Acute abdomen due to Meckel's diverticulitis with synchronous inflammatory myofibroblastic tumor in the terminal ileum: A case report.

Meckel's diverticulum (MD) is the most common congenital anomaly of the gastrointestinal system, occurring in approximately 2% of the population. It is rare for MD to be symptomatic or complicated in adulthood. In this case report, we describe a patient who was admitted to the clinic with Meckel's diverticulitis, which had fistulized to the anterior abdominal wall, and was incidentally found to have an ileal inflammatory myofibroblastic tumor (IMT) on radiological imaging. A 46-year-old male patient presented to the emergency department with abdominal pain. Physical examination revealed localized guarding on the right side of the umbilicus. Blood tests showed elevated acute-phase reactants, including a white blood cell count of 13,800/µL, and C-reactive protein (CRP) level of 165 mg/L. Abdominal computed tomography demonstrated Meckel's diverticulitis fistulizing to the anterior abdominal wall and a polypoid structure in the ileum distal to the MD. The patient underwent emergency surgery, during which segmental ileal resection and ileocolic anastomosis were performed. On the fourth postoperative day, the patient developed an anastomotic leak. Relaparotomy, right hemicolectomy with end ileostomy, and mucous fistula creation were subsequently performed. Pathological examination of the resected ileum from the initial surgery revealed a benign IMT distal to the MD. The patient was discharged on the 40th postoperative day after developing a surgical site infection following the second surgery. The end ileostomy was closed six months later. In this case, it appears that the ileal IMT located distal to the MD may have caused intermittent intestinal obstruction, fecal stasis, and the development of Meckel's diverticulitis. Furthermore, a detailed examination of the patient's history, laboratory results, and radiologic tests may contribute to the detection of incidental pathologies and influence treatment choices.

Meckel's Diverticulum in Adult Geese (Alopochen egyptiacus): A Comprehensive Study of Structure Using Histological, Electron Microscopy, and Immunohistochemical Methods.

INTRODUCTION: The intestine plays an important role in mediating between the bird and its nutritional environment. The yolk stalk, also known as Meckel's diverticulum, is a landmark between the jejunum and ileum. This work aimed to investigate the anatomical, histological, and electron microscopical features of cellular components of the Meckel's diverticulum (MD) in adult geese. METHODS: The intestine was dissected from the bird's body cavity, and Meckel's diverticulum was exposed and prepared for light and electron microscopical examinations. RESULTS: Our results revealed that the MD mucosa is thrown up into villi and crypts, and the mucosal epithelium is a columnar epithelium with goblet cells as well as intraepithelial lymphocytes. Lymphoid follicles and numerous immune cells were demonstrated within the lamina propria. The mucous glands were also observed within the lamina propria and among the lymphoid follicles. The lining epithelium of MD appeared with different staining affinities: dark cells (electron-dense) and light cells (electron-lucent) contained few mitochondria and more secretory vesicles, while dark cells contained more mitochondria and fewer secretory vesicles. Immunohistochemical analysis of MD revealed positive immunoreactivity for several markers, such as CD117, chromogranin, PLCß, cytokeratin, MHC II, and S100. CONCLUSION: Taken together, our findings suggest that MD is considered an immune organ in adult geese.

Imaging congenital anomalies of the ileum in adults:a pictorial review.

The ileal loops are anatomical location for the majority of congenital anomalies affecting the gastrointestinal tract. These include Meckel's diverticulum, ileal duplication, dysgenesis, atresia, mucosal diaphragm, and malposition of the ileum. Symptomatic lesions that often present with abdominal pain, intestinal obstruction or bleeding are usually diagnosed and treated during infancy and childhood. However, many of these congenital conditions may remain clinically silent and detected incidentally in adults undergoing radiological evaluation for unrelated medical reasons. This article presents the spectrum of the congenital ileal anomalies and their distinct features on small bowel examination and CT of the abdomen.

The First Mouse Model of Meckel's Diverticulum Carcinoma.

