Profile image of Usama  Ahmed Ali, MD, PHD

Usama Ahmed Ali, MD, PHD


Colon Cancer
Colon and Rectal Surgery
Inflammatory Bowel Disease (IBD)
Pelvic Floor Disorders
Rectal Cancer
Rectal Prolapse


Dr Usama Ahmed Ali is a surgical associate/advanced clinical fellow in Colorectal Surgery. He completed his medical training at Utrecht University in the Netherlands in 2007. He worked on colorectal research as a PhD researcher and was a colorectal research fellow at the Cleveland Clinic in 2011. He then trained in general and colorectal surgery in the University Medical Center Utrecht and the St. Antonius Hospital in The Netherlands. He worked as a general and colorectal surgeon in Riverieland Ziekenhuis in Tiel until 2022. 

Dr Ahmed Ali has expertise in minimally invasive and open colorectal surgical procedures as well as in anorectal operations. This includes a wide spectrum of colorectal conditions including inflammatory bowel disease, colon and rectal cancer, diverticular disease and anorectal disorders.

Dr Ahmed Ali has a double PhD in medicine including one on surgical treatment of inflammatory bowel disease and has a Masters in Evidence-Based Medicine from Oxford University. He is a Member of Dutch Society for Surgery and Dutch Society for Gastro-intestinal Surgery (2021).

At New York-Presbyterian/Columbia University, Dr Ahmed Ali works collaboratively with Dr Pokala Ravi Kiran obtaining additional exposure to complex and reoperative colorectal surgery.


Ahmed Ali U, R.P. Kiran. Surgery for Crohn’s Disease: Upfront or Last-resort?  Gastroenterology Report . 2022 Nov 9;10.

Pronk AJM, Roelofs A, Flum DR, Bonjer HJ, Abu Hilal M, Dijkgraaf MGW, Besselink MG, Ahmed Ali1 U. Two decades of surgical randomized controlled trials: worldwide trends in volume and methodological quality. Under review.

Kempeneers MA, Issa Y, Verdonk RC, Bruno M, Fockens P, van Goor H, Alofs E, Bollen TL, Bouwense S, van Dalen ASHM, van Dieren S, van Dullemen HM, van Geenen EJ, Hoge C, van Hooft JE, Kager LM, Keulemans Y, Nooijen LE, Poley JW, Seerden TCJ, Tan A, Thijs W, Timmer R, Vleggaar F, Witteman B, Ahmed Ali U, Besselink MG, Boermeester MA, van Santvoort HC. Pain patterns in chronic pancreatitis: a nationwide longitudinal cohort study. Gut. 2021 Sep;70(9):1724-1733.

Kempeneers MA, Issa Y, Ahmed Ali U, Baron RD, Besselink MG, Büchler M, Erkan M, Fernandez-Del Castillo C, Isaji S, Izbicki J, Kleeff J, Laukkarinen J, Sheel ARG, Shimosegawa T, Whitcomb DC, Windsor J, Miao Y, Neoptolemos J, Boermeester MA; Working group for the International (IAP – APA – JPS – EPC) Consensus Guidelines for Chronic Pancreatitis. International consensus guidelines for surgery and the timing of intervention in chronic pancreatitis. Pancreatology. 2020 Mar;20(2):149-157. 

Kempeneers MA, Ahmed Ali U, Issa Y, van Goor H, Drenth JPH, van Dullemen HM, van Hooft JE, Poen AC, van Veldhuisen SL, Besselink MG, van Santvoort HC, Bruno MJ, Boermeester MA. Natural Course and Treatment of Pancreatic Exocrine Insufficiency in a Nationwide Cohort of Chronic Pancreatitis. Pancreas. 2020 Feb;49(2):242-248. 

Issa Y, Kempeneers MA, Bruno MJ, Fockens P, Poley JW, Ahmed Ali U, Bollen TL, Busch OR, Dejong CH, van Duijvendijk P, van Dullemen HM, van Eijck CH, van Goor H, Hadithi M, Haveman JW, Keulemans Y, Nieuwenhuijs VB, Poen AC, Rauws EA, Tan AC, Thijs W, Timmer R, Witteman BJ, Besselink MG, van Hooft JE, van Santvoort HC, Dijkgraaf MG, Boermeester MA. Effect of Early Surgery vs Endoscopy-First Approach on Pain in Patients With Chronic Pancreatitis: The ESCAPE Randomized Clinical Trial. JAMA. 2020 Jan 21;323(3):237-247.

Van Dalen AHM, Ahmed Ali U, Murray AC, Kiran RP. Optimizing Patient Selection for Laparoscopic and Open Colorectal Cancer Resections: A National Surgical Quality Improvement Program–Matched Analysis. The American Surgeon, Feb 2019;1;85(2):206-213. 

