Best Gastroscopy with Biopsy Doctors Abroad

Professor Amit Tirosh is the Head of Neuroendocrine Tumors Service at Sheba Medical Center. He specializes in identifying and treating tumors found during gastroscopy with biopsy.

• Published research in Gastroenterology and JAMA on tumor detection and management
• Completed expert training at the National Institutes of Health in the United States
• Consults for international panels on hereditary syndromes that cause digestive system tumors
• Member of the European Neuroendocrine Tumors Society
• Leads a dedicated laboratory focused on advanced endocrine oncology research

Dr. Yuri Goldes is the Deputy Director of General Surgery at Sheba Medical Center. He pioneered some of Israel’s first robotic resections for stomach and pancreatic cancers. Forbes Israel named him among the nation’s best gastrointestinal surgeons. In 2019, he received the Best Doctor of the Year award from the Israeli Ministry of Health.

• Specializes in robotic and laparoscopic surgery for pancreatic, gastric, and esophageal cancers.
• Performs minimally invasive Whipple procedures, one of the most complex abdominal operations.
• Treats benign conditions including diaphragmatic hernia, achalasia, GERD, and gallbladder disease.
• Works at Sheba Medical Center, ranked among the Top 10 hospitals worldwide by Newsweek.

Professor Xiao Yueyong is Chief Physician in the Department of Radiological Diagnosis at the Chinese PLA General Hospital. He is a leading expert in minimally invasive interventional oncology. He serves as the inaugural President of WATA (2025–). He is President of the International (2020–) and Asian (2012–) Societies of Cryotherapy. He is also Deputy Head of the NHC Expert Group on tumour ablation regulations (2009–).

He has performed over 100,000 CT/MRI‑guided minimally invasive procedures. His work covers chemical ablation, RFA, MWA, cryoablation, and NanoKnife (IRE). He introduced and advanced NanoKnife ablation in China. He led the first national standards for tumour cryoablation and NanoKnife.

Honors include the National Special Contribution Award (Lifetime Honorary). He received First Prize from the Chinese Medicine Education Association (2021). He received two Second Prizes for Military Medical Achievements (2016, 2018) and two Second Prizes from the China Anti‑Cancer Association (2019, 2022). He was named Asian Ablation Master. His research record includes 13 Chinese patents. He is the principal investigator for four NSFC projects and one MOST subject. He has published over 200 papers, with over 110 as first or corresponding author and over 40 in SCI journals. He has led over 10 ablation guidelines or consensus statements.

Dr. Tarik Akar specializes in advanced endosurgery and oncology at Hisar Hospital Intercontinental. He uses gastroscopy with biopsy to ensure diagnostic precision for complex digestive disorders.

• Performs ESD to remove early-stage esophageal and gastric cancers during endoscopy
• Treats conditions like Barrett's esophagus and chronic gastric ulcers
• Won the Best Verbal Presentation Award at an international gastrointestinal cancer congress
• Published 25 research papers in local and global medical journals
• Experienced in treating inflammatory bowel diseases like Crohn's and ulcerative colitis

Dr. Michal Kazanowski is an endoscopic surgeon at KCM Clinic in Poland. He specializes in general and oncological surgery with a focus on obesity. Dr. Kazanowski is a leading expert in the Allurion Programme for non-surgical weight loss. He uses gastric balloons to help patients achieve sustainable health results.

• Specializes in non-invasive weight loss methods and endoscopic obesity treatments.
• Performs endoscopic sleeve gastroplasty (ESG) and gastric balloon placements.
• Conducted international medical webinars on non-surgical obesity management.
• Works at ISO-accredited KCM Clinic, which serves over 700 international patients annually.

Dr. Merve Karli is a general surgeon at Hisar Hospital Intercontinental in Istanbul. She has performed over 1,000 operations for hernias, breast diseases, and anorectal conditions. Dr. Karli trained at Eskisehir Osmangazi University and Sadi Konuk Training and Research Hospital. She holds official certifications to perform endoscopic procedures.

• Specializes in laparoscopic and open hernia repair, including umbilical and incisional cases.
• Performs gastroscopy, colonoscopy, and PEG insertion for diagnostic and therapeutic needs.
• Treats benign anorectal diseases and manages complex breast disease cases.
• Works at Hisar Hospital, a JCI-accredited facility serving 500,000+ patients annually.

Dr. Engin Tutar is a pediatric gastroenterologist at Hisar Hospital Intercontinental in Istanbul. He is the former head of Pediatric Gastroenterology at Marmara University. Dr. Tutar has delivered over 50 presentations at national and international medical congresses. He specializes in treating complex digestive, liver, and nutritional disorders in children.