BACKGROUND: Cancer of the Meckel's diverticulum (MD) is extremely rare. It is often advanced at the time of operation and the prognosis is poor. An effective treatment for this cancer has not yet been developed and there is no MD-carcinoma mouse model. MATERIALS AND METHODS: MD carcinoma was established as a patient-derived xenograft (PDX) in 5-week-old male nude mice by subcutaneous transplantation of surgical specimens together with surrounding normal tissue. Hematoxylin and eosin (H&E) staining was performed on paraffin-embedded tissue sections of the original tumor resected from patients and transplanted tumors grown in nude mice. RESULTS: Three of five mice implanted with MD tumor fragments grew. MD-carcinoma histopathology, observed with H&E-stained tissue sections of the tumors grown in the mice and tumor from the original patient, was concordant. Both showed the luminal structures characteristic of MD carcinoma, and the lumens were filled with serous fluid. CONCLUSION: The first PDX mouse model of MD carcinoma has been established. The PDX model maintained MD-carcinoma histology of the tumor in the patient. The MD carcinoma mouse model will enable basic research on MD carcinoma, as well as the testing of novel therapeutic agents.

[Analysis of clinical characteristics of 126 children with recurrent intussusception].

Objective: To analyze and summarize the clinical features in children with recurrent intussusception. Methods: This retrospective cohort study collected the clinical data of 126 children with recurrent intussusception who were admitted to the Children's Hospital of Zhejiang University School of Medicine due to "abdominal pain, paroxysmal crying, vomiting, bloody stools" from January 1, 2015 to November 30, 2019. The clinical manifestations of recurrent intussusception between ≤3 years old group and >3 years old group were compared, the etiology and age characteristics of pathologic lead points (PLP) were analyzed, and the clinical characteristics of PLP group and non-PLP group were also compared. The χ2 test and Mann-Whitney U test were used to compare the differences between groups. Results: A total of 126 children with recurrent intussusception were included, of whom 76 were males and 50 were females, with the age of 2.9 (1.7, 5.1) years. The proportion of children aged more than 1 year was 87.3% (110/126), and 48.4% (61/126) more than 3 years. Clinical manifestations mostly lacked the typical triad of symptoms. The percentage of paroxysmal crying in ≤ 3 years old group was significantly higher than that in >3 years old group (52.3% (34/65) vs. 24.6% (15/61), χ2=10.17, P=0.001), while the percentage of abdominal pain was significantly lower than that in the >3 years old group (46.1% (30/65) vs. 75.4% (46/61), χ2=11.25, P=0.001). The rate of positive ultrasound examination was 17.5% (22/126), and 63.6% (14/22) of them were diagnosed. The positive rate of CT examination was 4/13, of which 2 cases were diagnosed. In this study, 37 children were diagnosed with PLP by colonoscopy, laparoscopy or laparotomy, and 89 children were found without PLP. The positive rate of PLP in >3 years old group was significantly higher than that in ≤3 years old group (37.7% (23/61) vs. 21.5% (14/65), χ2=3.96, P=0.046). Meckel's diverticulum and juvenile polyp were the main contributors of PLP in ≤3 years old group, accounting for 7/14 and 3/14 respectively, while lymphoma and juvenile polyp accounted for 34.8% (8/23) and 26.1% (6/23), respectively in >3 years old group. Compared with non-PLP group, PLP group had higher age (5.2 (1.6, 6.7) vs. 2.7 (1.8, 4.2) years, Z=-2.26, P=0.01). However, there were no significant differences in gender and recurrence frequency between the two groups (both P>0.05). Conclusions: Recurrent intussusception is more common in children more than 1 year old, and has a wide spectrum of non-specific clinical presentations. Imaging examinations can be used to identify PLP. The most recurrent intussusception is idiopathic, but the presence of PLP should be alerted for, such as Meckel's diverticulum, lymphoma and juvenile polyp. Colonoscopy sometimes is necessary, surgical exploration and treatment should be carried out in time.

Meckel's Diverticulum with Dieulafoy's Lesion: A Cause of Severe Hematochezia.

