Prof. Dr. Necdet Özçay

Necdet Ozcay | General Surgery Specialist

VM Medical Park Keçiören Ankara

Clinical Interests

Hemorrhoid, anal fistula and fissure, hernia, pilonidal sinus and gallbladder surgery; digestive system cancer surgery.

Education and Specialization

Dokuz Eylül University Faculty of Medicine, 1987; Ankara Numune General Surgery, 1994; Türkiye Yüksek İhtisas Gastrointestinal Surgery, 2000; Associate Professor 2003, Professor 2018; organ transplantation training in Canada, USA and UK.

Scientific Publications

• S.Asfar, N.Özçay, D.Grant, W.Wall. “The use of a liver from a donor with complete situs inversus and dextrocardia”. Transplantation,  59,442-4  (1995).
• J.Fryer, D.Grant, J.Jiang, P.Metrakos, N.Özçay, B.Garcia, R.Behme, R.Zhong. “Influence of macrophage depletion on bacteriel translocation and rejection in small bowel transplantation”. Transplantation,  62, 553-9  (1996).
• Z.Zhang, L.Zhu, D.Quan, B.Garcia, N.Özçay, J.Duff, C.Stiller, A.Lazarovits, D.Grant, R.Zhong. “Pattern of liver, kidney, heart and intestine allograft rejection in different mouse strain combination”. Transplantation,  62, 1267-72  (1996).
• N.Özçay, J.Fryer, D.Grant, D.Freeman, B.Garcia, R.Zhong. “Budesonide, a locally acting steroid, prevents graft rejection in a rat model of intestinal transplantation”. Transplantation, 63, 1220-5  (1997).
• M.Çağlıkülekçi, N.Özçay, T.Oruğ, G.Aydoğ, N.Renda, F.Atalay. “The effect of recombinant growth hormone on intestinal anastomotic wound healing in rats with obstructive jaundice”. Turkish Journal of Gastroenterology, 13, 17-23  (2002).
• N.Özçay, H.Gündoğdu, T.Oruğ, F.Atalay, M.Akoğlu. “Two cases of short bowel syndrome taking restricted oral diet. Still candidates for intestinal transplantation?”. Transplantation Proceeding,  34, 872-3  (2002).
• N.Özçay, T.Oruğ, H.Gündoğdu, G.Aydoğ, N.Renda, F.Atalay, M.Akoğlu. “Short bowel syndrome impairs healing of intestinal anastomosis in rats”. Transplantation Proceeding, 34, 1028-9  (2002).
• N.Özçay, T.Oruğ, M.Çağlıkülekçi, N.Turhan, F.Atalay, M.Akoğlu. “ The effect of growth hormone therapy on the healing of small bowel anastomosis after reperfusion injury in the rat”. Transplantation Proceeding, 34, 1015-6   (2002).
• C.Kayaalp, K.Arda, T.Oruğ, N.Özçay. “Value of computed tomography in addition to ultrasound for preoperative staging of gastric cancer”. European Journal of Surgical Oncology, 28, 540-3  (2002).
• N.Özçay, K.Arda, T.Sugüneş, D.Özdemirel, G.Aydoğ F.Atalay, M.Akoğlu. “Polyarteritis nodosa presented with  necrotising appendicites and hepatic aneurysm rupture”. Turkish Journal of Gastroenterology, 2003;14(1): 68-70.
• F.Atalay, N.Özçay, H.Gündogdu, T.Oruğ, A.Güngör, M.Akoğlu.      Evaluation of the outcomes of short bowel syndrome and indications  for intestinal transplantation. Transplant Proceeding   2003;35(8):3054-6
• T.Oruğ, K.Arda, Ö.Tosun, N.Özçay, S.A.Atan.  The value of computed  tomography in the diagnosis of acute necrotising  pancreatitis in a renal  transplant patient. HPB  2004; 6 (1):49-51.
• Kayhan B, Özer D, Akdoğan M, Tekin I, Özçay N. Hypoplastic pancreas and ectopic spleen as an abdominal mass:a case report . Turk J Gastroenterol 2006; 17(3): 216-8.