Schepers NJ, Bakker OJ, Besselink MG, Ahmed Ali U, Bollen TL, Gooszen HG, van Santvoort HC, Bruno MJ. Impact of characteristics of organ failure and infected necrosis on mortality in necrotising pancreatitis. Gut 2019 Jun;68(6):1044-1051. 

Ahmed Ali U, Ten Hove JR, Reiber BM, van der Sluis PC, Besselink MG. Sample size of surgical randomized controlled trials: a lack of improvement over time. J Surg Res. 2018 Aug;228:1-7. 

Issa Y, van Santvoort HC, van Dieren S, Besselink MG, Boermeester MA, Ahmed Ali U. Diagnosing Chronic Pancreatitis: Comparison and Evaluation of Different Diagnostic Tools. Pancreas. 2017 Oct;46(9):1158-1164.

Rijkers AP, Bakker OJ, Ahmed Ali U, Hagenaars JCJP, van Santvoort HC, Besselink MG, Bollen TL, van Eijck CH. Risk of Pancreatic Cancer After a Primary Episode of Acute Pancreatitis. Pancreas. 2017 Sep;46(8):1018-1022.

Ahmed Ali U, Beata RM, ten Hove JR, MD; van der Sluis PC, Gooszen HG, Boermeester MA, Besselink GH, Journal impact factor and methodological quality of surgical randomized controlled trials: an empirical study. Langenbeck's Archives of Surgery. 2017 Nov;402(7):1015-1022.

Frima H, Hulsmans MH, Houwert RM, Ahmed Ali U, Verleisdonk EJ, Sommer C, van Heijl M. End cap versus no end cap in intramedullary nailing for displaced midshaft clavicle fractures: influence on implant-related irritation. Eur J Trauma Emerg Surg. 2018 Feb;44(1):119-124.

van Rosmalen BV, Alldinger I, Cieslak KP, Wennink R, Clarke M, Ahmed Ali U, Besselink MG. Worldwide trends in volume and quality of published protocols of randomized controlled trials. PLoS One. 2017 Mar 15;12(3).

Broeders JA, Ahmed Ali U, Molyneux AJ, Poncyljusz W, Raymond J, White PM, Steinfort B. Bioactive versus bare platinum coils for the endovascular treatment of intracranial aneurysms: systematic review and meta-analysis of randomized clinical trials. J Neurointerv Surg. 2016 Sep;8(9):898-908.

Broeders JA, Ahmed Ali U, Fischer G. Systematic review and meta-analysis of randomized clinical trials (RCTs) comparing topical calcineurin inhibitors with topical corticosteroids for atopic dermatitis: A 15-year experience. J Am Acad Dermatol. 2016 Aug;75(2):410-419.

Houwert RM, Smeeing DP, Ahmed Ali U, Hietbrink F, Kruyt MC, van der Meijden OA. Plate fixation or intramedullary fixation for midshaft clavicle fractures: a systematic review and meta-analysis of randomized controlled trials and observational studies. J Shoulder Elbow Surg. 2016 Jul;25(7):1195-203.

Ahmed Ali U, Issa Y, Hagenaars JC, Bakker OJ, van Goor H, Nieuwenhuijs VB, Bollen TL, van Ramshorst B, Witteman BJ, Brink MA, Schaapherder AF, Dejong CH, Spanier BW, Heisterkamp J, van der Harst E, van Eijck CH, Besselink MG, Gooszen HG, van Santvoort HC, Boermeester MA; Dutch Pancreatitis Study Group. Risk of Recurrent Pancreatitis and Progression to Chronic Pancreatitis After a First Episode of Acute Pancreatitis. Clin Gastroenterol Hepatol. 2016 May;14(5):738-46.

Hollemans RA, Bollen TL, van Brunschot S, Bakker OJ, Ahmed Ali U, van Goor H, Boermeester MA, Gooszen HG, Besselink MG, van Santvoort HC; Dutch Pancreatitis Study Group. Predicting Success of Catheter Drainage in Infected Necrotizing Pancreatitis. Ann Surg. 2016 Apr;263(4):787-92.

Ahmed Ali U, Issa Y, van Goor H, van Eijck CH, Nieuwenhuijs VB, Keulemans Y, Fockens P, Busch OR, Drenth JP, Dejong CH, van Dullemen HM, van Hooft JE, Siersema PD, Spanier BW, Poley JW, Poen AC, Timmer R, Seerden T, Tan AC, Thijs WJ, Witteman BJ, Romkens TE, Roeterdink AJ, Gooszen HG, van Santvoort HC, Bruno MJ, Boermeester MA; Dutch Pancreatitis Study Group. Dutch Chronic Pancreatitis Registry (CARE): design and rationale of a nationwide prospective evaluation and follow-up. Pancreatology. 2015 Jan-Feb;15(1):46-52.