BACKGROUND: Meckel's diverticulum (MD) is a remnant of the omphalomesenteric duct. Although the majority of MD are asymptomatic, it can present with severe hematochezia. Hematochezia is generally considered to result from a peptic ulcer caused by ectopic gastric mucosa in MD. However, this hypothesis has not been proved. METHODS: 10 cases of surgically resected MD initially presenting with severe hematochezia were histologically examined. RESULTS: Ectopic gastric mucosa was present in 9 cases, two of which also contained ectopic pancreas. No ectopic tissue was found in one case, which shows that bleeding can occur in MD without ectopic gastric mucosa. In addition, a rupture of aberrant submucosal arterioles through the overlying mucosa, a vascular abnormality called Dieulafoy's lesion, was detected in all the 10 cases. CONCLUSION: This study suggests that the actual cause of massive bleeding in MD is not a peptic ulcer, but Dieulafoy's lesion.

Meckel's Diverticulum Bleeding Missed by the First but Detected by the Second Capsule Endoscopy.

A 13-year-old boy was admitted to our hospital because of bloody stools. Although a Meckel's diverticulum (MD) was suspected, capsule endoscopy (CE) revealed no remarkable findings. Seven months later, he was admitted again because of rebleeding. CE was performed again and revealed an elevated lesion and fresh blood in the ileum. A single balloon endoscopic examination revealed a diverticulum with an elevated lesion in it. Histologic findings showed ectopic gastric mucosa, thus we diagnosed this patient as having MD. Although CE is useful for the examination of obscure gastrointestinal bleeding, a single CE is not enough to diagnose MD bleeding. The timing in performing CE and the evaluation of other modalities would be valuable for patients suspected of having MD.

The diagnostic and treatment values of double-balloon enteroscopy in children's Meckel's diverticular bleeding.

ABSTRACT: The diagnostic and treatment values and safety of preoperative double-balloon enteroscopy (DBE) for Meckel's diverticula (MD) bleeding in children by retrospective review and analyses.The clinical data were collected and analyzed from 10 cases of children with MD receiving preoperative DBE examination and postoperative pathological confirmation. The diagnostic and treatment values and safety were assessed through the comparison of the DBE results and intra-operative observations and subsequently postoperative pathological results.Total cases are 10, 7 males and 3 females. The male to female ratio is 2.3 to 1. The youngest patient is 3.3 years old and oldest 12.1, the average age is 7.4 ±â€Š3.0. The lowest body weight is 12.6 kg and the average is 32.5 ±â€Š18.9 kg. The hematochezia was the main clinical manifestation in all patients with anemia and moderate to severe anemia were common (9/10, 90%). All patients had and tolerated the DBE procedures via anal route with 100% success rate. There were no observable complications during the examinations and post operations. All patients were diagnosed with MD by DBE. Exploratory laparoscopy and surgical operations were subsequently performed. All surgical samples were confirmed by pathology as bleeding MD. The postoperative follow-ups up to April 2019 (from 3 to 12 months) do not show any bleeding sign. Pathological examinations found ectopic gastric mucosa in 9 patients (90%) and one case had both ectopic gastric mucosa pancreatic tissue (10%). The distance of MD to ileocecal valve was from 60 to 100 cm (average 81.0 ±â€Š16.0 cm) by DBE examinations. Surgery showed similar findings from 30 to 100 cm (average 71.0 ±â€Š18.5) consistently to DBE. There is no statistical significance between 2 methods (Ζ = 1.715, Ρ = .086).DBE examination proves to be a safe method for diagnosing children's MD disease and can reliably determine the bleeding lesions in children's MD, providing valuable guidance for surgical treatment of children's MD bleeding.

Pancreatic Endocrine Heterotopia Involving Meckel's Diverticulum: A Potential Mimic of Neuroendocrine Tumor.

Pancreatic heterotopia most commonly occurs in the upper gastrointestinal tract, but can occur in other sites, including Meckel's diverticulum. When multiple histologic elements of the pancreatic tissue (acini, ducts, and endocrine cells) are present, the diagnosis is typically straightforward. In this article, we report a rare case of pure endocrine pancreatic heterotopia involving a Meckel's diverticulum, a potential mimic of a well-differentiated neuroendocrine tumor. Several features were useful in making the distinction, including lack of desmoplasia and mass forming lesion, and immunohistochemical staining in a physiological pattern similar to that of islets of Langerhans. It is important for pathologists to be aware of this entity and its features to avoid misdiagnosis of a neuroendocrine tumor.