• Performs diagnostic and therapeutic endoscopy, including polypectomy and esophageal variceal bleeding control.
• Treats inflammatory bowel disease, Celiac disease, and H. pylori infections.
• Manages chronic pediatric conditions such as growth disorders and liver diseases.
• Works at JCI-accredited Hisar Hospital, which treats over 500,000 patients annually.

Professor Omer Necip Aytug leads gastroenterology at Hisar Hospital Intercontinental. He performs gastroscopy with biopsy to identify digestive disorders and gastric polyps.

• Earned his professorship at Abant Izzet Baysal University – a top Turkish medical school
• Completed a specialized gastroenterology fellowship at Marmara University School of Medicine
• Expert in treating Barrett's esophagus and chronic inflammatory bowel diseases
• Actively publishes clinical findings in both Turkish and international medical journals
• Member of the medical faculty at Duzce University School of Medicine

Dr. Ayhan Erdemir is a general surgeon at the JCI-accredited Anadolu Medical Center. He uses gastroscopy with biopsy to diagnose stomach cancer and other complex digestive conditions.

• Assistant Professor at Maltepe University Medical School – helps train future surgeons
• Certified in robotic-assisted surgery for high precision during gastrointestinal procedures
• Completed specialized training in cytoreductive surgery for abdominal cancers
• Member of the Turkish Surgical Association with recertification in surgical qualifications
• Performs complex stomach cancer procedures alongside diagnostic evaluations

Professor Zulfikar Polat is a senior gastroenterologist at Anadolu Medical Center. He specializes in interventional endoscopic operations including gastroscopy with biopsy.

• Trained at Ankara Gulhane Military Medical Academy in internal medicine and gastroenterology
• Practices at a center affiliated with Johns Hopkins Medicine
• Member of the European Society of Gastrointestinal Endoscopy
• Authored 45 national and international medical publications
• Expert in hepato-pancreatology and inflammatory intestinal diseases

Specialist in General Surgery | Gastrointestinal Endoscopy

Dr Marcin Olender is a specialist in general surgery with extensive clinical experience in the diagnosis and treatment of surgical and gastrointestinal conditions. At KCM Clinic, he focuses particularly on gastrointestinal endoscopy and provides patients with comprehensive diagnostic examinations of the upper and lower digestive tract.

His clinical practice combines surgical expertise with modern endoscopic diagnostic techniques, allowing patients to receive accurate assessment and appropriate recommendations based on their individual medical needs.

Areas of Expertise

Dr Olender specialises in:

• General surgery
• Gastrointestinal endoscopy
• Gastroscopy
• Colonoscopy
• Colonoscopy with polypectomy
• Diagnosis of diseases of the upper gastrointestinal tract
• Diagnosis of diseases of the lower gastrointestinal tract
• Endoscopic assessment of gastrointestinal symptoms
• Qualification for gastrointestinal endoscopic procedures
• Selected procedures supporting the treatment of obesity

At KCM Clinic, Dr Olender performs both gastroscopy and colonoscopy, including colonoscopy with removal of polyps when medically indicated.

Gastrointestinal Endoscopy

Gastrointestinal endoscopy is an important part of modern diagnosis and prevention of digestive system diseases.

During a gastroscopy, the oesophagus, stomach and duodenum are carefully examined. The procedure can help identify conditions such as inflammation, ulcers, bleeding and other abnormalities.

A colonoscopy allows examination of the large intestine and is an important tool in the diagnosis and prevention of colorectal cancer. When appropriate, polyps can be removed during the same procedure and subsequently sent for histopathological examination.

Dr Olender also performs endoscopic examinations as part of the diagnostic pathway for patients with gastrointestinal symptoms and conditions requiring further investigation.

A Patient-Centred Approach

Dr Olender places particular emphasis on patient safety, careful diagnosis and clear communication.

Before an examination, patients receive information about the procedure and preparation requirements. During the consultation, the patient's symptoms, medical history and individual risk factors are taken into consideration.

The goal is to make the diagnostic process as comfortable, safe and informative as possible while ensuring that patients understand the purpose and results of their examination.

Experience in Bariatric Care

Dr Olender is also a member of the multidisciplinary bariatric team at KCM Clinic. His work in this area includes gastrointestinal diagnostics and selected endoscopic procedures supporting the treatment of obesity, including the placement of a gastric balloon as part of an individually tailored weight-management programme.

