Gastroenterologist Saowanee Ngamruengphong specializes in the endoscopic diagnosis and management of gastrointestinal malignancies, premalignant and malignant lesions in the gastrointestinal tract (e.g., early gastric cancer, Barrett's esophagus-associated neoplasia), esophageal cancer, colon polyps or early colorectal cancer, and pancreatic and biliary disease. Dr. Ngamruengphong earned a medical degree from Chulalongkorn University and completed residency training at the Texas Tech University Health Sciences Center. She undertook fellowship training in gastroenterology at the Mayo School of Graduate Medical Education and further fellowship training in therapeutic endoscopy at The Johns Hopkins Hospital. Her research interests include endoscopic resection and the management of precancerous or cancerous gastrointestinal lesions. Dr. Ngamruengphong is a member of several professional organizations, including the Thai Medical Council, the American College of Gastroenterology and the American Gastroenterological Association. Videos Endoscopic Submucosal Dissection (ESD) — Eileen’s Story Recent News Articles and Media Coverage A Rare, Stomach-Saving Endoscopic Procedure, Inside Tract (Spring 2021) Case Presentation: ESD-TAMIS, Inside Tract (Spring 2019) Innovative Approaches to Colorectal Surgery Benefit Patients, Surgery (Winter 2019) For Colorectal Polyps: Early Detection and Minimally Invasive Endoscopic Resection, Inside Tract (Winter, 2019) The Cutting Edge of Endoscopic Resection, Inside Tract (Spring, 2017) Stomach Cancer: Know Your Risks & Treatment Options, Johns Hopkins Surgery (4/26/2017). Dr. Ngamruengphong is rated as an Advanced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. Her top areas of expertise are Achalasia, Pancreatic Pseudocyst, Stomach Cancer, Endoscopy, and Gastric Bypass.

Steven Epstein is a Gastroenterologist in Baltimore, Maryland. Dr. Epstein is rated as a Distinguished provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Familial Adenomatous Polyposis, Attenuated Familial Adenomatous Polyposis, Cronkhite-Canada Disease, Gastrectomy, and Colonoscopy.

Dr. John Migaly is a distinguished colorectal surgeon and Chief of the Division of Colorectal Surgery/Ravitch Division at Johns Hopkins Medicine. He specializes in the treatment of colorectal cancer, inflammatory bowel disease, and other benign and complex colorectal conditions. Dr. Migaly is committed to providing advanced, patient-centered care, often using minimally invasive techniques including laparoscopic and robotic surgery, to help reduce recovery time and improve outcomes. Dr. Migaly comes to Johns Hopkins Medicine from the Duke University School of Medicine, serving from 2008-2024 on the surgery faculty treating patients primarily through the Duke Cancer Institute. He was elevated to Program Director of the General Surgery Residency in 2012, and subsequently served as Vice Chair of Education until 2024. His work was critical to the success of the undergraduate, graduate, and continuing medical education missions at Duke Surgery. Dr. Migaly earned his B.A. in Biochemistry from New York University and his medical degree from the New York University School of Medicine. He completed surgical residency and a research fellowship at Temple University Health Sciences Center, and colorectal surgery fellowship at Cleveland Clinic Florida. Dr. Migaly’s career has been marked not only by a complex and high-volume clinical colon and rectal surgery practice, but also a commitment to research and education, supported by greater than 200 publications, book chapters, and presentations. His research is centered around improving practice patterns and outcomes in colorectal cancer care and recovery. His leadership and dedication to advancing the field of colorectal surgery is evident through his service on committees that shape how colorectal care is delivered nationally, via his past and present service on the Program Committee, the Clinical Practice Guidelines Committee and the Diversity and Inclusion Committee of the American Society of Colon and Rectal Surgeons. Videos John Migaly, M.D.Chief of Colorectal Surgery"". Dr. Migaly is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Familial Colorectal Cancer, Gastroesophageal Junction Cancer, Anal Cancer, Colostomy, and Ileostomy.

Dr. Wikrom Karnsakul is an associate professor of pediatrics at the Johns Hopkins University School of Medicine. His clinical interests are in the care of pediatric liver diseases, and general gastrointestinal diseases. Dr. Karnsakul received his medical degree in 1992 from Faculty of Medicine, Siriraj Medical Center, Mahidol University School of Medicine in Bangkok, Thailand. He completed his residency in pediatrics at Advocate Hope Children's Hospital in 1998 and did a fellowship in pediatric gastroenterology, hepatology and nutrition at Texas Children's Hospital, Baylor College of Medicine in Houston, Texas. He completed his postdoctoral research training at USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine. He joined the faculty at Johns Hopkins in 2008. His research interests center on the understanding and treatment of chronic liver disease, ascites, cholestasis, viral hepatitis especially hepatitis C and hepatitis E, and Cystic Fibrosis Related Liver Disease. Dr. Karnsakul is also involved in NIH-funded multicenter research studies including the Cholestatic Liver Disease Consortium and Cystic Fibrosis Related Liver Disease Project. Dr. Karnsakul is currently a Fellow of the American Association for the Study of Liver Diseases (FAASLD). Dr. Karnsakul is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Alagille Syndrome, Cholestasis, Hepatitis E, Liver Transplant, and Endoscopy.

