Yutaka Tomizawa
Clinical Associate Professor
Division of Gastroenterology

Faculty Information

Dr. Tomizawa is a board certified gastroenterologist at UW Medicine's Harborview Medical Center and a Clinical Assistant Professor of Medicine at the University of Washington. He completed his formal GI training in Japan before moving to the U.S., with a focus on the endoscopic management of early gastrointestinal cancer. While in Japan, he had the privilege of working with some of the world leading expertise in advanced endoscopy and having trained with endoscopic submucosal dissection (ESD). He is one of a few gastroenterologists in the region who provides ESD. 
Dr.Tomizawa has served on the American Society for Gastrointestinal Endoscopy (ASGE) Committee, Editorial Review Boards of ASGE official journals (GIE and Video-GIE), and co-chaired sessions at the national conferences. Since he was recruited to UW, Dr.Tomizawa has been awarded by ASGE for Endoscopy Research Award (2020), GIE Best Reviewer Award (2019, 2021, 2022), and Video-GIE Best Reviewer Award (2021).
He performs other advanced endoscopic procedures including endoscopic ultrasound (EUS), endoscopic retrograde cholangiopancreatography (ERCP), radiofrequency ablation (RFA), endoluminal stenting, complex stricture remediation and small bowel enteroscopy. 

Board Certifications:

  • Gastroenterology, 2016, American Board of Internal Medicine
  • Internal Medicine, 2013, American Board of Internal Medicine
Education & Training: 
Fellowship in Interventional Endoscopy
University of Pennsylvania
Philadelphia, PA
Fellowship in Gastroenterology
University of Chicago Medical Center
Chicago, IL
Master of Science
University of Chicago
Chicago, IL
Residency in Internal Medicine
University of Pittsburgh Medical Center
Pittsburgh, PA
Internship in Internal Medicine
University of Pittsburgh Medical Center
Pittsburgh, PA
Medical Education
Tokyo Medical University
Tokyo, Japan
GIE Best Reviewer Award
Video-GIE Best Reviewer Award
GIE Best Reviewer Award
ASGE Endoscopy Research Award
GIE Best Reviewer Award
Research & Clinical Interests
Clinical Interests: 
  • Gastroenterology (Digestive)
  • Telehealth Services
GastroenterologyAvailable online 16 July 2021 PMID: 34280384 DOI: 10.1053/j.gastro.2021.07.017
Mise N, Tomizawa Y, Fujii A, Yamaguchi Y, Sugimoto T. A case of tubulointerstitial nephritis in IgG4-related systemic disease with markedly enlarged kidneys. Nephrology Dialysis Transplantation PLUS 2009;2(3):233-235 PMID: 25983998 [original work]
Kondo Y, Yoshida H, Tomizawa Y, Tateishi R, Shiina S, Tagawa K, Omata M.
regular hemodialysis for end-stage renal disease. AJR Am J Roentgenol 2009;193(4):964
-969 PMID: 19770317 [original work]
adenocarcinoma in Barrett’s esophagus. Curr Opin Gastroenterol 2009;25(4):358-365 PMID: 19461512 [review]
Tomizawa Y, Wang K. Endocytoscopy for esophageal adenocarcinoma. Gastrointest Endoscopy Clin N Am 2009;19(2):273-281 PMID: 19423024 [review]
Tomizawa Y, Wang K. Screening, Surveillance and Prevention for esophageal cancer. Gastroenterol Clin North Am 2009;38(1):59-73 PMID: 19327567 [review]
Tomizawa Y, Wang KK. Large refractory sporadic gastric fundic gland polyp with low- grade dysplasia. Clin Gastroenterol Hepatol 2010;8(11):e112-113 PMID: 20541629 [case report]
Tomizawa Y, Taniguchi M, Mori M. An unusual case of intraluminally growing esophageal tumor. Gastroenterology 2011;141(1):e10-11 PMID: 21640115 [case report]
Okoro NI, Tomizawa Y, Dunagan KT, Lutzke LS, Wang KK, Prasad GA. Safety of Prior
Endoscopic Mucosal Resection in Patients Receiving Radiofrequency Ablation of Barrett's Esophagus. Clin Gastroenterol Hepatol 2012;10(2):150-154 PMID: 22056303 [original work]
Tomizawa Y, Tian J. Photodynamic therapy for unresectable cholangiocarcinoma. Dig Dis Sci 2012;57(2):274-283 PMID: 22057285 [review]
Lymphoma mimicking Poorly Differentiated Gastric Adenocarcinoma. Case Rep Gastroenterol 2012;6(1):47-51 PMID: 22423238 [case report]
Tomizawa Y, Ocque R, Ohori NP. Orbital Metastasis as the Initial Presentation of Invasive Lobular Carcinoma of Breast. Intern Med 2012;51(12):1635-1638 PMID: 22728506 [case report]
Clarke B, Slivka A, Tomizawa Y, Sanders M, Papachristou GI, Whitcomb DC, Yadav D.