Bakker OJ, van Brunschot S, van Santvoort HC, Besselink MG, Bollen TL, Boermeester MA, Dejong CH, van Goor H, Bosscha K, Ahmed Ali U, Bouwense S, et al.; Dutch Pancreatitis Study Group. Early versus on-demand nasoenteric tube feeding in acute pancreatitis. N Engl J Med. 2014 Nov 20;371(21):1983-93.

Scoglio D, Ahmed Ali U, Fichera A. Surgical treatment of ulcerative colitis: ileorectal vs ileal pouch-anal anastomosis. World J Gastroenterol. 2014 Oct 7;20(37):13211-8.

Ahmed Ali U, Dunne T, Gurland B, Vogel JD, Kiran RP. Actual versus estimated length of stay after colorectal surgery - which factors influence a deviation? The American Journal of Surgery. 2014 Oct;208(4):663-9.

Ahmed Ali U, Jens S, Busch ORC, Keus F, van Goor H, Gooszen HG, Boermeester MA. Antioxidants for pain in chronic pancreatitis. Cochrane Database Syst Rev. 2014 Aug 21;(8):CD008945.

Ahmed Ali U, Boermeester MA. Beoordelen van bewijs voor nieuwe behandelingen. Ned Tijdschr Geneeskd. 2014;158:A7281.

Ahmed Ali U, Martin ST, Rao AD, Kiran RP. Impact of preoperative immunosuppressive agents on postoperative outcomes in Crohn's disease. Dis Colon Rectum. 2014 May;57(5):663-74. 

Bakker OJ, van Santvoort H, Besselink MG, Boermeester MA, van Eijck C, Dejong K, van Goor H, Hofker S, Ahmed Ali U, Gooszen HG, Bollen TL; Dutch Pancreatitis Study Group. Extrapancreatic necrosis without pancreatic parenchymal necrosis: a separate entity in necrotising pancreatitis? Gut. 2013 Oct;62(10):1475-80.

Issa Y, Ahmed Ali U, Bouwense SA, van Santvoort HC, van Goor H. Preoperative Opioid Use And The Outcome Of Thoracoscopic Splanchnicectomy In Chronic Pancreatitis: A Systematic Review. Surgical Endoscopy. 2014 Feb;28(2):405-12.

Bouwense SA, Ahmed Ali U, ten Broek R, Issa Y, van Eijck CH, Wilder-Smith OH, van Goor H. Pain outcome after pancreatic surgery for pain of chronic pancreatitis: Relation to altered central pain processing. British Journal of Surgery. 2013 Dec;100(13):1797-804.

Ahmed Ali U, van der Sluis PC, Issa Y, AbouHabaga B, Gooszen HG, Flum DR, Algra A, Besselink MG. Trends in worldwide volume and methodological quality of surgical randomized controlled trials. Annals of Surgery. 2013 Aug; 258(2):199-207.

Besselink MG, Ahmed Ali U. Nederland wereldwijd koploper in kwaliteit van chirurgische RCTs. Nederlands Tijdschrift voor Heelkunde. 2003 Jul;22(4):10-1.

Ahmed Ali U, Vogel JD. Safety of Surgical Resident Training. Advances in Surgery (Book Chapter). 2013;47:45-57.

Kiran RP, Ahmed Ali U, Nisar PJ, Khoury W, Gu J, Shen B, Remzi FH,  Hammel JP, Lavery IC, Fazio VW, Goldblum JR. Risk and Location of Cancer in Patients with Preoperative Colitis-Associated Dysplasia Undergoing Proctocolectomy. Annals of Surgery. 2014 Feb;259(2):302-9.

Ahmed Ali U, Issa Y, Bruno MJ, van Goor H, van Santvoort H, Busch ORC, Dejong CHC, Nieuwenhuijs VB, van Eijck CH, van Dullemen HM, Fockens P, Siersema PD, Gouma DJ, MA Boermeester, et al. Early Surgery versus Optimal Current Step-up Practice for Chronic Pancreatitis (ESCAPE): design and rationale of a randomized trial. BMC Gastroenterol. 2013 Mar 18;13(1):49. 

Broeders JA, Roks DJ, Ahmed Ali U, Watson DI, Baigrie RJ, Cao Z, Hartmann J, Maddern GJ. Laparoscopic Anterior 180-Degree Versus Nissen Fundoplication for Gastroesophageal Reflux Disease Systematic Review and Meta-Analysis of Randomized Clinical Trials. Ann Surg. 2013 May;257(5):850-9.

Shapiro R, Ahmed Ali U, Lavery IC, Kiran RP. Endorectal ultrasound does not reliably identify patients with uT3 rectal cancer who can avoid neoadjuvant chemoradiotherapy. Int J Colorectal Dis. 2013 Feb; 28(7):993-1000. 

