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Background: While standard clinical magnetic resonance (MR) enterography can detect inflammatory bowel disease, it is of limited value in deciding between medical versus surgical treatment. Alternatively, intestinal MR elastography has the potential to contribute additional information to therapeutic decision-making; however, the influence of bowel distension by oral contrast agent on viscoelastic tissue properties remains elusive. Therefore, we aimed to investigate the influence of oral contrast agent-induced bowel distension on the viscoelastic properties of the terminal ileum in healthy volunteers. Methods: In this prospective pilot study, 20 healthy volunteers (33.2±8.2 years; 10 men, 10 women) underwent multifrequency MR elastography using a single-shot spin-echo echo planar imaging sequence at 1.5 Tesla and drive frequencies of 40, 50, 60 and 70 Hz. Maps of shear wave speed (c in ms-1) and loss angle (φ in rad), representing stiffness and viscous properties, respectively, were generated using tomoelastography data processing. The volunteers were scanned before and after ingestion of 1,000 mL of 2% mannitol solution as oral contrast agent. Results: There was no significant difference in terminal ileum biomechanical properties before vs. after ingestion of an oral contrast agent (mean c: 1.47±0.24 vs. 1.40±0.25 ms-1 with P=0.37; mean φ: 0.70±0.12 rad vs. 0.68±0.12 rad with P=0.61). Moreover, there was no statistically significant correlation between MR elastography parameters before and after the ingestion of oral contrast (c: r=0.22, P=0.36; φ: r=0.24, P=0.30). Conclusions: The results of this study suggest that bowel distension for intestinal MR elastography has no systematic effect on the biomechanical tissue properties of the terminal ileum determined by MR elastography. Therefore, future study protocols appear feasible with or without oral contrast agents.

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The luminal surface of the intestinal epithelium is protected by a vital mucus layer, which is essential for lubrication, hydration, and fostering symbiotic bacterial relationships. Replicating and studying this complex mucus structure in vitro presents considerable challenges. To address this, we developed a hydrogel-integrated millifluidic tissue chamber capable of applying precise apical shear stress to intestinal models cultured on flat or 3D structured hydrogel scaffolds with adjustable stiffness. The chamber is designed to accommodate nine hydrogel scaffolds, 3D-printed as flat disks with a storage modulus matching the physiological range of intestinal tissue stiffness (~3.7 kPa) from bioactive decellularized and methacrylated small intestinal submucosa (dSIS-MA). Computational fluid dynamics simulations were conducted to confirm a laminar flow profile for both flat and 3D villi-comprising scaffolds in the physiologically relevant regime. The system was initially validated with HT29-MTX seeded hydrogel scaffolds, demonstrating accelerated differentiation, increased mucus production, and enhanced 3D organization under shear stress. These characteristic intestinal tissue features are essential for advanced in vitro models as they critically contribute to a functional barrier. Subsequently, the chamber was challenged with human intestinal stem cells (ISCs) from the terminal ileum. Our findings indicate that biomimicking hydrogel scaffolds, in combination with physiological shear stress, promote multi-lineage differentiation, as evidenced by a gene and protein expression analysis of basic markers and the 3D structural organization of ISCs in the absence of chemical differentiation triggers. The quantitative analysis of the alkaline phosphatase (ALP) activity and secreted mucus demonstrates the functional differentiation of the cells into enterocyte and goblet cell lineages. The millifluidic system, which has been developed and optimized for performance and cost efficiency, enables the creation and modulation of advanced intestinal models under biomimicking conditions, including tunable matrix stiffness and varying fluid shear stresses. Moreover, the readily accessible and scalable mucus-producing cellular tissue models permit comprehensive mucus analysis and the investigation of pathogen interactions and penetration, thereby offering the potential to advance our understanding of intestinal mucus in health and disease.

