Adult intestinal intussusception: CT appearances and identification of a causative lead point

Bowel intussusception in adult: Prevalence, diagnostic tools and therapy

Intussusception is defined as invagination of one segment of the bowel into an immediately adjacent segment. The intussusception refers to the proximal segment that invaginates into the distal segment, or the intussusception (recipient segment). Intussusception, more common occur in the small bowel and rarely involve only the large bowel. In direct contrast to pediatric etiologies, adult intussusception is associated with an identifiable cause in almost all the symptomatic cases while the idiopathic causes are extremely rare. As there are many common causes of acute abdomen, intussusception should be considered when more frequent etiologies have been ruled out. In this review, we discuss the symptoms, location, etiology, characteristics, diagnostic methods and treatment strategies of this rare and enigmatic clinical entity in adult.

Adult Intussusception: An Uncommon Condition and Challenging Management

INTRODUCTION

Intussusception is a rare condition in adults. A pathological lesion is usually found with a significant percentage of malignancy. The optimal treatment is still not universally clear.

METHODS

This is a retrospective review of adult patients with a diagnosis of intestinal intussusception and surgically treated at our institution from January 2009 to December 2018. Clinical, operative, and histological details were collected and analyzed.

RESULTS

A total of 26 cases, 16 males and 10 females, were diagnosed with surgically proven intussusception during the 10-year period. The mean age was 45 years (range 21-70). Using ultrasound and/or computed tomography as imaging study, the preoperative diagnosis was made in 21/26 (81%) patients. Five intussusceptions were discovered only upon exploratory laparotomy for intestinal obstruction. There were 19 (73%) cases of enteric and 7 (27%) cases of colonic intussusceptions. All patients underwent surgical exploration. Intestinal resection with immediate anastomosis was the technique of choice for most patients. A single patient underwent stoma for peritonitis secondary to intestinal perforation. An organic cause has been systematically revealed, and no idiopathic intussusception was detected. Etiology was malignant in 9 (35%) cases.

CONCLUSION

Adult intussusception should be considered in any patient with subacute abdominal pain. Considering the high rate of malignancy, intestinal resection without attempting reduction is highly recommended for colonic intussusceptions. However, a more selective approach can be adopted for enteric intussusceptions.

Ileocecal Intussusception of the Adult Induced By the Gastrointestinal Stromal Tumor of the Ileocecal Valve – A Case Report

Adult intussusception is a rare entity which is distinct from paediatric cases in incidence, aetiology, and management. It represents 5% of all intussusceptions and is the cause of 1% of all intestinal obstructions, 0,08% of all abdominal surgeries and 0,003-0,02% of all hospital admissions. Ileocolic intussusception in adults is a unique variant in which nearly 100% of cases have a malignant lead point. In our report, we described a case of a patient with ileocecal intussusception caused by a rare type of the gastrointestinal tumor. The female patient was admitted to hospital for occasional pain in the lower right quadrant of the abdomen followed by abdominal discomfort and appearance of blood in the stool. The result of CT scan of the abdomen and pelvis showed a tumor mass and intussusception at the ileocecal junction, which was confirmed peroperatively. Open right hemicolectomy was performed adhering to oncological principles. The final pathologic diagnosis indicated the gastrointestinal stromal tumor of the ileocecal valvе. The diagnosis of intussusception in adults is delicate, and timely surgical treatment can be vital. Patients with the palpable abdominal mass, digestive tract obstruction, gastrointestinal bleeding, or lead point computed tomography must undergo a surgical examination. Given a high risk of malignancy, primary surgical resection using oncologic principles presents the best option for the treatment of ileocecal intussusception in adults.

Pedunculated sigmoid lipoma causing colo-colonic intussusception

This case report describes a 52-year-old man who presented with 2 weeks of left lower quadrant pain and bloody stool. Computed tomography revealed a 4 cm, fat-density mass acting as a lead point for intussusception of the sigmoid colon. Surgical resection was successfully performed, and histologic evaluation confirmed the diagnosis of a pedunculated colonic lipoma. Intussusception of the colon is uncommon in adults and is often associated with malignancy, but other nonmalignant causes such as a lipoma may also present similarly with obstructive symptoms, bloody stool, and/or intermittent abdominal pain. Colonic lipoma should be considered in the differential of a patient with clinical or imaging evidence of intussusception, with primary resection leading to an excellent prognosis.

Differentiation Between Surgical and Nonsurgical Intussusception: A Diagnostic Model Using Multi-Detector Computed Tomography

BACKGROUND

The differentiation of surgical from nonsurgical adult intussusception may enable the appropriate selection of management strategies.

