Association
Turkish Society of Colon and Rectal Surgery
European Society of Coloproctology

Courses and Certificates:

Basic Statistics e-Course, 2010, Istanbul.
Laparoscopy Training Program, Istanbul University, Cerrahpaşa Faculty of Medicine, Department of General Surgery, April 2010, Istanbul.
Practical Training Program for Cadaveric Abdominal Wall and Cavity Anatomical Studies, Istanbul University, Cerrahpaşa Faculty of Medicine, Departments of General Surgery and Anatomy, June 2010, Istanbul.
Turkish Surgical Association Stapler and Its Use Training, December 2010, Istanbul.
Applied Seminar on Laparoscopic and Robotic Metabolism and Obesity Surgery, January 2011, Acıbadem University, Istanbul.
Laparoscopic Surgery Course for Abdominal Wall and Inguinal Hernias, November 2014, Izmir.
Turkish Society of Colon and Rectal Surgery 15th Laparoscopic Colorectal Surgery Course, October 2015, Istanbul.
Applied Robotic Colorectal Surgery Course, May 2016, Acıbadem University, Istanbul.
Pelvic Floor Ultrasound Course, Bahçeşehir University Faculty of Medicine, November 2017, Istanbul.
Sacral Neuromodulation Course, Dokuz Eylül University Faculty of Medicine, Izmir, December 2018.

Invited Speeches and Educational Activities at Scientific Meetings:

Anatomy in Laparoscopic Colorectal Surgery, 19th Laparoscopic Colorectal Surgery Course, November 2017, Konya.
Treatment Algorithm for Anal Fissure, 17th Congress of Colon and Rectal Surgery, September 2019, Antalya, Turkey.
Sexually Transmitted Diseases (Video Training Module), Turkish Society of Colon and Rectal Surgery, Virtual Academy, October 2020.
Treatment of Malignant Colorectal Obstruction, 18th Congress of Colon and Rectal Surgery, December 2021, Antalya, Turkey.
Constipation and Defecation Disorders, European Board of Surgery Qualification – Coloproctology Prep Course, August 2022.
Basic Principles in Intestinal Anastomosis, 19th Congress of Colon and Rectal Surgery, May 2023, Antalya, Turkey.
Pelvic and Perianal Pain, 19th Congress of Colon and Rectal Surgery, May 2023, Antalya, Turkey.
Definition, Current Diagnostic Criteria, Surgery, and Multidisciplinary Management of Constipation and Gas Management Beyond Organic Pathologies, 19th Congress of Colon and Rectal Surgery, May 2023, Antalya, Turkey.
Stapler Use in Colorectal Surgery Course Training, 19th Congress of Colon and Rectal Surgery, May 2023, Antalya, Turkey.
How to Open and Close the Abdomen? Turkish Society of Colon and Rectal Surgery Course on Abdominal Wall, Perineal, and Parastomal Hernia Prophylaxis and Repair, March 2024.
Surgical Management of Crohn’s Disease, Memorial & Cleveland Clinic Surgery Days, May 2024.
Intestinal Complications and Their Management in Minimally Invasive Surgery, Minimally Invasive Hysterectomy Course, May 2024.
Chronic Pelvic Pain, 20th Congress of Colon and Rectal Surgery, May 2025, Antalya, Turkey.

First Prize in Video Presentation

Aghayeva Afag, Atasoy Deniz, Özben Volkan, Bayraktar Onur, Baca Bilgi. Identification of regional lymph nodes using colonoscopic injection of indocyanine green and robotic fluorescence imaging in an obese patient undergoing surgery for cecal cancer. Clinical Robotic Surgery Association Worldwide Congress, October 2-3, 2015, Chicago, USA.

Third Prize in Video Presentation

Atasoy Deniz, Aghayeva Afag, Bayraktar Onur, Ergüner İlknur, Özben Volkan, Baca Bilgi, Hamzaoğlu İsmail. High vascular ligation technique in laparoscopic restorative proctocolectomy for ulcerative colitis (video presentation). 15th National Colorectal Surgery Congress, May 19-23, 2015, Antalya, Turkey.

Oral Presentation Award

Özben Volkan, Atasoy Deniz, Erenler İlknur, Bayraktar Onur, Aytaç Erman, Baca Bilgi, Karahasanoğlu Tayfun, Hamzaoğlu İsmail. Oncological outcomes of robotic complete mesocolic excision in the surgical treatment of right colon cancer. 22nd National Cancer Congress, April 19-23, 2017, Antalya, Turkey.

Assoc. Prof. MD.

Onur Bayraktar

Assoc. Prof. MD.

Onur Bayraktar

Areas of Interests

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