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BACKGROUND: There is a lack of literature on the length of the terminal ileum to be resected in right hemicolectomy for colon cancer. Therefore, we aimed to determine the mean ileal loop length and the effect of this variation on postoperative complications and long-term oncological outcomes in patients who underwent right hemicolectomy. METHODS: Right hemicolectomy surgeries performed for colon cancer in a tertiary care hospital between January 2011 and December 2018 were retrospectively analyzed from a prospective database. Two patient groups were established based on the mean length of the resected ileum above and below 7 cm. The two groups were compared for clinicopathological data, postoperative complications, mortality, long-term overall survival (OS) and disease-free survival (DFS). The factors contributing to OS and DFS were analyzed. RESULTS: The study included 217 patients. Body mass index (BMI) values were significantly higher in the ileum resection length > 7 cm group (p = 0.009). Pathological N stage, tumor diameter, and number of metastatic lymph nodes were significantly higher in the ileum resection length > 7 cm group (p = 0.001, p = 0.001, and p = 0.026, respectively). There was no significant difference for postoperative complication and mortality rates between the two groups. The mean follow-up period was 61.2 months (2-120) in all patients. The total number of deaths was 29 (11.7%) while the 60-month OS was 83.5% and 50-month DFS was 81.8%. There was no significant difference between the groups in terms of OS and DFS rates (p > 0.05). CONCLUSIONS: Excessive resection of the distal ileum in right hemicolectomy does not provide any benefit in terms of prognosis and complications.The ileum resection length and values close to it in our study appear to be sufficient.

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The co-occurrence of Thrombocytopenia with Absent Radius (TAR) syndrome and Langerhans Cell Histiocytosis (LCH) is exceedingly rare, with scant documentation in existing medical literature. This case report aims to shed light on this unique intersection of conditions, emphasizing the diagnostic and therapeutic challenges it presents. A 27-year-old female with a history of TAR syndrome presented with microcytic anemia, hip pain, and gastrointestinal symptoms. Terminal ileum intubation during colonoscopy revealed superficial ulcerations, leading to a biopsy that confirmed LCH. Subsequent radiologic investigations, including CT and MRI, showed multiple osseous lesions in the pelvis, sacrum, and skull. A treatment plan involving IV Cytarabine was initiated due to concerns of CNS involvement, as indicated by mastoid air cell involvement and symptoms of dizziness and ear fullness. The case highlights the diagnostic value of terminal ileum intubation during colonoscopy, which was pivotal in diagnosing LCH in this patient. It also discusses the use of IV cytarabine, a chemotherapy drug that inhibits DNA synthesis, as a suitable treatment option given the suspected CNS involvement. The case adds to the limited literature on the natural history and management of adult patients with LCH, particularly in the context of TAR syndrome. This case report serves as a compelling addition to medical literature, highlighting the diagnostic complexities and treatment considerations in a patient with both TAR syndrome and LCH. It emphasizes the importance of comprehensive diagnostic approaches, including terminal ileum intubation during colonoscopy, and introduces IV cytarabine as a viable treatment option for cases with suspected CNS involvement.

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The diagnostic value of ileoscopy is not well established, and its routine practice is controversial. We aimed to investigate the diagnostic value of biopsy for macroscopically abnormal lesions in the terminal ileum and to identify the association between endoscopic indications and findings and the presence of significant disease. This retrospective study included 551 patients who underwent biopsy of abnormal lesions in the terminal ileum (TI) during colonoscopy between February 2000 and June 2019. Biopsy results were analyzed in relation to the endoscopic indications and gross findings. Significant disease was defined as a case in which a specific disease was suspected or confirmed by the biopsy results, requiring additional examination or treatment. Among the 551 biopsies from macroscopically abnormal lesions in the TI, 44 (8.0%) had significant diseases. The frequency of significant disease was high in patients with clinically suspected inflammatory bowel disease (IBD) (50.0%), anemia (31.6%), right lower quadrant (RLQ) pain (28.6%), and radiological abnormalities in the TI (27.5%). The frequency of Crohn's disease (CD) was high in patients with clinically suspected IBD. A concurrent abnormality in the ileocecal valve (ICV) (14.3%) and the presence of an ulcer (14.2%), mass, or polyp (25.4%) correlated with a high incidence of significant disease, particularly CD. In cases of suspected IBD, anemia, RLQ pain, and radiologic abnormalities in the TI, there is a high possibility of significant disease. Ulcers, masses, polyps, and concurrent abnormalities in the ICV were also associated with significant disease.