• Üzüm N, Özçay N, Ataoğlu Ö. Benign multicistic peritoneal mesothelioma: Turk J Gastroenterol 2009; 20(2): 138-41.
• Ozdemir S, Gülpınar K, Leventoğlu S, Aydın S, Özçay N. A case report of intestinal obstruction due to phytobezoar within Meckel’s diverticulum. Turk J Gastroenterol. 2009; 20(1): 76-7.
• Koçak B, Orug T, Turhan N, Özçay N, Gönenç F. CD44 expression in renal ischemia-reperfusion injury in rats. Int Urol Nephrol  2009; 41(4): 791-4.
• Özdemir S, Gülpınar K, Leventoğlu S, Uslu HY, Turkoz E, Özcay N, Korkmaz A. Torsion of the primary epiploic appendajitis: a case series and review of the literature. Am J Surg 2010; 199(4): 453-8.
• Turk E, Karagulle E, Turan H, Oguz H, Abali ES, Özcay N, Moray G, Haberal M. Successful Skin Homografting From an Identical Twin in a Severely Burned Patient.J Burn Care Res. 2013; 35(3): E177-E179.
• Soylu L, Aydın OU, Aydın S, Özçay N. Invagination of the appendix due to endometriosis presenting as acute appendicitis. Turk J Surg 2014; 30(2):106-8.
• Özçay N, Özant A, Arslan K, Besim H. Analysis of plasma biomarkers as an indicator for early diagnosis of acute mesenteric ischemia in rat. Archives of the Balkan Medikal Union.1017;52(2):135-143.
• Özçay N. Surgical technique for orthotopic small bowel transplantation in a rat. Indian J Transplant 2017;11:66-9.
• Özçay N. Acute rejection pattern of an outbred strain combination on mouse-to-rat heterotopic heart xenotranspnatation. Transplantation Proceedings 2017; 49:2215-2218.
• Özçay N, Özdemir H. A novel model of mouse-to-rat kidney xenotransplantation. Transpnatation Proceedings 2017;49:2204-2208.
• Özçay N, Özdemir H, Besim H. Protective effect of probiotics on the healing of colon anastomosis after ischemia and reperfusion injury in rats. Archives of the Balkan Medical Union 2017; 52(4):1-6.
• Özçay N, Özdemir H, Besim H. Role of platelet-rich fibrine on intestinal anastomosis wound healing in a rat. Biomed Mater 2018;13(4):045006. doi: 10.1088/1748-605X/aab8e1.
• Özant A, K Arslan, N.Özçay, H Besim. Adult multicentric Burkitt lymphoma presenting with bowel obstruction due to intussusception. Turk J Gastroenterol 2018;29:361-4.
• Özçay N. Reply. Reply to comment on “role of platelet-rich fibrine on intestinal anastomosis wound healing in a rat”. Biomed Mater 2018;13: 068002.
• N.Özçay, I.Brosova, M.Ferkodic, A.Özant, K.Arslan, H.Besim. Two cases of intestinal injuries due to seat belt without sealt belt sign. Journal of Surgical Case Reports, 2018; 11:1-3.
• Arslan K, Özant A, Özçay N, Besim H.Protoscolicidal effect of Oleuropein: An invitro study. Turk J Surg, 2019;1;35(1):30-34.
• N.Özçay, A.Özant, K.Arslan, H.Özkayalar, H.Besim. Platelet-rich fibrin can accelerate the healing of common bile duct anastomosis in a rat. Turk J Surg, 2020;36(3):256-63.
• N.Özçay, A Özant, K.Arslan, H.Besim. Intussusception of the ceacum and terminal ileum through a colostomy.Chirurgia, 2021 April;34(2):86-7.
• COVIDSurg Collaborative,GlobalSurg Collaborative. SARS-CoV-2 vaccination modelling for safe surgery to save lives:data from an international prospective cohord study.British Journal of Surgery, 2021,1-8 DOI:10.1094/bjs/znab101.
• COVIDSurg Collaborative; GlobalSurg Collaborative.Timing of surgery following SARS- CoV-2 infection: an international prospective cohort study. Anaesthesia. 2021 Jun;76(6):748-758. doi: 10.1111/anae.15458. Epub 2021 Mar 9.PMID: 33690889.