OBJECTIVE

This study aimed to investigate the diagnostic potential of multidetector computed tomography (MCDT) features to differentiate surgical from nonsurgical adult intussusception and develop a diagnostic model.

METHODS

A retrospective study was performed on 96 patients with intussusceptions at the University Medical Center Hospital between January 2014 and January 2020. Two radiologists reviewed all images, and intussusception characteristics were documented. The location of intussusception, length, diameter, interposed fat thickness, lead point, and complications were evaluated. Based on the results, a diagnostic tree model was developed to differentiate between surgical and nonsurgical adult intussusception.

RESULTS

A total of 99 intussusceptions in 96 patients (mean age: 53.0 ± 16.5 years), including 35 (35.3%) enteroenteric, 27 (27.3%) enterocolic, and 37 (37.4%) colocolic lesions, were evaluated. Of the enteroenteric intussusceptions, 22 (62.9%) were surgical, including 19 (79.2%) with lead points. Among colon intussusceptions, 63 (98.4%) were surgical, and 100% had lead points. The characteristics used to predict surgical intussusceptions included lead point presence, length ≥ 5.0 cm, diameter ≥ 3.2 cm, interposed fat thickness ≥ 0.5 cm, and complications (p < 0.001). Based on these features, we established a diagnostic tree model that correctly classified 96 (97%) of 99 lesions.

CONCLUSION

Our study reinforces the importance of MDCT for the diagnosis and guided management of adult intussusceptions. The characteristics that predicted surgical intussusceptions included lead points, length, diameter, interposed fat thickness, and complications. A systematic approach using this diagnostic tree model could be used to distinguish surgical and nonsurgical adult intussusception.

Role of imaging in the evaluation of intussusception in adults: a 10-year retrospective study

INTRODUCTION

Intussusception is the insertion of a bowel loop segment into an adjacent segment. Unlike in children, where the condition is mainly idiopathic, intussusception in adults is more often associated with severe disease. The growing use of imaging studies to evaluate the abdomen has resulted in a higher rate of detection of cases of intussusception without underlying disease in which it is not possible to determine the cause. This study aimed to review the clinical presentation, evaluation, and treatment of patients in whom abdominal ultrasonography or computed tomography diagnosed intussusception.

METHOD

We retrospectively reviewed radiology reports of abdominal ultrasound and computed tomography studies done at our hospital in a 10-year period.

RESULTS

In the 40 cases found, intussusception was an incidental finding in 10%. No underlying cause was identified in 68%, and posterior imaging studies showed spontaneous resolution in 75%. The most common symptom was abdominal pain, being present in 60%. Intussusception affected only the small bowel in 90% of cases (entero-enteric intussusception). Intussusception was attributed to malignancy in only 8% of cases. In 7 patients, intussusception was resolved surgically.

CONCLUSION

The increased use of abdominal imaging has shown that a significant proportion of cases of intussusception are idiopathic and resolve spontaneously.

Insidious presentation of intussusception with appendicitis

Intussusception in relation to appendicitis is an uncommon occurrence and is rarely described in the literature. We describe a case of diagnostic uncertainty and finding of ileocolic intussusception associated with appendicitis in a 22-year-old male. The patient presented with a history of acute right-sided abdominal pain. He underwent a computed tomography scan showing ileocolic intussusception following an operation with the finding of an inflamed appendix, which was likely to have served as a mechanical lead point of the intussusception. Due to the presence of ischaemia of the right colon, he underwent a right hemicolectomy.

Leiomyosarcoma of the Sigmoid Colon Causing Sigmoido-Rectal Intussusception: A Case Report

The most common malignant tumors in the colon are adenocarcinomas, while leiomyosarcoma (LMS) are rare. Here, we report a case of LMS of the sigmoid colon in a 73-year-old man who presented with sigmoido-rectal intussusception, which was discovered by abdominal computed tomography. As LMS of the colon is uncommon and is rarely associated with intussusception, we have described the imaging features in this case report.

Non-traumatic abdominal pain: assessment of diagnostic value of MDCT enterography in small bowel diseases—a retrospective study

Background

Because of its unique anatomy, overlap of its loops, and its continuous peristaltic motion, imaging of the small bowel is a big challenge. Non-traumatic abdominal pain of small bowel origin includes a spectrum of medical and surgical conditions ranging from minor to life-threatening conditions. Accurate diagnosis of these diseases is essential to reduce morbidity and mortality. The aim of our study is to assess the role of MDCT enterography in evaluation and diagnosis of different small bowel causes of non-traumatic abdominal pain.

