When Dr. Christopher Ma and a team of international gastroenterologists sat down to develop new clinical guidance, they faced a familiar problem: doctors around the world were using the same imaging tool in slightly different ways, and that inconsistency was hampering care for thousands of Crohn disease patients recovering from bowel surgery.
The stakes of this standardization are real for anyone who has undergone ileocolic resection—the surgical removal of diseased bowel segments that is often necessary to manage severe Crohn disease. After surgery, patients face a significant risk of disease recurrence, sometimes within months. Catching that recurrence early, when intervention is most effective, depends on doctors being able to reliably interpret the same imaging findings in the same way. For years, intestinal ultrasound had shown promise as a tool for detecting postoperative recurrence, but without consistent protocols, its diagnostic power remained underutilized.
Working through the RAND/UCLA appropriateness method—a structured process designed to build expert consensus—Ma and his multidisciplinary colleagues from around the world voted on 79 separate statements related to how intestinal ultrasound should be applied in this clinical setting. After two rounds of voting and ratification, 67 statements achieved consensus. The result, published in May 2026 in The Lancet Gastroenterology & Hepatology, now provides clear, evidence-based guidance on exactly which anatomical regions clinicians should examine during ultrasound assessment.
The recommendations specify that sonographers should evaluate the colonic segment immediately distal to the anastomosis—the junction where the bowel is reconnected—along with the neoterminal ileum, neoterminal ileal inlet, and the colonic and ileal blind side of the anastomosis. The guidance goes further, detailing what features clinicians should measure and assess: bowel wall thickness, bowel wall stratification and vascularity, mesenteric inflammatory fat and lymphadenopathy, luminal narrowing, and signs of complications including abscess, inflammatory mass, fistula, stricture formation, and prestenotic dilation.
Timing matters too. The consensus recommends waiting at least four weeks after surgery before performing intestinal ultrasound, avoiding the period when immediate postoperative changes and surgical healing could confound the interpretation of findings. This seemingly small detail ensures that doctors are actually detecting disease recurrence, not just normal postsurgical inflammation.
Ma and his colleagues frame this work as a bridge between clinical practice and research. "The guidance developed through this consensus aims to enhance consistency, diagnostic accuracy, and confidence in applying intestinal ultrasound to clinical practice and research settings," they write. For gastroenterologists managing Crohn disease patients globally, that consistency matters deeply. It means a patient in Calgary receives the same quality of standardized assessment as a patient in London or São Paulo. It means clinicians can interpret results with greater confidence, and research teams can compare findings across different centers and populations with real scientific rigor.
The work also opens a pathway for ultrasound to become a more central tool in postoperative surveillance. Unlike colonoscopy, which is invasive, or CT imaging, which exposes patients to radiation, ultrasound is noninvasive, reproducible, and radiation-free—a significant advantage for patients who may need multiple assessments over years of follow-up care.