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INTRODUCTION AND IMPORTANCE: Although IUD has become more popular in recent years, its migration through uterine perforation is a rare but serious complication. PRESENTATION OF CASE: We present the case of a young otherwise healthy woman with a missing IUD that had penetrated terminal ileum. CLINICAL DISCUSSION: The incidence of uterine perforation after IUD insertion has been reported 1.3 to 1.6 per 1000 insertions. Although a rare complication, it can cause serious problems requiring major surgery. CONCLUSION: Uterine perforation and migration of IUD is a rare but serious complication that should be considered in all missing IUD threads.

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BACKGROUND: Besides Crohn's disease (CD), there are a variety of other causes that can also lead to ulcerations in the terminal ileum. The purpose of this study was to identify useful diagnostic features for CD when evaluating terminal ileum biopsies in patients with endoscopic finding of ulcers. METHODS: Five hundred and seventy-one patients with endoscopic finding of ulcers were included in this retrospective study. Five main histological features were analysed, which were crypt irregularity, mucosal thickening, villous stromal widening (including villous atrophy), granulomas, and pseudopyloric gland metaplasia. Clinical and pathological features were determined by uni- and multivariable logistic regression. Then another independent cohort of 99 patients was established for verifying this nomogram. RESULTS: The crypt irregularity, mucosal thickening, and villous stromal widening were combined to be considered as one new variable named mucosal architectural change which was an independent variable in diagnosing CD. We found that mucosal architectural change, age <40 years, the presence of granulomas, and the presence of pseudopyloric gland metaplasia were independent factors for the pathological diagnosis of CD. Then nomogram was developed, with receiver operating characteristic (ROC) curve (area under the ROC curve [AUC] = 0.927) in training sets, and ROC curve (AUC = 0.913) in validation sets. CONCLUSIONS: We found mucosal architectural change is very helpful in distinguishing CD from non-CD patients. In the context of small biopsy which may lack full scope of changes, the model developed by combining these key features is valuable in predicting a diagnosis of CD, especially in younger patients (age <40 years).

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Introducción: la comprensión histomorfológica y biomolecular del íleon terminal; sitio clave en el control de la absorción nutricional, del metabolismo, sistema inmunitario, microbiota intestinal, y función de órganos extradigestivos; justifica su participación en los procesos inflamatorios intestinales, como pudiera ser en la infección por el SARS-CoV2. Objetivos: describir las evidencias biomoleculares de los componentes tisulares del íleon que justifican su función en el eje hepático-intestinal, y citar hallazgos histomorfológicos del íleon en fallecidos de la COVID-19. Adquisición de información: se realizó una revisión sistemática, crítica de los estudios biomoleculares sobre los enterocitos, la barrera epitelial intestinal, microbiota y permeabilidad intestinal del íleon que fundamentan su función de barrera epitelial, reportados en sitios Web (PubMed, Scielos, Lilacs, y Elservier), entre 2000 a 2021, y se citan hallazgos preliminares de cortes histomorfológicos del íleon en fallecidos de la COVID-19. Desarrollo se describen las evidencias biomoleculares del íleon normal, y la repercusión de su pérdida, disbiosis e hiperpermeabilidad en los procesos inflamatorios intestinales; también se citan hallazgos histomorfológicos preliminares de ileítis en fallecidos de la COVID-19, que pudiera fundamentar la importancia de la intuición biomolecular del íleon en el equilibrio salud-enfermedad, cuya pérdida justificaría el progreso clínico de la COVID-19. Conclusiones: la revisión integral del íleon y la cita de los hallazgos histomorfológicos preliminares de ileítis en fallecidos de la COVID-19, motiva realizar estudios amplios, que infieran su papel en el progreso clínico de la COVID-19 y justifique el futuro de nuevas intervenciones terapéuticas para su integridad.