Results

Data analysis of 47 patients’ files included in this study revealed a high diagnostic accuracy of MDCTE in diagnosing variable small bowel-related pathologies that were confirmed histopathologically.

Conclusion

MDCTE can be used as a reliable diagnostic imaging modality for the detection of small bowel diseases. However, operative data and tissue biopsy are still the confirmatory methods for diagnosis.

Successful laparoscopic approach for idiopathic adult colo-colonic intussusception: a case report

Background

Adult intussusception is recognized as an abdominal emergency. More than 90% of adult patients with intussusception have distinct causes that are related to benign or malignant tumors. In contrast, idiopathic intussusceptions, which are observed in children, are rare conditions in adult. Especially, colo-colonic idiopathic intussusceptions are rare among them. Surgery is traditionally considered the primary treatment option. Recently, laparoscopic surgery has been reported to be safe and feasible. However, laparoscopic surgical reduction, which is a common procedure in pediatric surgery, is not common in adult intussusception.

Case presentation

We report a 34-year-old man who presented with sudden abdominal pain. Computed tomography revealed the target sign in the transverse colon. There was no evidence of bowel obstruction, bowel wall edema, or tumor. We diagnosed idiopathic intussusception and selected laparoscopic procedure because of the strong abdominal pain experienced by the patient. There were no signs of perforation, bowel wall ischemia, or tumor in abdominal cavity. We confirmed idiopathic colo-colonic anterograde intussusception. Laparoscopic surgical reduction was achieved by a combination of delicate direct pressure on the anal side of the transverse colon and gentle pulling on the oral side. The patient’s postoperative course was uneventful.

Conclusions

We achieved successful surgical reduction laparoscopically because of an accurate preoperative diagnosis based on characteristic computed tomography features and appropriate surgical technique. Laparoscopic procedure and surgical reduction is considered to be an effective treatment strategy for adult idiopathic intussusceptions with severe symptoms.

Heterotopic Gastric Mucosa in the Ileum: A Rare Cause for Intussusception in Adults

Intussusception is the leading cause for intestinal obstruction in children. However, it accounts for only 5% of bowel obstructions in adults. Heterotopic gastric mucosa (HGM) can occur anywhere in the gastrointestinal tract; nevertheless, its occurrence in the small intestine is rare unless associated with remnants of vitelline duct (Meckel's diverticulum). Herein, we describe a case of a 33-year-old male who presented with symptoms and signs of intestinal obstruction caused by ileo-colic intussusception, in which polypoid HGM acted as the organic lead point for intussusception. Several cases of intussusception caused by HGM have been reported in pediatric age group; however, this event is exceedingly rare in adults.

Small bowel knots

INTRODUCTION

Intertwining of bowel loops to form a knot is very rare cause of intestinal obstruction. Among intestinal knots, ileoileal knotting is the most rare, with only a handful of cases reported in literature. We present a rare case of ileoileal knotting and review of small bowel knots. The aim of this review was to summarise the existing evidence on small bowel knots and to postulate the possible mechanisms for knotting.

METHODS

A systematic search was conducted for literature published up to December 2019 using MEDLINE, PubMed and Google Scholar databases, together with the references of the full-text articles retrieved. Papers with case reports of small bowel knots were considered to be eligible for inclusion in the review.

FINDINGS

A total of 14 case reports were evaluated. There was no clear predilection for age or sex. Mostly cases were from Asia and Africa with no cases from the West. The presenting complaints were abdominal pain (93%), vomiting (64%), abdominal distention (57 %) and obstipation (43%). The bowel was gangrenous in 78% of cases. All underwent exploration, with the majority requiring resection and anastomosis of the involved segment.

CONCLUSION

Ileoileal knotting is a very rare cause of intestinal obstruction. Possible mechanisms include loaded bowel with longer mesentery, vigorous peristalsis, single bulky meal, pregnancy and intussusception. The condition is extremely difficult to diagnose preoperatively and it is usually diagnosed intraoperatively. The standard of treatment is resection of gangrenous part and anastomosis.

A multicentre comparative study between laparoscopic and open surgery for intussusception in adults

AIM

Intussusception in adults is rare and requires surgery in most cases. While abdominal laparoscopic surgery (LS) is becoming more popular, there are few reports on the outcomes of adult intussusception treated with LS. This study compared the feasibility of LS vs open surgery (OS) for adult intussusception.

METHOD

We reviewed retrospectively the medical records of adult patients with intussusception from three tertiary hospitals between 2000 and 2016. The patients were divided into LS and OS groups, and their surgical outcomes were compared.