Gastroenterologist Mouen Khashab specializes in therapeutic endoscopy, and he oversees this group of practitioners across the Johns Hopkins enterprise. Nationally and internationally known in the field of interventional endoscopy, Dr. Khashab has contributed immensely to the field’s advancement as a minimally invasive means to treat gastrointestinal and pancreaticobiliary disorders. Dr. Khashab earned his medical degree from the American University of Beirut Faculty of Medicine, and subsequently completed a residency in internal medicine and a fellowship in gastroenterology at Indiana University. He then completed a two-year fellowship at The Johns Hopkins Hospital before joining the faculty in 2011. A busy researcher, Dr. Khashab has published more than 600 papers in peer-reviewed journals. In 2013, he described the procedure called gastric peroral endoscopic myotomy (known as G-POEM) and was able to disseminate and teach it all over the world. Other procedures that he expanded include peroral endoscopic myotomy (POEM), peroral endoscopic myotomy with fundoplication (POEM-F), Zenker’s peroral endoscopic myotomy (Z-POEM) and full thickness resection. In 2022, he received the Master Endoscopist Award from the American Society for Gastrointestinal Endoscopy (ASGE) for his numerous contributions to the field. His procedural expertise includes endoscopic retrograde cholangiopancreatography (ERCP), endoscopic ultrasound (EUS), interventional EUS, submucosal endoscopy, POEM/achalasia, endoscopic mucosal resection, endoscopic submucosal dissection, luminal stenting, large polyp resection and Barrett’s therapy, among others. Dr. Khashab is involved with multiple gastrointestinal societies and has served on many committees, including the ASGE Standards of Practice Committee, which is in charge of formulating guidelines for the practice of endoscopy. He has also served as an associate editor for the journal Endoscopy, a premier journal in the field. Khashab is a highly sought-after speaker at national and international conferences, and he has participated in multiple live endoscopy conferences. Outside of academic medicine, Dr. Khashab is an entrepreneur. His major interest is in new technology and medical devices, and his goal is to disrupt the field by introducing technology that makes endoscopic procedures safer, easier, efficient and more scalable. Dr. Khashab is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Achalasia, Pancreatic Pseudocyst, Bile Duct Obstruction, Endoscopy, and Gastric Bypass.

Francis Giardiello is a Gastroenterologist in Baltimore, Maryland. Dr. Giardiello is rated as a Distinguished provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Familial Adenomatous Polyposis, Juvenile Polyposis Syndrome, Attenuated Familial Adenomatous Polyposis, Colonoscopy, and Endoscopy.

Colleen Leavitt, M.D., practices internal medicine and pediatrics at Johns Hopkins Community Physicians. She received her medical degree and completed her residency in medicine & pediatrics at Loyola University School of Medicine. Dr. Leavitt is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. Her top areas of expertise are Type 2 Diabetes (T2D), Maturity Onset Diabetes of the Young, Hypertension, and Glucocorticoid-Remediable Aldosteronism.

Joseph Lin is a Gastroenterologist in Rosedale, Maryland. Dr. Lin is rated as a Distinguished provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Attenuated Familial Adenomatous Polyposis, Juvenile Polyposis Syndrome, Cronkhite-Canada Disease, and Lactose Intolerance.

Dr. Onwueme graduated with Distinction from Yale University with dual BSc/MSc degrees in chemistry and received MD and PhD degrees from Weill Cornell Medical College. He completed his Internal Medicine residency at Brigham and Women’s Hospital (Clinical Fellow Harvard Medical School) and his Gastroenterology fellowship at Johns Hopkins University School of Medicine. He is currently the Director of clinical trials at Woodholme Gastroenterology and has an ardent interest in the role of microbial metabolites in gut diseases. Dr. Onwueme prizes commitment to quality and compassionate patient care to which he devotes his practice. He has expert knowledge in gut microbiology and a special interest in diarrheal diseases, disordered gut motility, autoimmune and inflammatory bowel disease. Dr. Onwueme is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Gastric Dysmotility, Diverticular Disease, Diarrhea, Endoscopy, and Gastrectomy.