Introduction terminal ileum, key site of control of nutritional absorption, metabolism, immune system, intestinal microbiota and extradigestive organ function. Histomorphological and biomolecular understanding of the ileum justifies its participation in intestinal inflammatory processes, such as SARS-CoV2 infection. Objective to describe the biomolecular evidence of the tissue components of the ileum that justifies its function in the hepatic-intestinal axis, and to cite histomorphological findings of the ileum in deaths from COVID-19. Information acquisition a systematic review was carried out, critical of reports between 2000 and 2021, on websites (PubMed, Scielos, Lilacs, and Elservier), of the biomolecular studies of the ileum (enterocytes, intestinal epithelial barrier, microbiota and intestinal permeability), which support its epithelial barrier function, and preliminary findings of histomorphological sections of the ileum in deaths from COVID-19 are cited. Development: biomolecular evidence of the normal ileum is described, and the repercussion of its loss, dysbiosis and hyperpermeability in intestinal inflammatory processes, and preliminary histomorphological findings of ileitis in deaths from COVID-19 are cited, which could substantiate the importance of the biomolecular intuition of the ileum in the health-disease balance, that its loss would justify the clinical progress of COVID-19. Conclusions: the comprehensive review of the ileum and the citation of the preliminary histomorphological findings of ileitis in deaths from COVID-19 motivates conducting extensive studies that infer its role in the clinical progress of COVID-19 and justify the future of new interventions. therapeutic for its integrity.

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Adult intussusception is much rarer than pediatric intussusception and usually occurs secondary to a pathological lead point, most frequently neoplasm. Terminal ileum lipomas are an infrequent cause of adult ileocolic intussusception but can be seen together with the intussusception on initial imaging evaluation, which can guide appropriate diagnosis and management. We describe a case of a 42-year-old man presenting with 12 hours of severe right lower quadrant pain. CT of the abdomen and pelvis demonstrated an ileocolic intussusception with fat-density lesions within the intussusception as well as in the distal ileum. The patient went to the operating room for laparoscopic ileocolic resection, during which ileo-ileal and ileocolic intussusceptions were identified in the terminal ileum and multiple fatty masses were palpated in the terminal ileum and cecum. Following ileocecectomy, surgical pathology confirmed terminal ileum with intussusception associated with multiple submucosal lipomas. We also review the literature for cases of ileocolic intussusception caused by terminal ileum lipomas. Patients presented with both acute and chronic symptoms, and while CT was the most common modality used for diagnosis, ultrasound and colonoscopy were also able to identify the intussusception. Although the intussusception was initially reduced in two patients, all patients ultimately underwent surgical resection.

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Fecal microbiota is a significant factor determining the cause, course, and prognosis of Crohn's disease (CD). However, the factors affecting mucosa-associated microbiota (MAM) remain unclear. This retrospective study examined the differences in ileal MAM between CD patients and healthy controls and investigated the factors affecting MAM in CD patients to clarify potential therapeutic targets. Ileal MAM was obtained using brush forceps during endoscopic examination from 23 healthy controls and 32 CD patients (most were in remission). The samples' microbiota was profiled using the Illumina MiSeq platform. Compared to controls, CD patients had significantly reduced α-diversity in the ileum and a difference in ß-diversity. The abundance of butyric acid-producing bacteria in the ileal MAM was significantly lower in CD patients with a history of abdominal surgery than in those without. Because butyric acid is a major energy source in the intestinal epithelium, its metabolism via ß-oxidation increases oxygen consumption in epithelial cells, reducing oxygen concentration in the intestinal lumen and increasing the abundance of obligate anaerobic bacteria. The suppression of obligate anaerobes in CD patients caused an overgrowth of facultative anaerobes. Summarily, reducing the abundance of butyric acid-producing bacteria in the ileal MAM may play an important role in CD pathophysiology.