RESULTS

Surgery was indicated in 71 patients with intussusception (41 LS and 30 OS). The median age of the patients was 49.0 and 51.5 years in the LS and OS groups, respectively (P = 0.930). Overall, nine (12.7%) patients had a negative laparotomy or laparoscopy with spontaneous reduction of the intussusception. Conversion to OS from LS was necessary in one patient (2.4%). The operative time and intra-operative and postoperative complication rates were not significantly different. However, there were more serious complications such as bowel perforation and major vessel injury in the LS group. The patients in the LS group had a shorter time to first food intake and hospital stay vs patients in the OS group (4.0 vs 6.0 days, P < 0.001, and 7.0 vs 10.5 days, P < 0.001, respectively).

CONCLUSION

LS may be feasible for adult intussusception; there may be more severe intra-operative complications than in OS.

Use of Ultrasound in the Diagnostic Work-Up of Adult Intussusception - A Multicenter Retrospective Analysis

PURPOSE

 To evaluate the use of ultrasound (US) in the diagnostic work-up of adult intussusception (AI).

METHODS

 This multicenter study includes 26 consecutive patients diagnosed with AI between January 2010 and November 2017. A retrospective chart analysis was conducted with a focus on abdominal US findings and diagnostic accuracy of different imaging modalities (ultrasound, computed tomography (CT), magnetic resonance imaging). If available, surgical and pathological findings served as the gold standard (76.9 %). US examiners certified according to DEGUM grade 2 or 3 were classified as experts. Otherwise, they were regarded to have basic skills.

RESULTS

 During diagnostic work-up, 92.3 % underwent abdominal US. US was the first-line imaging modality in 88.5 % of cases. The accuracy regarding the detection of AI (85 %), correct localization (95 %) and detection of complications (100 %) was excellent and comparable with CT (81 %, 90.5 %, and 91.7 %) when performed by experts. 72.7 % of tumorous lead points were detected by experienced examiners. In contrast, AI was detected in only 45.5 % of cases by examiners with basic skills. AI was diagnosed prior to surgery in all patients.

CONCLUSION

 US is reliable in the diagnostic work-up of AI when performed by experienced examiners with high-quality equipment. US, CT and MRI should be used in a complementary fashion since combination provides excellent sensitivity regarding the detection and correct localization of AI as well as the detection of complications. The impact of real-time imaging is illustrated by supplementary videos.

Ileo-ileal intussusception caused by small bowel leiomyosarcoma: A rare case report

INTRODUCTION

Intussusception is the telescoping of one segment of the bowel into an adjacent bowel segment, causing venous congestion, edema, and blood supply reduction. We present a case of ileo-ileal intussusception in an adult patient with intestinal obstruction caused by a rare mesenchymal malignant lesion of the distal ileum: Leiomyosarcoma (LMS).

PRESENTATION OF CASE

A 90-year-old Caucasian man presented to the hospital with a two-day history of abdominal pain, nausea, and bowel occlusion. Preoperative Computer Tomography (CT) showed a solid mass with stratified walls in the lumen of the cecum with the classics "bulls-eye" appearance with concentric rings, suggestive of intussusception. The patient underwent emergency laparotomy with evidence of a small bowel wall tumor driving ileo-ileal intussusception with ischemic damage. Ileocecal resection was performed without postoperative complications. Histopathological examination showed a tumor on the muscular layer of the small bowel. The definitive diagnosis was LMS.

DISCUSSION

Adult intussusception is a rare condition, with an incidence of 2/1 000 000 cases per year worldwide. About 60% of patients suffering from this disease require surgery. Clinical presentation can be non-specific because of its no characteristic signs and symptoms. The most common presenting symptom is abdominal pain with bowel obstruction sings. Intussusception can occur anywhere along the small and large intestine and it is typically associated with a Lead Point (LP). The LP may be benign or malignant conditions. Infrequent malignant causes include LMS.

CONCLUSION

Diagnosis of intussusception is relatively challenging because of its non-specific symptoms. CT scan is the examimation of choice for the diagnosis because of its peculiar images. In adults, surgical treatment is recommended with laparoscopic or open approach according to surgeon expertise, sometimes in an emergency setting.