Endoscopic Therapy Is Effective for Patients With Chronic Pancreatitis. Clin Gastroenterol Hepatol. 2012;10(7):795-802 PMID: 22245964 [original work]
Tomizawa Y, Wu TT, Wang KK. Epithelial mesenchymal transition (EMT) and cancer stem cell (CSC) in esophageal adenocarcinoma in Barrett’s esophagus. Oncol Lett. 2012;3(5):1059-1063 PMID: 22783391 [original work]
Tomizawa Y, Garner K, Sohnen A. Lymphangioma of the small-bowel mesentery : a rare intra-abdominal tumor causing anemia. Clin Gastroenterol Hepatol 2013;11(8):e57 PMID: 23200978 [case report]
Dreifuss SE, Tomizawa Y, Farber NJ, Davison JM, Sohnen AE. Spruelike enteropathy associated with olmesartan: an unusual case of severe diarrhea. Case Rep Gastrointest Med 2013;2013:618071 PMID: 23573432 [case report]
Tomizawa Y, Iyer PG, WongKeeSong LM, Buttar NS, Lutzke LS, Wang KK. Safety of
Endoscopic Mucosal Resection for Barrett's Esophagus. Am J Gastroenterol 2013;108(9):1440-1447 PMID: 23857478 [original work]
Tomizawa Y, Yecies EB, Craig FE, Sohnen AE. Peritoneal Tuberculosis in an
Immunocompetent, Unknown Risk Patient. Case Rep Gastrointest Med 2013;2013:680763 PMID: 23878749 [case report]
Tomizawa Y, Sohnen AE. Spontaneous pneumomediastinum from extensive subcutaneous emphysema. Intern Med. 2013;52(19):2291 PMID: 24088772 [case report]
Tomizawa Y. Acute colonic pseudo-obstruction (Ogilvie’s syndrome) mimicking Pneumoperitoneum. Intern Med 2013;52(21):2477-8 PMID: 24190158 [case report]
Tomizawa Y, Iyer PG, Wongkeesong LM, Buttar NS, Lutzke LS, Wu TT, Wang KK. Assessment of the Diagnostic Performance and Interobserver Variability of Endocytoscopy in Barrett’s Esophagus: A Pilot Ex-Vivo Study. World J Gastroenterol 2013;19(46):8652-8 PMID: 24379583 [original work]
Tomizawa Y, Jose Di Giorgio, Ernesto Santos, Kevin M. McCluskey, Gelrud A. Combined Interventional radiology followed by endoscopic therapy as a single procedure for patients With failed initial endoscopic biliary access. Dig Dis Sci 2014;59(2):451-458 PMID: 24271117 [original work]
Tomizawa Y, Waxman I. Enhanced mucosal imaging and the esophagus--ready for prime time? Curr Gastroenterol Rep 2014;16(6):389 PMID: 24743954 [review]
Namasivayam V, Prasad GA, Lutzke LS, Dunagan KT, Borkenhagen LS, Okoro NI, Tomizawa Y, Buttar NS, Michel WL, Wang KK. The risk of endoscopic mucosal resection in the setting of clopidogrel use. ISRN Gastroenterol 2014;27:494-157 PMID: 24944824 [original work]
Tomizawa Y, Sakuraba A, Pekow J. Parastomal Variceal Bleeding Attributed to Obstructive Pathology Successfully Treated by Percutaneous Variceal Embolization. ACG Case Report Journal 2014;1(4):137-139 PMID: 26157881 [case report]