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Escherichia coli (E. coli) is an important commensal in the human gut; however, it is unknown whether strains show site-specificity in the lower gut. To investigate this, we assessed genotypic and phenotypic differences in 37 clone pairs (two strains with very similar multiple locus variable-number-tandem-repeat analysis [MLVA] profiles) of E. coli isolated from mucosal biopsies of two different gut locations (terminal ileum and rectum). The clone pairs varied at the genomic level; single nucleotide polymorphisms (SNPs) were common, multiple nucleotide polymorphisms (MNPs) were observed but less common, and few indels (insertions and deletions) were detected. The variation was higher in clone pairs that are associated with non-human-associated sequence types (ST) compared to human-associated STs, such as ST95, ST131, and ST73. No gene(s) with non-synonymous mutations were found to be commonly associated with either the terminal ileum or the rectal strains. At the phenotypic level, we identified the metabolic signatures for some STs. Rectum strains of some STs showed consistently higher metabolic activity with particular carbon sources. Clone pairs belonging to specific STs showed distinct growth patterns under different pH conditions. Overall, this study showed that E. coli may exhibit genomic and phenotypic variability at different locations in the gut. Although genomics did not reveal significant information suggesting the site-specificity of strains, some phenotypic studies have suggested that strains may display site-specificity in the lower gut. These results provide insights into the nature and adaptation of E. coli in the lower gut of humans. To the best of our knowledge, no study has investigated or demonstrated the site-specificity of commensal E. coli in the human gut.

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BACKGROUND: Xanthogranulomatous inflammation (XGI) is an uncommon process involving an accumulation of inflammatory cells, commonly lipid-laden macrophages. XGI has been described to occur throughout the body but only rarely in the lower gastrointestinal tract. We describe a case of XGI contributing to chronic obstructive symptoms in the terminal ileum, in which the patient had an initial diagnostic laparoscopy, continued to have symptoms, then proceeded to have the definitive treatment. To our knowledge, this is the first report of XGI associated with a prior small bowel anastomosis. CASE SUMMARY: We report the case of a 42-year-old female who presented with intermittent epigastric pain and subjective fevers. She had undergone a laparoscopic small bowel resection for Meckel's diverticulum five years prior. Her workup was notable for computed tomography scan demonstrating mild inflammation and surrounding stranding at the level of the prior anastomosis. She underwent a laparotomy, resection of the prior anastomosis and re-anastomosis, with final histopathological examination findings consistent with mural XGI. CONCLUSION: XGI can occur at the site of a prior bowel anastomosis and cause chronic obstructive symptoms.

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A 34-year-old female presented with colicky abdominal pain and symptoms suggestive of subacute small bowel obstruction in the setting of Crohn's disease (CD). She was on maximal medical therapy and had undergone endoscopic balloon dilatation of a terminal ileal stricture on two occasions. Magnetic resonance enterography demonstrated acute inflammation in two segments of the terminal ileum. The patient proceeded to laparoscopic ileocolic resection. The histopathology revealed a segment of stricturing CD with chronic inflammatory change. There was also an unexpected finding of a segment of stricturing ileal disease secondary to endometriosis. Endometriosis affecting the ileum is uncommon, and concurrent CR and endometriosis is very rare. Further research is required to understand whether these two conditions are associated. Here, we present a discussion on the histopathology differences between endometriosis and CD. Clinicians are reminded of these rare concurrent conditions, as the symptomatology may mimic one another, thus impacting the treatment and management.