Adult Ileocolic Intussusception Caused by Diffuse Large B Cell Lymphoma

Intussusception is a medical condition, in which a proximal part of the intestine folds into the distal intestine. Adult intussusceptions are rare and account for approximately 5% of all cases of intussusceptions. The anatomical leading points include tumors, diverticulums, polyps, and strictures in 80-90% of adult intussusceptions, and 65% of colon intussusceptions and 30% of small bowel intussusceptions originate from malignant tumors. Treatments for adult intussusception have not been established, but most cases require surgical treatment. The gastrointestinal tract is the most common extranodal site for non-Hodgkin lymphoma. The symptoms are mostly non-specific, but they rarely lead to complications, such as bleeding, perforation, and intussusception. Furthermore, few cases of primary gastrointestinal lymphomas causing intussusception have been reported. This paper reports a case of small bowel diffuse large B cell lymphoma that caused ileocolic intussusception in a 69-year-old woman with no medical history. She underwent a small bowel resection and received six cycles of adjuvant chemotherapy with rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone. Since then, she has been in complete remission.

Ileocolic invagination in adults: A totally minimally invasive endoscopic and laparoscopic staged approach

Adult intussusception of the bowel is a rare clinical entity, and its management remains debated. The timing of treatment is not yet standardised, and no guidelines exist. We report a case of an 83-year-old woman presenting to the emergency department of our hospital with a history of increasing abdominal pain in the right iliac fossa. A contrast-enhanced computed tomography scan showed the presence of a large ileocolic intussusception with evidence of the terminal ileus invaginated within the right colon and the ileocolic vessels dragged and trapped into the intussusception. A colonoscopy confirmed the ileocolic invagination with a large right colonic lesion as leading point, and a partial pneumatic (carbon dioxide) and hydrostatic reduction was achieved. Subsequent laparoscopic right colectomy was performed according to oncological principles. A totally minimally invasive approach of this rare condition has been achieved but the literature lacks about the correct management of this entity.

Adult Ileocolic Intussusception from the Appendix

Intussusception is more commonly considered in the pediatric patient with abdominal pain, but can occur in adults as well. Adult patients are more likely to have an underlying intra-abdominal pathology leading to the condition. We present an adult patient presenting with abdominal pain with ileocecal intussusception diagnosed on imaging and confirmed surgically. In this case, appendiceal pathology served as the lead point for the intussusception.

Adult with intestinal malrotation and colocolic intussusception: an unusual combo

Intestinal malrotation is a congenital anomaly that results from an abnormality in the rotation and fixation of the gut as it returns to the abdominal cavity during development. Intussusception is a condition characterised by telescoping of one segment of the bowel into another segment. The combination of malrotation and intussusception is frequently a cause of intestinal obstruction in the paediatric age group. The coexistence of these two conditions is termed as Waugh syndrome and is uncommon in adults. We share our experience with an elderly woman who was admitted with diarrhoea and anaemia. Investigations revealed a large colonic polyp, colocolic intussusception and malrotation. The adenomatous polyp and mobile right colon would have lead to intussusception. The diagnosis was based on the findings of colonoscopy and contrast-enhanced CT scan of the abdomen. She was managed with a transverse colectomy with an uneventful recovery.

Missed case of intussusception, a rare cause of abdominal pain in adults: A case report emphasizing the imaging findings and review of the literature

Intussusception, a process whereby a segment of the intestine telescopes into the adjoining intestinal lumen, is a rare source of pain in adults that present with nonspecific abdominal pain. Imaging is the mainstay for diagnosis, which requires prompt and accurate interpretation to prevent complications. The following report details the misdiagnosis of intussusception in a 54-year-old male, whom presented to the emergency department with a 4-day history of nonrelenting abdominal pain, nausea, vomiting, and constipation. Following blood tests, chest, and abdominal imaging, the patient was discharged with a suspected passed renal stone. He soon represented to the General Practitioner, however, with equivalent pain; prompting a review of the images. It was apparent that the initial radiologist failed to recognize the subtle presence of intussusception. This case highlights the necessary consideration of intussusception as a differential diagnosis in adult patients presenting with intermittent abdominal pain. The case further emphasizes that radiologists should be familiar with the subtler signs of intussusception.

Jejunal Intussusception: A Rare Adult Presentation of Lymphoid Hyperplasia

A 21-year-old African-American male presented to the emergency room with a sudden diffuse onset abdominal pain of one day duration. CT findings revealed mild telescoping of loops of small bowel and mesenteric fat in the left mid abdomen with no apparent masses. The patient underwent an exploratory laparoscopy revealing intussusception of the mid jejunum. As a fair amount of distention compromised safe navigation of the bowel, laparoscopic resection was not warranted at this time. Open approach allowed for segmental resection of the affected segment of the small bowel. This was followed by primary anastomosis. Pathological findings revealed focal reactive lymphoid hyperplasia with marked congestion in the lamina propria of the jejunum. The patient had an unremarkable postoperative period and recovered with no further complications.

