Constantine's days
Of Coloproctology 2026

Prof. Antonino Spinelli is the Director of the Division of Colon and Rectal Surgery and Full Professor of Surgery at Humanitas University in Rozzano, Milan. He earned his MD from the University of Milan in 2001 and received multiple scholarships during his training, including a two-year fellowship at Charité – University of Berlin, Department of General, Visceral and Transplantation Surgery.

He is a frequent invited speaker at national and international meetings, with more than 315 lectures on minimally invasive colorectal cancer surgery and the management of inflammatory bowel disease.

Dr. Amjad Parvaiz is a visiting consultant surgeon at Poole NHS Foundation Trust in the UK and is Head of the Laparoscopic and Robotic Colorectal Unit at the Champalimaud Foundation in Lisbon, Portugal. He holds a personal chair at the University of Portsmouth affiliated with the Faculty of Health Science in Portsmouth, UK. He is also Director and Founding Member of the European Academy of Robotic Colorectal Surgery (EARCS) since 2014

Associate Professor of Surgery. From 1993 to date he has been working as head of the colorectal surgical department at Vienna university hospital and obtained teaching qualification for surgery in 1994. Furthermore he is in charge of the postgraduate training for surgery within the Austrian Medical Society. Since October 2003 he has been holding the position as deputy head of the department of general surgery at Vienna University Hospital.

Dr Dursun Bugra is a specialist in general and digestive surgery with extensive experience in digestive system surgery (esophagus, stomach, small intestine, colon, rectum, anus, and gallbladder) and oncologic surgery, with a particular focus on tumors and sarcomas.
In addition, he is engaged in abdominal wall and hernia surgery, as well as laparoscopic and minimally invasive surgery, emphasizing modern techniques that enable faster recovery and improved postoperative outcomes.

He was born in Zagreb and completed primary school and classical high school in Split. He obtained his medical degree, master’s degree, and PhD from the University of Zagreb School of Medicine. He has been a specialist in general surgery since 1988 and earned the title of Primarius in 2001. His subspecialization in digestive surgery was recognized in 2003. He has also been certified in emergency medicine and holds a subspecialization in surgical oncology.

Since 2018, he has held the prestigious international title FACS (Fellow of the American College of Surgeons).

Senior physician at the department of general surgery at Vienna University hospital, consultant physician in internal medicine and oncology. She is the author of several books on diet and nutrition giving useful recommendations for developing a healthy diet helping to increase the body’s recovery process after chemotherapy. Any reader will enjoy her practical, real-life approach to incorporating changes.

Mariana Berho, M.D., Chairman of the Department of Pathology and Laboratory Services, has been named Chief of Staff at Cleveland Clinic Weston. Dr. Berho, who has been with Cleveland Clinic Weston since 2000, is also Chief Wellness Officer for Cleveland Clinic’s Florida region.
Board certified in Anatomic and Clinical Pathology, Dr. Berho completed fellowship training in Immunopathology at the University of Miami and Oncologic Surgical Pathology at Memorial Sloan Kettering in New York, NY.
Dr. Berho obtained her medical degree from the University of Buenos Aires in Argentina and completed residencies in West Virginia University in Morgantown, WV, and Mount Sinai Medical Center in Miami Beach, where she was Chief Resident. She recently obtained a Masters’ Degree in Conflict Analysis and Resolution from Nova Southeastern University in Davie, Florida.

He graduated in Medicine from the Medical University of Varna in 1983 with the highest honors. Since 1988, he has been working as an assistant at the Department of Surgical Diseases, Medical University of Varna. He holds specializations in surgery and oncology, as well as a master’s degree in health management.

Since 1992, he has served as a senior assistant at the Clinic for Hepato-Biliary Surgery at the Medical University of Varna. Since 2003, he has been the Head of the Second Surgical Clinic at the University Hospital “St. Marina” in Varna.

From 2004 to 2012, he held the position of Vice-Rector for Scientific Research at the Medical University of Varna (two terms). Since 2012, he has been the Head of the Department of Surgical Diseases, and between 2012 and 2020, he served as Chairman of the Academic Senate of the Medical University of Varna.

Dr. Aleksandar Karamarković is a specialist in general surgery. He is a Professor at the Department of Surgery and Anesthesiology, Faculty of Medicine, University of Belgrade, as well as the Head of the Teaching Base — Clinic for Surgery “Nikola Spasić” at the University Clinical Center “Zvezdara,” where he also serves as Director.

He is a member of the American College of Surgeons and the Russian Academy of Natural Sciences.

Doc. Dr. Danijel Galun is a specialist in general surgery based in Belgrade, with many years of professional experience.

His main areas of expertise include hepatobiliary and pancreatic surgery, as well as liver surgery. Dr. Galun successfully performs TACE — transarterial chemoembolization of the liver — in patients who, unfortunately, are not candidates for liver resection.

In addition to his daily medical practice, he is also engaged in teaching. He serves as an Assistant Professor at the Department of Surgery and Anesthesiology, Faculty of Medicine, University of Belgrade.

Dr. Dejan Ivanov is a specialist in surgery based in Novi Sad. He is an expert in abdominal, colorectal, and hepatobiliary surgery.