Recurrent intestinal inflammation with a perianal abscess is not always Crohn's disease: a patient with a complex Meckel's diverticulum diagnosed by double-balloon endoscopy.

Recurrent intestinal inflammation and refractory perianal abscesses are typical manifestations of Crohn's disease. However, these conditions are not always due to Crohn's disease. A 25-year-old male with recurrent perianal abscesses for 1 year, suspected to be due to Crohn's disease, was referred for further evaluation. Computed tomography scan showed a perianal abscess abutting the small intestine. A complicated Meckel's diverticulum was suspected based on these findings. Meckel's diverticulum scintigraphy was negative. Bidirectional double-balloon endoscopy (DBE) identified a long diverticulum in the ileum. In this long diverticulum, a tight stricture was seen 5 cm distal to the diverticular opening. A selective contrast study showed a 10 cm diverticulum distal to the stricture, with three strictures in the long diverticulum. Inflammation of the Meckel's diverticulum due to bacterial overgrowth was suspected as a cause of the refractory perianal abscesses. Laparoscopic diverticulectomy was performed, and the specimen showed a 10 cm diverticulum containing post-inflammatory changes with scar formation. The perianal abscess was confirmed to be caused by an inflamed Meckel's diverticulum. The patient has been asymptomatic for 6 years after resection. DBE before exploratory laparotomy should be considered to investigate the cause of an abscess that could be secondary to small intestinal pathology.

Beware the Innocent Presentation of a Spontaneous Perforated Meckel Diverticulum: A Rare Case and Review of the Literature.

Perforation of a Meckel diverticulum in a preterm neonate is very rare. To our knowledge, only 7 cases of spontaneous Meckel perforation in a preterm neonate have previously been described in the literature. The etiology is uncertain. We present the case of a 30-week preterm female twin with a spontaneous Meckel diverticulum perforation discovered on day 3 of life and review the published cases. A possible etiological explanation for this rare entity at this age group is also suggested.

Management of incidentally discovered unaffected Meckel's diverticulum - a review.

Meckel's diverticulum is the most common congenital malformation of the gastrointestinal tract, with its incidence estimated at 1-4% in the general population. In most cases Meckel's diverticulum is a latent, asymptomatic anomaly, but in some cases, it may lead to complications such as intestinal obstruction, bleeding and inflammation. The literature provides no precise recommendations for the management of accidentally diagnosed, unaffected Meckel's diverticulum. The aim of this study was to review the literature on the subject to determine the current state of knowledge. Based on an analysis of 17 papers, the following criteria (risk factors) were identified justifying 'preventive' resection of an accidentally found, unaffected Meckel's diverticulum: age <50 years, male gender, length >2 cm, macroscopic abnormalities suggesting the presence of ectopic gastric mucosa as well as narrow neck of the diverticulum. When the criteria are not met, there is a minimal lifetime risk of complications. Leaving diverticulum intact is recommended in cases of peritonitis, major abdominal trauma and at older age. Nevertheless, indications or contraindications for resection are relative, and surgeons are safe to make their decision depending on individual patient's situation.

Adult intussusception associated with mesenteric Meckel's diverticulum and antimesenteric ileal polyp.

Meckel's diverticulum is the most common congenital abnormality affecting the gastrointestinal tract, affecting 4% of the general population. It is classically located on the antimesenteric border of the ileum within 100 cm of the ileocaecal valve. Complications may include haemorrhage, bowel obstruction, diverticulitis, perforation and malignancy. This report explores the case of intussusception in an adult, in association with a mesenteric Meckel's diverticulum and adjacent benign polyp. A 40-year-old man presented with acute abdominal pain, affecting the central abdomen and both flanks. CT imaging revealed small bowel intussusception, with either a Meckel's diverticulum or polyp acting as a lead point. Intraoperatively, the intussusception had already resolved; however, an inflamed outpouching was identified on the mesenteric border of the ileum, with a firm mass palpable within the bowel lumen. A 70 mm small bowel resection and primary anastomosis were performed. Histopathological analysis confirmed an inflamed Meckel's diverticulum as well as an adjacent diverticulum comprising a benign polyp.