Dual-phase computed tomography angiography of intestinal carcinoid tumor as a lead point for cecocolic intussusception in a dog

In an 8-year-old Labrador Retriever with progressive anorexia, constipation, and depression, CT revealed intussusception of the cecum into the ascending colon and a small cecal mass showing strong enhancement on arterial phase. The ileocecocolic junction was surgically resected and histologically diagnosed as cecocolic intussusception with carcinoid tumor. The carcinoid tumor worked as a lead point of intussusception in this case. Dual phasic CT is useful to assess the presence of gastrointestinal tumors as lead points in old dogs with intussusception.

Intussusception after Colonoscopy: A Case Report and Review of Literature

Intussusception after colonoscopy is an unusual complication. A MEDLINE search revealed only 7 reported cases. We present a report of a 28-year-old man who developed abdominal pain several hours after routine colonoscopy and in whom computed tomography (CT) revealed colocolic intussusception. We postulate that this condition is iatrogenic and induced by suctioning of gas on withdrawal of the colonoscope. A common observation among the reported cases was abdominal pain several hours after colonoscopy and right-sided intussusception. All cases had colonoscopy reaching the right side of the colon. Treatment for adult intussusception remains controversial with regard to reduction versus resection, especially given the high association with a pathological cause and malignancy. Among the 8 reported cases, only the current case did not require surgery. A combination of benign colonoscopy, CT, and the clinical picture should provide sufficient information to initially choose a more conservative treatment approach.

Gastrointestinal hemorrhage caused by adult intussusception secondary to small intestinal tumors: Two case reports

RATIONALE

Adult intussusception is rarely observed, and the clinical manifestations are very atypical. The most common symptom is abdominal pain, while the incidence of hematochezia is relatively low. We report two cases of adult intussusception secondary to small intestinal tumors with gastrointestinal hemorrhage as the main symptom.

PATIENT CONCERNS

Two men aged 19 and 54 years were successively referred to our department due to intermittent hematochezia. The hemoglobin levels of the two patients declined progressively, and conservative treatment was ineffective.

DIAGNOSES

The first patient underwent an abdominal computed tomography angiography examination, which showed that the intestine and its mesentery were tortuous, suggesting an intra-abdominal hernia or intussusception. The second patient underwent an abdominal computed tomography examination, which suggested a high possibility of an intussusception. The two patients were diagnosed as adult intussusception caused by small intestinal tumors.

INTERVENTIONS

Emergency laparoscopic explorations were performed. Enteroenteric intussusceptions caused by ileal tumors were found during surgery. Reduction of the intussusceptions and resection of the ileal tumors were performed.

OUTCOMES

The patients recovered well after surgery, and postoperative pathology showed that the tumors were a vascular hamartoma polyp and a lipoma.

LESSONS

Adult intussusception is very rare, particularly with gastrointestinal hemorrhage as the main symptom. Isolated hamartoma polyp is a rare cause of intussusception in adults. The clinical manifestations of adult intussusception are very atypical, and thus, making a preoperative diagnosis is difficult. Abdominal CT or CTA is an effective diagnostic method for adult intussusception. For adult patients with gastrointestinal hemorrhage caused by intussusceptions, active surgery should be performed when conservative treatment is not effective. Laparoscopic surgery is a safe and effective treatment for adult intussusceptions caused by benign diseases.

Core curriculum illustration: colonic intussusception due to pedunculated lipoma

This is the 48th installment of a series that will highlight one case per publication issue from the bank of cases available online as a part of the American Society of Emergency Radiology (ASER) educational resources. Our goal is to generate more interest in and use of our online materials. To view more cases online, please visit the ASER Core Curriculum and Recommendations for study online at http://www.aseronline.org/curriculum/toc.htm .

Appendiceal intussusception in the setting of ulcerative colitis

Appendiceal intussusception is a very rare condition with an estimated incidence of 0.01%. Most cases present in adults with chronic waxing and waning of symptoms over a period of weeks to months. We report a case of a 39-year-old Caucasian female with a 5-week history of worsening right-sided abdominal pain. Computed tomography revealed cecal thickening without visualization of the appendix. A colonoscopy revealed mild diffuse erythema and edema in the ascending colon as well as a mass within the lumen of the cecum. Biopsies of the colon were suggestive of mild ulcerative colitis (UC). The patient's symptoms continued and laparoscopic assisted ileocecectomy was performed revealing an inverted appendix protruding into the cecal lumen. The patient was discharged without any complications and began mesalamine therapy for her UC.