He has completed professional training both in Serbia and abroad.

Dr. Ivanov has participated in numerous conferences and delivered many lectures on colorectal and pancreatic surgery. He is also a lecturer in the field of laparoscopic surgery and serves as a university professor.

Prof. Dr. Dejan Radenković is a specialist in general surgery with a subspecialization in emergency surgery, based in Belgrade.
He is one of the leading experts in the treatment of pancreatic cancer.

Prof. Radenković works at the Clinic for Digestive Surgery and also in private practice. He is a Professor at the Department of Surgery, Faculty of Medicine, University of Belgrade.

Prof. Dr. Dragan Radovanović is a specialist in surgery and anesthesiology based in Belgrade. He has many years of experience in colorectal surgery.
His subspecialty also includes sports medicine.

Prof. Radovanović is an active lecturer at both international and national conferences. He is the author and co-author of more than 80 published papers in scientific journals and presentations at congresses across Europe. He is also a member of numerous medical associations.

Clinical Assistant at the Department of Surgery and Anesthesiology, Faculty of Medicine, University of Belgrade.
Specialist in General Surgery.

Head of the Department of Surgical Intensive Care, Clinic for Emergency Surgery, Emergency Center, University Clinical Center of Serbia, Belgrade.

Prof. Dr. Goran Barišić is a distinguished specialist in general surgery and a subspecialist in digestive and colorectal surgery, with many years of experience working with patients in Belgrade.

He is a member of numerous medical associations and actively participates in important conferences both in Serbia and abroad.

He works at the First Surgical Clinic of the Clinical Center of Serbia.

Doc. Dr. Sci. Med. Ivan Dimitrijević is a specialist in general surgery with decades of experience in treating diseases of the colon, anal canal, and pelvic floor. He completed his specialization at the Faculty of Medicine, University of Belgrade.

In his daily practice, he combines minimally invasive and traditional surgical techniques, with a strong focus on patient safety, precision, and faster recovery.

He is employed at the First Surgical Clinic of the University Clinical Center of Serbia.

Assistant Professor at the Department of Surgery and Anesthesiology, Faculty of Medicine, University of Belgrade.
Specialist in General Surgery and Subspecialist in Emergency Surgery.

Head of the First Surgical Department, Clinic for Emergency Surgery, Emergency Center, University Clinical Center of Serbia, Belgrade.

Dr. Milan Breberina is a specialist in surgery and oncology based in Novi Sad. His surgical work focuses on operations of the colorectum, hernias, fistulas, and hemorrhoids.

He is currently retired but continues to work as a medical consultant for several private clinics in Vojvodina.

Dr. Breberina has been a member and president of numerous surgical associations and has delivered many lectures at national and international conferences.

A specialist in general surgery and proctology from Niš, with many years of experience in diagnosing and treating diseases of the distal colon and rectum. After graduating from the Faculty of Medicine in Niš, she completed her specialization in general surgery and doctoral studies, after which she worked as an assistant at the same faculty.

In addition to her academic career, Dr. Nestorović has extensive clinical experience. Since 2010, she has been working at the Clinic for Digestive Surgery, University Clinical Center of Niš.

She continued her professional development in Germany, where she gained additional knowledge and skills.

Prof. dr Vesna Kesić, gynecologic oncologist, is a Full Professor at the Faculty of Medicine, University of Belgrade.

She is one of the leading specialists in gynecologic oncology in Serbia. In 2002, she was nominated as an Advisor to the Minister of Health of Serbia. From 2008 to 2012, she served as President of the National Expert Committee for the Prevention and Early Detection of Cervical Cancer.

In 2014, she became a member of the National Expert Committee for Monitoring the Implementation of the Early Cancer Detection Program of the Ministry of Health of the Republic of Serbia, and until 2019, she chaired the subgroup for cervical cancer.

She is employed at the Clinic for Gynecology and Obstetrics, Clinical Center of Serbia.

Prof. Dr. Vladimir Đukić is an accomplished surgeon and the long-standing Director of the University Hospital Center “Dr Dragiša Mišović – Dedinje,” successfully navigating the world of medicine for decades.

He graduated from the Faculty of Medicine, University of Belgrade, and is the author of numerous studies and scientific papers. From 1987 to 1994, he worked at the Emergency Center. Between 1998 and 2000, he served as the Director of the Emergency Center of the Clinical Center of Serbia.

In 2005, he became Head of the Department for Abdominal and Thoracic Trauma, and in 2008, Head of the Surgery Center of the Emergency Center, Clinical Center of Serbia. From 2008 to 2012, he held the position of Director of the Emergency Center of the Clinical Center of Serbia.

Prof. Dr. Zoran Radovanović is a specialist in surgery and oncology based in Novi Sad, with many years of experience in colorectal surgery.

He is the Head of the Surgical Department at the Clinic for Operative Oncology, Institute of Oncology of Vojvodina.

In 2016, Dr. Radovanović was appointed Director of the Institute of Oncology of Vojvodina. He is also a Professor at the Faculty of Medicine, University of Novi Sad.

He has undergone advanced training in breast cancer surgery, sentinel node procedures for breast cancer, and reconstructive breast operations.