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AIM: The aim of this study was to clarify the length of the bowel specimen and to assess if the length was affected by certain characteristics. METHODS: Eligible patients were adults who had undergone right hemicolectomy for cancer in caecum, appendix, ascending colon or transverse colon from September 2019 to September 2020 at Herlev Hospital, Denmark. Data were collected from medical records. The primary outcome was the length of the resected terminal ileum. Secondary outcomes were to assess if body mass index (BMI), surgical approach, and neoadjuvant chemotherapy affected the length of the terminal ileum specimen, and to report the length of the colon specimen subdivided on the cancer locations. RESULTS: In total, 50 patients were included. The median age was 74 years (range 36-91), 30 patients (60%) were females, and BMI was median 26 (range 17-45). The variation in the length of terminal ileum specimen was median 5 cm (range 1-17). The explorative analyses showed significant positive correlation between the length of terminal ileum specimen and BMI (P = 0.050) but not surgical approach (P = 0.23) nor neoadjuvant chemotherapy (P = 0.51). The length of the colon specimen naturally differed according to the cancer location with a median length of 26 cm (range 14-90). CONCLUSION: We found a variation in the length of the terminal ileum specimen without an apparent explanation for this variation. The colon specimen also varied naturally according to cancer location.

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BACKGROUND: Nodular lymphoid hyperplasia (NLH) is known as a lymphoproliferative lesion in which multiple small nodules appear on the intestinal wall. It has been documented that patients who struggle with irritable bowel syndrome (IBS) are at greater risk of developing NLH. Here, we aimed to investigate the previously reported pathogens and the abundance of a selection of mucosal microbiota in IBS + NLH patients compared to IBS, and healthy controls. METHODS AND RESULTS: Terminal ileum biopsies were collected from 37 IBS + NLH, 37 IBS, and 29 healthy controls. Bacterial culture and PCR was performed to detect the presence of pathogens in biopsies. A qPCR assay was applied to assess the abundance of a selection of bacterial taxa. Totally, five bacterial isolates including two enteropathogenic and one enteroaggregative Escherichia coli (EPEC, EAEC), one enterotoxigenic Staphylococcus aureus (SEA), and one Yersinia enterocolitica strains were detected among the IBS + NLH cases. The relative abundance of Bacteroidetes and Streptococcus spp. in IBS + NLH patients was significantly less than IBS and healthy controls. Firmicutes, Pseudomonas spp., Haemophilus spp., and Campylobacter spp. were notably more abundant in IBS + NLH than in IBS patients. The abundance of Verrucomicrobia was higher in NLH + IBS than in healthy controls. Actinobacteria was also significantly more abundant among NLH + IBS patients than the controls. CONCLUSION: Our results demonstrated that mucosal microbiota composition in NLH + IBS patients slightly differs from that of IBS patients and healthy controls. Further research using large-scale cohorts are needed to enhance current understanding of the contribution of the mucosal microbiota to NLH pathogenesis with concurrent IBS.

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BACKGROUND: The efficacy and safety of endoscopic submucosal dissection (ESD) for tumors extending into the terminal ileum remain obscure. We aimed to evaluate the outcomes of ESD for tumors involving the ileocecal valve (ICV) with extension into the terminal ileum. METHODS: Sixty-eight patients (40 men; mean age, 67 years) with 68 tumors involving the ICV that were resected by ESD between December 2013 and December 2018 were included and classified into Group A (21 tumors with extension into the terminal ileum) and Group B (47 tumors without extension). ESD outcomes were compared between groups. RESULTS: The clinical features of the patients and tumors were not significantly different between the groups. There were no significant differences in en bloc resection rate (95% and 94%, respectively; p = 0.79), R0 resection rate (90% and 89%, respectively; p = 0.89), procedure time (95 ± 54 min and 94 ± 69 min, respectively; p = 0.64), postoperative bleeding rate (5% and 3%, respectively; p = 0.79), intraoperative perforation rate (0% and 4%, respectively; p = 0.34), delayed perforation rate (0% and 0%, respectively), or postoperative symptomatic stenosis rate (0% and 0%, respectively) between Groups A and B. No specific factors related to the outcomes of ESD were found by subgroup analysis according to the dominance and degree of circumference of the ICV. Local recurrence was observed in 1 patient in Group A who was retreated using ESD. CONCLUSIONS: ESD for tumors involving the ICV with extension into the terminal ileum is safe and effective.