• COVIDSurg Collaborative; GlobalSurg Collaborative. Effects of pre-operative isolation on postoperative pulmonary complications    after elective surgery: an international prospective cohort study. Anaesthesia. 2021 Aug 9. doi: 10.1111/anae.15560.
• COVIDSurg Collaborative; GlobalSurg Collaborative. SARS-CoV 2 infection and venous thromboembolism after surgery:an international prospective cohort study. Anaesthesia 2022 Jan;77(1):28-39.
• COVIDSurg Collaborative; GlobalSurg Collaborative. Effect of COVID-19 pandemic lockdowns on planned cancer surgery for 15 tumour types in 61 countries: an international, prospective, cohort study.Lancet Oncol. 2021 Nov;22(11):1507-1517.
• Siriwardena AK; CHOLECOVID Collaborative. Global overview of the management of acute cholesistitis during the COVID-19 Pandemic (CHOLECOVID study). BJS Open. 2022 May 2;6(3):zrac052.
• COVIDSurg Collaborative. The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study. Colorectal Dis. 2022 Mar 14.
• Fotopoulou C, Khan T, Bracinic J and COVIDSurg Gynecological Cancer Collaborators. Outcomes of gynecologic cancer surgery during the COVID-19 pandemic: an international, multicenter, prospective CovidSurg-Gynecologic oncology cancer study. Am J obstet Gynecol. 2022 Nov:227(5):735.e1-735.e25. doi: 10.1016/j.ajog.2022.06.052. Epub 2022 Jun 30.
• A.Özant, K.Arslan, N.Özçay, H.Besim. Abdominal cacoon: A rare cause of intestinal obstuction. A case report. Cyprus J Med Sci 2022;7(5):692-694. Doi: 10.4274/cjms.2020.1761
• NIHR Global Health Research Unit on Global Surgery and the GlobalSurg Collaborative. Safety and equity in scaling minimally invasive surgery worlwide in 109 countries using cholecystectomy as a tracer procedure: a prospective cohort study.Lancet Glob Health 2026; 14:e199.
• R.Zhong, Z.Zhang, L.Zhu, N.Özçay, D.Grant. “The mouse small bowel, kidney, liver and heart transplantation at the University of Western Ontario”. (sözlü bildiri) Uluslararası 2. Deneysel Mikrocerrahi Kongresi, Kanazawa, Japonya, 1994.
• LH.Chow, S.Huh, J.Jiang, N.Özçay, R.Zhong, JG.Pickering. “Intimal thickening develops without humoral immunity in a mouse aortic allograft model of chronic vascular rejection”. (sözlü bildiri) 45. American College of Cardiology Kongresi, Orlando, ABD, 1996. J Am Coll Cardiol 27(suppl A):16A  1996.
• D.Freeman, N.Özçay, R.Zhong, D.Grant, B.Garcia, J.Fryer. “Prevention of small bowel allograft rejection with cyclosporine and budesonide, a locally acting glucocorticoid”. (sözlü bildiri) Kanada ve İngiliz Farmakoloji Dernekleri Ortak Kongresi, University of Bath, Kanada, 1996. (Br J Pharmacol  119:P81 Suppl  1996).
• N.Özçay, M.Valvano, R.Zhong, B.Garcia, L.Dafoe, D.Grant.  “Non-toxic lipopolisaccharide, a novel immune suppressive agent, prevents intestinal graft rejection in the rat”. (sözlü bildiri) ASTS, 22. Kongresi, Dallas, ABD, 1996.
• Z.Zhang, R.Zhong, N.Özçay, C.Le Feuvre, B.Garcia, M.White, C.Stiller, A.Lazarovits. “Prevention of heart allograft and kidney xenograft rejection by monoclonal antibody to CD45RB”. (sözlü bildiri) 16. Uluslararası Transplantasyon Kongresi,   Barcelona, İspanya, 1996.
• H.Gündoğdu, N.Özçay, C.Kayaalp, G.Neşşar, T.Oruğ, A.Demirbağ, F.Atalay, M.Akoğlu. “Permanent access hepaticojejunostomy: Report of 30 cases”. (sözlü bildiri) Avrupa Cerrahi Kongresi, İstanbul, 2000.