April Tignor is a Gastroenterologist in Glen Burnie, Maryland. Dr. Tignor is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. Her top areas of expertise are Hemorrhoids, Indigestion, Gastritis, Endoscopy, and Gastrectomy.

Anthony Kalloo is a professor of medicine with special interests in natural orifice translumenal endoscopic surgery, therapeutic endoscopy and sphincter of Oddi dysfunction. After receiving his medical degree at the University of the West Indies Medical School, Dr. Kalloo interned at Port of Spain General Hospital in Trinidad and performed his internal medicine residency at Howard University Hospital in Washington, D.C., where he was also chief resident. He completed fellowship training at the combined Georgetown University, Veterans Affairs Medical Center and National Institutes of Health program. Dr. Kalloo was an instructor of medicine at Georgetown University prior to joining the Johns Hopkins faculty in 1988. He was director of the Johns Hopkins Division of Gastroenterology and Hepatology from 2005–2020, and was an associate editor of Gastrointestinal Endoscopy. In 2009, Dr. Kalloo was recognized by the American Society for Gastrointestinal Endoscopy as the Distinguished Educator of the Year. In 2014, he received the Endoscopy Award from the German Society for Endoscopy for outstanding research and contribution in the field of endoscopy. In 2015, he received the BJ Vakil Oration from the Society of Gastrointestinal Endoscopy of India, which is bestowed on an international expert for his contribution to the field of gastrointestinal endoscopy. He has authored over 200 peer-reviewed publications and has more than 100 patents, including the use of botulinum toxin in the gastrointestinal tract, endoscopic cryotherapy and the winged biliary/pancreatic stent, as well as others related to natural orifice surgery. He is the pioneer of natural orifice translumenal endoscopic surgery, a technique that will enable abdominal surgery without the use of incisions. In 2015, he became a member of the inaugural chapter of the National Academy of Inventors at The Johns Hopkins University. This group represents the top 3% of all faculty inventors since 1969, and the top 1.5% of active Johns Hopkins faculty. Dr. Kalloo is a past panel chair for gastroenterology and urology devices with the United States Food and Drug Administration. He aims to advance the understanding, diagnosis, treatment and prevention of gastrointestinal and liver disease through patient care, education and research. Dr. Kalloo is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Hereditary Pancreatitis, Acute Pancreatitis, Achalasia, Endoscopy, and Gastrectomy.

Sergey Kantsevoy is a Gastroenterologist in Baltimore, Maryland. Dr. Kantsevoy is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Familial Adenomatous Polyposis, Turcot Syndrome, Gardner Syndrome, Endoscopy, and Colonoscopy. Dr. Kantsevoy is currently accepting new patients.

Charles Howell is a Gastroenterologist in Baltimore, Maryland. Dr. Howell is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Hepatitis C, Hepatitis, Familial Colorectal Cancer, Colonoscopy, and Endoscopy.

Bruce Greenwald is a Gastroenterologist in Baltimore, Maryland. Dr. Greenwald is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Barrett Esophagus, Esophageal Cancer, Benign Esophageal Stricture, Endoscopy, and Colonoscopy.

Peter Darwin is a Gastroenterologist in Baltimore, Maryland. Dr. Darwin is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Cholestasis, Bile Duct Obstruction, Bile Duct Stricture, Endoscopy, and Pancreatectomy.

David Nasrallah is a General Surgeon in Baltimore, Maryland. Dr. Nasrallah is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Breast Cancer, Hernia, Acrospiroma, Juvenile Angiofibroma, and Hernia Surgery. Dr. Nasrallah is currently accepting new patients.

Allen Friedman is a primary care provider, practicing in Internal Medicine in Baltimore, Maryland. Dr. Friedman is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Leukoplakia, Type 2 Diabetes (T2D), Erythroplakia, and Maturity Onset Diabetes of the Young.

George Apostolides is a Colorectal Surgeon in Towson, Maryland. Dr. Apostolides is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Bowel Incontinence, Rectal Prolapse, Encopresis, Ileostomy, and Hernia Surgery.

Mohammad Rahnama is a primary care provider, practicing in Internal Medicine in Parkville, Maryland. Dr. Rahnama is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are High Cholesterol, Familial Combined Hyperlipidemia, Xanthoma, and Cirrhosis.

Edward Wolf is a Gastroenterologist in Baltimore, Maryland. Dr. Wolf is rated as an Experienced provider by MediFind in the treatment of Juvenile Polyposis Syndrome. His top areas of expertise are Diverticular Disease, Gastroesophageal Reflux Disease (GERD), Barrett Esophagus, Colonoscopy, and Gastrectomy.