Tomizawa Y, Konda V. Confocal Laser Endomicroscopy - The Potential Role of In Vivo Characterization of Neoplasia in the Gastrointestinal Tract J Clin Exp Pahol 2014;4:181 [review]
Tomizawa Y, Zhao L, Yang LW. Nausea, Vomiting, and Weight Loss: Common Symptoms of an Uncommon Disease. Gastroenterology 2014;147(3):573-4 PMID: 25064543 [case report]
Tomizawa Y, Van Slambrouck C, Kavitt RT. A rare cause of diarrhea and weight loss. Gastroenterology 2015;148(7):1288-1289 PMID: 25936950 [case report]
Tomizawa Y. A Polypoid Lesion in the Stomach: Atypical Endoscopic Appearance and a Rare Cause. Am J Gastroenterol 2015;110(10):1395 PMID: 26465898 [case report]
Tomizawa Y, Zhao L. A Rare Cause of Diarrhea and Weight Loss. Am J Gastroenterol 2015;110(11);1534 PMID: 26618416 [case report]
Tomizawa Y, Alpert L, Siddiqui UD. Altered Bowel Movements - A Rare Rectal Lesion. Gastroenterology 2016;150(5):1092-3 PMID: 27020337 [case report]
Tomizawa Y, Konda VA, Coronel E, Chapman CG, Siddiqui UD. Efficacy, Durability and Safety of Complete Endoscopic Mucosal Resection of Barrett’s Esophagus: A Systematic Review and Meta-Analysis. J Clin Gastroenterol 2018;52(3)210-216 PMID: 28134635 [original work]
Tomizawa Y, Melek J, Komaki Y, Kavitt RT, Sakuraba A. Efficacy of Pharmacologic
Therapy for Eosinophilic Esophagitis: A Systematic Review and Network Meta-Analysis. J Clin Gastroenterol 2018;52(7):596-606 PMID: 28787360 [original work]
Tomizawa Y, Yu G, Kochman ML. Periduodenal Mass – A Rare Diagnosis Confirmed by Endoscopic Ultrasound (EUS) Guided Fine-Needle Aspiration (FNA). Gastroenterol 2017;153(6):1488-1489 PMID: 29104101 [case report]
Tomizawa Y, Tanaka A, Kitahara H, Sakuraba A, Uriel N, Jeevanandam V, Ota T. Preoperative Right-Sided Cardiac Congestion is Associated With Gastrointestinal Bleeding in Patients With Continuous Flow Left Ventricular Assist Devices. Dig Dis Sci. 2018;63:1518-1524 PMID: 29417325 [original work]
Tomizawa Y, Ginsberg GG. Clinical Outcome of Endoscopic Mucosal Resection (EMR) of Sporadic, Non-Ampullary Duodenal Adenoma (SNADA) : A ten-year retrospective. Gastrointest Endosc. 2018;87:1270-1278 PMID: 29317270 [original work]
Hanada Y, Choi AY, Hwang JH, Draganov PV, Khanna L, Sethi A, Bartel MJ, Goel N, Abe S, De Latour RA, Park K, Melis M, Newman E, Hatzaras I, Reddy SS, Farma JM, Liu X, Schlachterman A, Kresak J, Trapp G, Ansari N, Schrope B, Lee JY, Dhall D, Lo S, Jamil LH, Burch M, Gaddam S, Gong Y, Del Portillo A, Tomizawa Y, Truong CD, Brewer Gutierrez OI, Montgomery E, Johnston FM, Duncan M, Canto M, Ahuja N, Lennon AM, Ngamruengphong S.