• G.Neşşar, C.Kayaalp, A.Demirbağ, T.Oruğ, N.Özçay, M.Akoğlu. “A novel flap technique for pilonidal sinus”. (video sunumu) Avrupa Cerrahi  Kongresi, İstanbul, 2000.
• C.Kayaalp, T.Oruğ, S.Yol, G.Neşşar, N.Özçay, F.Atalay. “Is computed tomography necessary preoperatively for gastric cancer?”. (sözlü bildiri) Avrupa Cerrahi  Kongresi,  İstanbul, 2000.
• N.Özçay, T.Oruğ, F.Atalay, H.Gündoğdu, C.Kayaalp.  “ Two cases of short bowel syndrome taking restricted oral diet. Still candidates for intestinal transplantation?” (poster sunumu) 7. Uluslararası  İnce Barsak Transplantasyonu Kongresi, Stockholm, İsveç, 2001.
• N.Özçay, T.Oruğ, H.Gündoğdu, G.Aydoğ, N.Renda, F.Atalay, M.Akoğlu. “Short bowel syndrome delays the  healing of intestinal anastomosis in the rat”. (poster sunumu) 7. Uluslararası  İnce Barsak Transplantasyonu Kongresi, Stockholm, İsveç, 2001.
• N.Özçay, T.Oruğ, M.Çağlıkülekçi, C.Kayaalp, N.Turhan, M.Akoğlu. “ The effect of growth hormone therapy on the healing of small bowel anastomoses after reperfusion injury in the rat”. (sözlü bildiri) 7. Uluslararası  İnce Barsak Transplantasyonu Kongresi, Stockholm, İsveç, 2001.
• S.Leventoğlu, N.Özçay, S.Özdemir, K.Gülpınar, F.Küçükel. Torsion of the epiploic appendix mimicking acute appandicities. (poster) 11 nci Uluslararası Kolon ve Rektum Cerrahisi Kongresi, İstanbul, 2006.
• N. Özçay, Moray G, Haberal M. Inbred and outbred rat model of intestinal transplantation (Poster). Uluslar arası İnce barsak transplantasyonu kongresi, Oxford, İngiltere, 2013.
• N. Özçay,  Moray G,  Haberal M.   A modified technique for heterotopic heart xenotransplantation from mouse to rat (Poster).  Joint Congress of 12th International-Xenotransplantation-Association and Organ Transplantation in ABO-incompatible and Hyperimmunized Recipients.  Osaka, JAPAN ,  NOV 10-13, 2013 XENOTRANSPLANTATION   Volume: 20   Issue: 5   Special Issue: SI   Pages: 379-379 ,  SEP 2013
• N.Özçay, H.Özdemir, M.Haberal. Acute rejection pattern of outbred rats to heterotopic heart transplantation. (poster). 26 ncı uluslararası transplantasyon kongresi, Hong Kong, 2016. (Transplantation July 2016, Volume 100 Suppl 7S, P:878)
• N.Özçay, M.Haberal. Surgical technique of harvesting two kidneys from a Mouse for xenotransplantation studies (poster). 26 ncı uluslararası transplantasyon kongresi, Hong Kong, 2016. (Transplantation July 2016, Volume 100 Suppl 7S, P:878)
• N. Özçay, M.Haberal, EY. Akçay, B.Altun, Y.Deveci, E.Ermin, S.Gülay, C.Haberal. The effect of probiyotics on the healing of colon anastomosis after ischemia and reperfusion injury in the rat. (sözlü). 26 ncı uluslararası transplantasyon kongresi, Hong Kong, 2016. (Transplantation July 2016, Volume 100 Suppl 7S, P:391)
• M.Haberal, H.Özdemir, N.Özçay, Z.Ersoy, A.Torgay. Prevention of vascular stricture by using an expanded polytetrafluoroethylene (ePDFE) graft in a porcine model:preliminary study (poster). 26 ncı uluslararası transplantasyon kongresi, Hong Kong, 2016. (Transplantation July 2016, Volume 100 Suppl 7S, P:684)
• M.Haberal, H.Özdemir, N.Özçay, Z.Ersoy, A.Torgay. Bridging technique of bile duct anastomosis using an expanded polytetrafluoroethylene (ePDFE) graft in a porcine model (poster). 26 ncı uluslararası transplantasyon kongresi, Hong Kong, 2016. (Transplantation July 2016, Volume 100 Suppl 7S, P:684)
• N.Özçay, H.Özdemir. Histopathologic appearence of an outbred mouse to rat strain combination on kidney xenotransplantation (poster). 14 ncü Uluslararası Xenotransplantasyon Kongresi, Baltimore ABD, 1017. (Xenotransplantation 2017; 24:e12328, P:91   DOI:10.1111/xen.12328)
• N.Özçay, H.Besim, H.Özkayalar. Efficacy of platelet-rich fibrin on bile duct anastomosis in a rat. Transplantation:July 2018-Volume 102-Issue-p S885.