Unusual Presentation of Duodenal Ulcer Presenting with Duodenal Intussusception

We present a unique case of duodeno-duodenal intussusception from a duodenal bulb ulcer. A 38-year-old man presented with nausea, vomiting, and abdominal pain. Computed tomography showed duodenal intussusception. Esophagogastroduodenoscopy (EGD) showed a linear gastric ulcer and a duodenal bulb ulcer with an overlying blood clot. Helicobacter pylori status was positive. Intussusception resolved spontaneously without intervention. He completed treatment for H. pylori infection, and repeat EGD showed ulcer healing. Duodenal intussusception is rarely reported; intussusception from an edematous duodenal ulcer with an overlying blood clot mimicking a mass lesion acting as lead point has never been reported to our knowledge.

Contribution of the virtual colonoscopy in a case of intestinal intussusception

The present paper describes a case of ileocecal intussusception detected by ultrasound and confirmed by CT, including the imaging characteristics allowing its diagnosis. The patient was referred for colonoscopy, which could not be completed, to assess the cause of intussusception. Then it was decided to resort to Virtual colonoscopy, which allowed to identify and characterize a cecal neoplasm serving as a lead point for the intussusception.

A Clinical Scoring System to Predict the Clinical Sequelae of Computed Tomography Diagnosed Intussusception

INTRODUCTION

Intussusception in adults is increasingly diagnosed on cross-sectional imaging with a lack of clear recommendations on management. The presence of an underlying lead point is a key to guiding management as its absence can predict spontaneous resolution. We studied adult patients with computed tomography (CT) diagnosed intussusception formulate a clinical scoring system to predict the risk of an underlying lead point.

METHODOLOGY

We performed a retrospective review of all adult patients who underwent CT scans of the abdomen and pelvis in our institution between 2001 and 2014. Independent associations of an underlying lead point were derived following multivariable analysis, from which a clinical scoring system was developed.

RESULTS

We studied 140 patients. In multivariable analysis, six factors were found to be independently associated with the presence of an underlying lead point, namely gender, abdominal pain, CT evidence of colonic involvement, CT evidence of a lead point, distal diameter ≥27 mm and minimum wall thickness ≥3 mm. A nine-point clinical scoring system was developed, with a cutoff score of four or higher yielding a sensitivity and specificity of 0.75 and 0.81, respectively.

CONCLUSION

Our clinical scoring system provides a quantitative tool to predict the likelihood of an underlying lead point in CT-diagnosed intussusception in adults to help guide management.

Disease- and Treatment-related Complication on F-18-Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography in Oncology Practice: A Pictorial Review

F-18-fluorodeoxyglucose positron emission tomography/computed tomography (PET/CT) is routinely performed in oncology patients for various indications including staging, restaging, recurrence detection, and treatment response evaluation. Many disease- and treatment-related complications can be incidentally detected on PET/CT, which may be due to the complication of radiotherapy, chemotherapy, intervention, or primary tumor itself. Some of these complications could be life threatening and need urgent intervention. Therefore, these incidental findings should be recognized on PET/CT and immediately informed to the treating physicians if required urgent intervention.

Small bowel intussusception in 2 adults caused by inflammatory polyps

Inflammatory fibroid polyps are rare, benign pseudotumors of the gastrointestinal tract of unknown etiology, which may rarely present as bowel intussusception and obstruction. The authors describe the clinical, radiologic, and pathologic features of 2 patients with ileal inflammatory fibroid polyps presenting as small bowel intussusception.

Imaging of Uncommon Causes of Large-Bowel Obstruction

OBJECTIVE

The most common causes of large-bowel obstruction (LBO) are colon carcinoma and volvulus. Nevertheless, the increased frequency of the condition and widespread use of diagnostic imaging have revealed uncommon causes of LBO. We review the imaging features of the unusual causes of LBO on several imaging modalities, with particular emphasis on CT, along with the current literature.

CONCLUSION

We propose an algorithmic approach to the radiologic evaluation of the uncommon causes of LBO.

Transient Descending Colocolonic Intussusception Due to a Large Fecaloma in an Adult

Intussusception typically occurs in infants and children, with adults representing 5% of cases. A 53-year-old African American woman presented with lower abdominal pain and tenderness. Computed tomography of the abdomen and pelvis demonstrated a 3.5 cm colocolonic intussusception in the descending colon. Emergent colonoscopy found solid stool in the mid descending colon. Water-soluble rectal enema showed a filling defect in the mid descending colon. Repeat colonoscopy demonstrated presence of a large fecaloma in left colon. Laxatives were initiated, and abdominal pain subsided. To our knowledge, this is the first report of colocolonic intussusception secondary to fecaloma.