Mahmud N, Tomizawa Y, Stashek K, Katona BW, Ginsberg GG, Metz DC. Endoscopic Resection of Duodenal Carcinoid Tumors: A Single-Center Comparison Between Simple Polypectomy and Endoscopic Mucosal Resection. Pancreas. 2019;48:60-65 PMID: 30451799 [original work]
Coronel E, Cazacu IM, Sakuraba A, Luzuriaga Chavez AA, Uberoi A, Geng Y, Tomizawa Y, Saftoiu A, Shin EJ, Taniguchi CM, Koong AC, Herman JM, Bhutani MS. EUS-guided fiducial placement for GI malignancies: a systematic review and meta-analysis. Gastrointest Endosc. 2019;89:659-670 PMID: 30445001 [original work]
Sakamoto T, Ramaraj R, Tomizawa Y, Cho H, Matsuda T, Saito Y. Clinical significance of colorectal polyp detection on colonoscopy insertion. United European Gastroenterol J. 2019;7(1):125-129 PMID: 30788124 [original work]
Baxi AC, Swanson PE, Tomizawa Y. An Unusual Abdominal Pain. Gastroenterol 2019;157(6):1490-1491 PMID: 30981789 [case report]
Sekiguchi M, Otake Y, Kakugawa Y, Matsumoto M, Tomizawa Y, Saito Y, Matsuda T. Incidence of Advanced Colorectal Neoplasia in Individuals With Untreated Diminutive Colorectal Adenomas Diagnosed by Magnifying Image-Enhanced Endoscopy. Am J Gastroenterol. 2019;114(6):964-973 PMID: 31082873 [original work]
Sakamoto T, Tomizawa Y, Cho H, Takamaru H, Sekiguchi M, Yamada M, Matsuda T, Murakami Y, Saito Y. Additional value of linked color imaging in colonoscopy: a retrospective study. Endosc Int Open. 2019;7(11):E1448-E1454 PMID: 31673617 [original work]
Yang D, Aihara H, Perbtani YB, Wang AY, Aadam AA, Tomizawa Y, Hwang JH, Zou B, Natov NS, Siegel A, Khoshknab MP, Khashab MA, Ngamruengphong S, Khara HS, Diehl DL, Maniere T, Andrawes S, Benias P, Kumta NA, Ramay F, Kim RE, Samarasena J, Chang K, Hashimoto R, Tharian B, Inamdar S, Lan G, Sethi A, Nosler MJ, Tabash A, Othman MO, Draganov PV. Safety and efficacy of endoscopic submucosal dissection for rectal neoplasia: a multicenter North American experience. Endosc Int Open. 2019 Dec;7(12):E1714-E1722 PMID: 31803823 [original work]
Sekiguchi M, Kakugawa Y, Nakamura K, Matsumoto M, Tomizawa Y, Murakami Y, Saito Y, Matsuda T. Family history of colorectal cancer and prevalence of advanced colorectal neoplasia in asymptomatic screened populations in different age groups. Gastrointest Endosc 2020;91(6)1361-1370 PMID: 32004550 [original work]
Hashimoto R, Inoue H, Shimamura Y, Sakuraba A, Tomizawa Y. POEM as salvage therapy in patients with achalasia refractory to endoscopic or surgical therapy is technically feasible and safe: A systematic review and meta-analysis. Dig Endosc 2020;32(7):1042-1049 PMID: 32012360 [original work]
Tomizawa Y, Friedland S, Hwang JH. Endoscopic submucosal dissection (ESD) for Barrett's esophagus (BE)-related early neoplasia after standard endoscopic management is feasible and safe. Endosc Int Open. 2020;8(4):E498-E505 PMID: 32258371 [original work]
Ngamruengphong S, Ferri L, Aihara H, Draganov PV, Yang DJ, Perbtani YB, Jue TL, Munroe CA, Boparai ES, Mehta NA, Bhatt A, Kumta NA, Othman MO, Mercado M, Javaid H, Aadam AA, Siegel A, James TW, Grimm IS, DeWitt JM, Novikov A, Schlachterman A, Kowalski T, Samarasena J, Hashimoto R, Chehade NEH, Lee J, Chang K, Su B, Ujiki MB, Mehta A, Sharaiha RZ, Carr-Locke DL, Chen A, Chen M, Chen YI, Khoshknab MP, Wang R, Kerdsirichairat T, Tomizawa Y, von Renteln D, Kumbhari V, Khashab MA, Bechara R, Karasik M, Patel NJ, Fukami N, Nishimura M, Hanada Y, Wong Kee Song LM, Laszkowska M, Wang AY, Hwang JH, Friedland S, Sethi A, Kalloo AN. Efficacy of Endoscopic Submucosal Dissection for Superficial Gastric Neoplasia in a Large Cohort in North America. Clin Gastroenterol Hepatol. 2020 Online ahead of print. PMID: 32565290 [original work]
Tomizawa Y, Mahmud N, Dasher K, Triggs JR, Saumoy M, Falk GW, Ginsberg GG. Type II achalasia is associated with a comparably favorable outcome following per oral endoscopic myotomy. Dis Esophagus. 2020. Online ahead of print. PMID: 33180122 [original work]