• N.Özçay, H.Besim, H.Özkayalar. The effect of preconditioning with probiotic to intestinal regrowth on short bowel syndrome in rats. Transplantation:July 2018-Volume 102-Issue-p S97.
• S.Seçkin, F.Aksoy, A.Korkmaz, Z.Şenel, N.Özçay, “Karaciğerin inflamatuar pseudotümörü”. Ankara Patoloji Bülteni, 1993; 10, 59-61.
• N.Özçay, R.Zhong, D.Grant, “İnce barsak transplantasyonundan sonra intestinal allogreft mikrosirkülasyonunda meydana gelen değişikliklerin intravital videomikroskopik analizi”. Ulusal Cerrahi Dergisi, 1995; 11, 227-33.
• N.Özçay, R.Zhong, BM.Garcia, D.Grant, “Kalp allograft rejeksiyonunun CD45RB monoklonal antikorlar ile inhibe edilmesi”. Ulusal Cerrahi Dergisi, 1995; 11,      372-6.
• F.Ercan, O.Hamamcı, H.Besim, N.Özçay, A.Korkmaz, “1057 Tiroidektomi olgusunun retrospektif analizi”. Ulusal Cerrahi Dergisi, 1995; 11, 191-7.
• N.Özçay. “İnce Barsak Transplantasyonu: Endikasyon ve sonuçları”. Ulusal Cerrahi Dergisi, 2000; 16, 15-24.
• N.Özçay, M.Valvano, B.Garcia, L.Dafoe, R.Zhong, “Non-toxic lipopolisaccharide in combination with cyclosporin A prevents intestinal graft rejection in the rat”.  Clinical and Experimental Surgery, 2000; 8, 2-9.
• N.Özçay, A.Korkmaz, N.Aras. “Modifiye Shouldice yöntemi ile kasık fıtığı onarımı”. Klinik Bilimler ve Doktor Dergisi, 2000; 6, 460-4.
• N.Özçay, H.Gündoğdu, S.Yılmaz, G.Neşşar, M.Akoğlu. “Kalıtsal protein S eksikliği ve aktive protein C direncine bağlı superior mezenterik ven trombozu. Olgu sunumu”.  Çağdaş Cerrahi Dergisi, 2001; 15, 58-60.
• N.Özçay, H.Gündoğdu, C.Kayaalp, T.Oruğ, M.Akoğlu. “İntestinal transplantasyon adayı çok kısa barsak sendromu. Olgu Sunumu”. Çağdaş Cerrahi Dergisi, 2001; 15, 179-80.
• T.Oruğ, N.Özçay, H.Gündoğdu, N.Turhan, M.Akoğlu, F.Atalay. “Mekanik barsak obstruksiyonu oluşturulan ratlarda büyüme hormonu ve pentoksifilin kullanılmasının intestinal anastomoz yara iyileşmesi üzerine etkisi”. Ankara Cerrahi Dergisi, 2001;3,  192-7.
• N.Özçay, H.Gündoğdu, N.Turhan, G.Aydoğ, T.Oruğ, F.Atalay, M.Akoğlu. “Erken mide kanseri. 14 yılda izlenen 60 olgunun sonuçları”. Ankara Cerrahi Dergisi, 2002; 4, 105-12.