Ileo-ileal intussusception of a sutured enterotomy site, 6days after laparotomy due to fetobezoar: A case report

INTRODUCTION

Postoperative small bowel obstruction due to intussusception is a rare entity but can lead to severe morbidity and even mortality. We present a case of this rare complication produced by an unusual cause.

CASE REPORT

A 22year old male, who is a fruitarian, presented to the E.R on day 6 after laparotomy due to obstructing fetobezors that were removed via gastrotomy and enterotomy. In his readmission, he had severe, diffuse abdominal pain, distended abdomen and diffuse peritonitis. Abdominal computed tomography (CT) showed a large amount of fluid in the abdomen, distended small bowel loops, a small amount of free air around the stomach and a suspected ileo-ileal intussusception. The patient underwent emergent laparotomy which revealed an ileo-ileal intussusception with the sutured enterotomy site from the previous operation as the lead point. In addition, a minor dehiscence of the gastrotomy site was identified. A reduction of the intussusception was performed with resection of the enterotomy site and side to side anastomosis. The gastrotomy site was debrided and re-sutured. Recovery was uneventful.

CONCLUSION

Postoperative intussusception, although rare, is potentially a dangerous complication, often not involving the site of the primary operation. To our knowledge this is the first report of an intussusception with a sutured enterotomy site as the lead point. Clinicians should be aware of this entity when assessing a patient with abdominal pain and distention after surgery with enterotomy or resection of bowel.

Neuroendocrine carcinoma as a rare cause of jejunal intussusception in an adult. Management and literature review

Intussusception of the small bowel is an uncommon condition, with the majority of cases being observed during infancy. A number of points are responsible, with benign and malignant lesions of the small intestine being the most common. Herein, we present the case of a 75-year-old male patient with vague abdominal pain and black stool during defecation, who underwent surgery due to jejunal intussusception. Pathology report demonstrated a neuroendocrine carcinoma as the underlying cause for his condition, with no additional metastases during the initial diagnosis. Although a conservative approach for management of intussusception is viable, the possibility of gastric outlet obstruction and the presence of malignancy as the primary point usually lead to urgent surgery. In the case of malignancy, adjuvant chemotherapy or additional symptomatic therapy with close follow-up may be required depending on tumor's grade and aggressiveness.

Burkitt lymphoma as a lead point for jejunojejunal intussusception in a human immunodeficiency virus patient

Intussusception is commonly seen in children but is rare in adults and represents only 5% of all intussusceptions causing 1% of intestinal obstructions. More than 50% of these intussusceptions in adults are due to intestinal neoplasms, including malignant lymphoma, e.g., Burkitt lymphoma. These lymphomas are more common in human immunodeficiency virus (HIV)-positive patients than in the general population. We present a case of a young male who was diagnosed with HIV when he developed intestinal obstruction and intussusception secondary to Burkitt lymphoma. He was managed with surgical resection followed by chemotherapy and antiretroviral treatment. HIV patients presenting with acute abdomen pose a diagnostic challenge to clinicians due to a wide range of differential diagnoses including inflammatory, infectious and neoplastic conditions. In a young HIV patient presenting with acute abdomen, intussusception caused by Burkitt lymphoma should be considered in the differential.

Adult intussusception: A case series and review

AIM

To identify factors differentiating pathologic adult intussusception (AI) from benign causes and the need for an operative intervention. Current evidence available from the literature is discussed.

METHODS

This is a case series of eleven patients over the age of 18 and a surgical consultation for "Intussusception" at a single veteran's hospital over a five-year period (2011-2016). AI was diagnosed on computed tomography (CT) scan and or flexible endoscopy (colonoscopy). Surgical referrals were from the emergency room, endoscopy suites and the radiologists.

RESULTS

A total of 11 cases, 9 males and 2 females were diagnosed with AI. Median age was 58 years. Abdominal pain and change in bowel habits were most common symptoms. CT scan and or colonoscopy diagnosed AI, in ten/eleven (90%) patients. There were 6 small bowel-small bowel, 4 ileocecal, and 1 sigmoid-rectal AI. 8 patients (72%) needed an operation. Bowel resection was required and definitive pathology was diagnosed in 7 patients (63%). Five patients had malignant and 2 patients had benign etiology. Small bowel enteroscopy excluded pathology in 4 cases (37%) with AI. Younger patients tend to have a benign diagnosis.

CONCLUSION

Majority of AI have malignant etiology however idiopathic intussusception is being seen more frequently. Operative intervention remains the mainstay however, certain small bowel intussusception especially in younger patients may be a benign, physiological, transient phenomenon and laparoscopy with reduction or watchful waiting may be an acceptable strategy. These patients should undergo endoscopic or capsule endoscopy to exclude intrinsic luminal lesions.