Gastrointestinal endoscopy can play an important role in the assessment and preparation of patients undergoing bariatric treatment, helping physicians evaluate the condition of the digestive tract and identify potential medical considerations before treatment.

Your Visit at KCM Clinic

During your appointment, Dr Olender will discuss your symptoms, medical history and the reason for the examination. You will receive information about how to prepare for the procedure, what to expect during the examination and any necessary follow-up.

Our priority is to provide patients with professional medical care, accurate diagnostics and a comfortable experience throughout the entire diagnostic process.

Dr. Harald Rosen specializes in interventional endoscopy at Wiener Privatklinik. During gastroscopy with biopsy, he uses minimally invasive techniques to identify digestive disorders and gastrointestinal cancers.

• Expert in endoscopic resections – removes abnormal tissues without using large surgical incisions
• Consultant in gastroenterology and internal medicine at one of Austria's top private hospitals
• Uses ERCP to treat complex problems in the bile and pancreatic ducts
• Member of the European Society of Surgery (ESS)

Dr. Miquel Sans Cuffí is a gastroenterologist at Centro Médico Teknon in Barcelona. He is the author of over 150 publications and 500 conference presentations. Dr. Cuffí conducted research on inflammatory bowel diseases at Case Western Reserve University in Ohio. He treats complex conditions like Crohn's disease, ulcerative colitis, and Barrett's esophagus.

• Former member of the Scientific Committee for the European Crohn’s and Colitis Organisation.
• Served as coordinator for the European IBDChip research project.
• Member of the American Gastroenterological Association and the Spanish Association of Gastroenterology.
• Performs specialized procedures including stomach resection and laparoscopic anti-reflux surgery.

Dr. Vilius Kontenis is a gastroenterologist and endoscopist at Meliva Kardiolita Hospital in Vilnius. He is a member of the World Gastroenterology Organisation. Dr. Kontenis specializes in inflammatory bowel disease and non-invasive liver fibrosis assessment. He also treats digestive disorders, dysphagia, and food allergies.

• Performs gastroscopy with biopsy, colonoscopy, and transnasal endoscopy.
• Published a systematic meta-analysis on anti-TNF therapy discontinuation in IBD patients.
• Served as the editor of the medical journal Gastroenterologija.
• Practices at JCI-accredited Kardiolita Hospital, which treats 298,000 patients annually.

Dr. Tomas Jucaitis is a gastroenterologist and endoscopist at Meliva Kardiolita Hospital in Vilnius. He focuses on instrumental diagnostics, including gastrointestinal ultrasound and transnasal endoscopy. Dr. Jucaitis completed his medical training and residency at Vilnius University. He also completed clinical internships in the USA, Germany, and the Czech Republic.

• Served as a coordinator at the Lithuanian National Organ Transplantation Bureau.
• Performs colonoscopies, gastroscopies with biopsy, and complex ultrasound screenings.
• Practices at a JCI-accredited facility that treats 298,000 patients annually.
• Maintains expertise in internal medicine and gastroenterology since 1998.

Dr. Laura Masalaite is the Acting Head of the Organ Transplantation Coordination Centre at VUL Santaros Clinics. She also serves as an Associate Professor at Vilnius University. Dr. Masalaite is a licensed gastroenterologist and endoscopist. She conducts specialized research on liver transplantation and colorectal cancer screening.

• Completed liver transplantation training in Vienna and Warsaw.
• Specialize in endoscopic ultrasound and Zenker diverticulotomy.
• Published over 10 studies in journals like Cancers and Hepatology International.
• Works at Meliva Kardiolita Hospital, a JCI-accredited facility in Vilnius.

Professor Martin Schindl specializes in complex abdominal surgery at Wiener Privatklinik. Gasotroscopy with biopsy supports his work in treating gastric polyps and digestive tract disorders.

• Professor of Surgery at the Medical University of Vienna
• Specializes in oncologic abdominal surgery and visceral oncology
• Performs removal of gastric and duodenal polyps
• Senior Consultant at the Transplant Surgery Division
• Published in journals on surgical oncology and patient survival

Professor Schoppmann leads the Upper GI Surgery Unit at the Medical University of Vienna. He specializes in gastric cancer and Barrett’s esophagus diagnostics.

• Performs gastroscopy with biopsy to identify esophageal and gastric cancers
• Integrates molecular cancer research into clinical diagnostic practice
• Expert in identifying Barrett’s esophagus – a pre-cancerous change caused by acid reflux
• Consultant at Wiener Privatklinik and Professor of Surgery
• Member of the International Society for Diseases of the Esophagus