• N.Özçay, T.Oruğ, H.Gündoğdu, F.Atalay, M.Akoğlu, “Kısa barsak sendromu: Kime ne zaman intestinal transplantasyon?”. Ankara Cerrahi Dergisi, 2002; 4, 113-9.
• M.Ulaş, N.Özçay, A.Bostanoğlu, S.Işık, M.Şavkılıoğlu, F.Atalay. “Prolen mesh ile tension-free herni onarımı. 42 aylık takip sonuçları”. Klinik Bilimler ve Doktor Dergisi,    2002; 8, 595-8.
• N.Özçay, M.Ulaş, A.Bostanoğlu, G.Aydoğ, N.Turhan, F.Atalay, M.Akoğlu. “Pankreas endokrin tümörleri. Cerrahi tedavi sonuçları”. Ankara Cerrahi Dergisi 2002;4(4):1-5.
• B.Baydar, N.Özçay, M.Akoğlu. Uveal malign melanomanın karaciğer metastazı- Bir olgu sunumu.   Akademik Gastroenteroloji Dergisi   2003; 2(3): 152-4.
• B.Baydar, N.Özçay, C.Keçe, F.Atalay. Pakreas pseudokisti pankreas kanseri tanısında gecikmeye neden olur mu? Olgu sunumu. Akademik Gastroenteroloji Dergisi  2004;3:144-6.
• B.Baydar, F.Atalay, A.E.Demirbağ, T.Dalgıç, N.Özçay. Mide adenokarsinomlu total situs inversus: Olgu Sunumu.Akademik Gastroenteroloji Dergisi 2005;4(3):205-7.
• B.Baydar, M.Arhan, İ.Özer, G.Aydoğ, N.Özçay, T.Dalgıç, F.Atalay. Yetmiş bir yaşında over kist torsiyonu olan over teratomu. Akademik Gastroenteroloji Dergisi 2005;4(3):202-4.
• M.Akdoğan, N.Özçay, N.Doğrucan, S.Kaçan, B.Kayhan, ZMY. Kılıç, M.İbiş, O.Yüksel. Karaciğer transplantasyon önceliğini belirlemede hangi model etkin; MELD skoru? CHILD skoru ? Akademik Gastroenteroloji Dergisi 2008;7(2):73-6.
• S.Leventoğlu, S.Özdemir, N.Özçay, H.Uncu, F.Küçükel, K.Gülpınar. Pilonidal sinüs tedavisinde primer kapama ile Limberg flap sonuçlarının karşılaştırılması. Kolon Rektum Hastalıkları Dergisi 2008;19:90-92.
• L.Soylu, U Aydın, S Aydın, N.Özçay. Akut apandisite neden olan endometriozise bağlı appendiks invaginasyonu. Ulusal Cerrrahi Dergisi 2014:30:106-8.
• K.Arslan, A.Özant, N.Özçay, H.Besim. Postsplenektomik sepsis sendromu. Akademik Gastroenteroloji Dergisi. 2017;16(2):82-84.

Book Chapters

• Z.Zhang, L.Zhu, N.Ozcay, J.Duff, D.Grant, R.Zhong. “The mouse small bowel, kidney, liver and heart transplantation at the University of Western Ontario”. Recent Advance in Experimental Microsurgery, Editör: Teruho Kajimoto, Hideki Kitatani. Noto Printing Company, Japan, 1996: 75-80.
• N.Özçay. “İnce barsak transplantasyonu”, Temel ve Sistematik Cerrahi ,  Editör:  Hüseyin Gülay, İzmir Güven Kitapevi, 2005; 761-76.
• N.Özçay. “Pankreas  transplantasyonu”,  Temel ve Sistematik Cerrahi,   Editör:  Hüseyin Gülay, İzmir Güven Kitapevi, 2005; 761-76.
• S.Coşkun, S.Aydın, N.Özçay. Akut karın ağrısı olan yaşlıya yaklaşım. Geriatrik Geropsikiyatrik Aciller. Editörler: Ahmet Turan Işık, Engin Eker. Som Kitap 2009; 195-218.