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Gastrointestinal stromal tumors (GISTs) are rare in young individuals and typically affect older adults. We present the case of a previously healthy male who presented with severe hematochezia, fatigue, and dizziness. Colonoscopy did not demonstrate any colonic mass. CT of the pelvis with contrast revealed a pelvic mass measuring 7.4 cm. Biopsy confirmed a low-grade mixed-type GIST of the terminal ileum. Surgical resection was successfully performed. Histopathological analysis further characterized the tumor, and the patient was discharged with consideration of adjuvant imatinib therapy. This case underscores the importance of thorough diagnostic evaluation and multidisciplinary management for atypical presentations of gastrointestinal bleeding in young patients.

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We aim to present a rare case of a missing intrauterine contraceptive device (IUCD) that was found in the terminal ileum by laparoscopy and was managed initially by laparoscopy and then proceeded to laparotomy. A 29-year-old female who had a copper IUCD inserted by a senior gynecologist presented to the clinic with pelvic pain and discomfort. She underwent laparoscopy for IUCD removal. Intraoperatively, the IUCD was discovered to be embedded in the terminal ileum, and therefore, laparoscopy was converted to an open laparotomy. The patient was readmitted multiple times because of abnormal fluid collection in the pelvic region, which was resolved finally by pigtail insertion. This case sheds a light on the possibility of complications occurring in the medical field even if the practitioner is a senior gynecologist. Furthermore, missed IUCDs require thorough investigation and imaging to make an appropriate management plan to avoid serious complications.

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Background: Nonspecific terminal ileal ulcers are one of the common ulcerative diseases in terminal ileum. However, the studies about treatment efficacy are scarce. We aimed to investigate the efficacy of mesalazine in the treatment of this disease. Methods: Eighty-two patients with nonspecific terminal ileal ulcers who sought outpatient medical treatment in the Division of Gastroenterology, Wuhan Union Hospital, from April 2016 to January 2019 were enrolled and randomly divided into two groups. The experimental group took mesalazine orally, 4.0 g/d, once a day for 3 months. The control group was followed up without special intervention. The primary endpoint was the endoscopic remission rate at the 6th and 12th month. Secondary endpoints included the clinical remission rate at the 1st, 6th and 12th month and adverse events (ChiCTR1900027503). Results: About the endoscopic efficacy, the remission rate of the experimental group and control group was 73.2 versus 61.0% at the 6th month (RR = 1.20, 95%CI 0.88∼1.63, p = 0.24) and 87.8 versus 78.0% at the 12th month (RR = 1.13, 95%CI 0.92∼1.37, p = 0.24). About the clinical efficacy, the remission rate was 70.3 versus 43.8% at the 1st month (RR = 1.61, 95%CI 1.03∼2.51, p = 0.03), 83.8 versus 68.8% at the 6th month (RR = 1.22, 95%CI 0.93∼1.60, p = 0.14) and 91.9 versus 81.3% at the 12th month (RR = 1.13, 95%CI 0.93∼1.37, p = 0.34). During follow-up, no patients were diagnosed with Crohn's disease or intestinal tuberculosis, and no patients developed significant complications. Conclusion: For patients with nonspecific terminal ileal ulcers, there is no disease progression over a short term. In addition, there is no significant difference in clinical or endoscopic efficacy between patients who received mesalazine and patients who are followed up without special intervention.