Ahmed Ali U, Nieuwenhuijs VB, van Eijck CH, Gooszen HG, van Dam RM, Busch OR, Dijkgraaf MG, Mauritz FA, Jens S, Mast J, van Goor H, Boermeester MA; Dutch Pancreatitis Study Group. Clinical outcome in relation to timing of surgery in chronic pancreatitis: a nomogram to predict pain relief. Arch Surg. 2012 Oct;147(10):925-32. 

Kiran RP, Ahmed Ali U, Coffey JC, Vogel JD, Pokala N, Fazio VW. Impact of Resident Participation in Surgical Operations on Postoperative Outcomes: National Surgical Quality Improvement Program. Ann Surg. 2012 Sep;256(3):469-75. 

Ahmed Ali U, Shen B, Remzi FH, Kiran RP. The Management of Anastomotic Pouch Sinus After IPAA. Dis Colon Rectum. 2012 May;55(5):541-8. 

van Esch AA, Ahmed Ali U, van Goor H, Bruno MJ, Drenth JPH. Wide variation in diagnostic and therapeutic strategies in chronic pancreatitis: A Dutch national survey. Journal of the Pancreas. 2012 Jul 10;13(4):394-401.

de Zeeuw S, Ahmed Ali U, Donders RA, Hueting WE, Keus F, van Laarhoven CJ. Update of complications and functional outcome of the ileo-pouch anal anastomosis: overview of evidence and meta-analysis of 96 observational studies. Int J Colorectal Dis. 2012 Apr;27(4):553. 

Ahmed Ali U, Bruno MJ, Issa Y, Gooszen HG, Fockens P, Boermeester MA; Pancreatitis Werkgroep Nederland. [Better pain management in chronic pancreatitis through early surgery?]. Ned Tijdschr Geneeskd. 2012;156(5):A4469.

Ahmed Ali U, Pahlplatz JM, Nealon WH, van Goor H, Gooszen HG, Boermeester MA. Endoscopic or surgical intervention for painful obstructive chronic pancreatitis. Cochrane Database Syst Rev. 2012 Jan 18;1:CD007884.

de Zeeuw S, Ahmed Ali U, van der Kolk MB, van Laarhoven KC. Ileal pouch anal anastomosis with close rectal dissection using automated vessel sealers forulcerative colitis: a promising alternative. Dig Surg. 2011;28(5-6):345-51. 

van Santvoort HC, Bakker OJ, Bollen TL, Besselink MG, Ahmed Ali U, SchrijverAM, Boermeester MA, et al; Dutch Pancreatitis Study Group. A conservative and minimally invasive approach to necrotizing pancreatitis improves outcome. Gastroenterology. 2011 Oct;141(4):1254-63. 

Broeders JA, Roks DJ, Ahmed Ali U, Draaisma WA, Smout AJ, Hazebroek EJ. Laparoscopic anterior versus posterior fundoplication for gastroesophageal reflux disease: systematic review and meta-analysis of randomized clinical trials. Ann Surg. 2011 Jul;254(1):39-47. 

Bakker OJ, van Santvoort HC, van Brunschot S, Ahmed Ali U, Besselink MG,Boermeester MA, et al; Dutch Pancreatitis Study Group. Pancreatitis, very early compared with normal start of enteral feeding (PYTHON trial): design and rationale of a randomised controlled multicenter trial. Trials. 2011 Mar 10;12:73. 

Broeders JA, Mauritz FA, Ahmed Ali U, Draaisma WA, Ruurda JP, Gooszen HG,Smout AJ, Broeders IA, Hazebroek EJ. Systematic review and meta-analysis oflaparoscopic Nissen (posterior total) versus Toupet (posterior partial)fundoplication for gastro-oesophageal reflux disease. Br J Surg. 2010Sep;97(9):1318-30. 

Besselink MG, van Santvoort HC, Renooij W, de Smet MB, Boermeester MA, FischerK, Timmerman HM, Ahmed Ali U, Cirkel GA, et al; Dutch Acute Pancreatitis Study Group. Intestinal barrier dysfunction in a randomized trial of a specific probiotic composition in acute pancreatitis. Ann Surg. 2009 Nov;250(5):712-9.

Ahmed Ali U, Keus F, Heikens JT, Bemelman WA, Berdah SV, Gooszen HG, vanLaarhoven CJ. Open versus laparoscopic (assisted) ileo pouch anal anastomosis for ulcerative colitis and familial adenomatous polyposis. Cochrane Database Syst Rev. 2009 Jan 21;(1):CD006267.

Keus F, Ahmed Ali U, Noordergraaf GJ, Roukema JA, Gooszen HG, van LaarhovenCJ. Laparoscopic vs. small incision cholecystectomy: Implications for pulmonary function and pain. A randomized clinical trial. Acta Anaesthesiol Scand. 2008 Mar;52(3):363-73.