Antimesenteric Border Research Articles

Development and Validation of a Realistic Neonatal Intestinal Jejunoileal Atresia Simulator for the Training of Pediatric Surgeons.

Background: Neonatal surgical pathology presents highly technical complexity and few opportunities for training. Many of the neonatal surgical entities are not replicable in animal models. Realistic 3D models are a cost-effective and efficient alternative for training new generations of pediatric surgeons. Methods: We conceptualized, designed, and produced an anatomically realistic model for the open correction of jejunoileal atresia. We validated it with two groups of participants (experts and non-experts) through face, construct, and content validity questionnaires. Results: The model was validated by eleven experts and nine non-experts. The mean procedure time for the experts and non-experts groups was 41 and 42 min, respectively. Six non-experts and one expert did not complete the procedure by the designed time (45 min) (p = 0.02). The mean score of face validity was 3.1 out of 4. Regarding construct validity, we found statistically significant differences between groups for the correct calculation of the section length of the antimesenteric border (Nixon's technique) (p < 0.01). Concerning content validity, the mean score was 3.3 out of 4 in the experts group and 3.4 out of 4 in the non-experts group. Conclusions: The present model is a realistic and low-cost valid option for training for open correction of jejunoileal atresia. Before drawing definitive conclusions, future studies with larger sample sizes and blinded validators are needed.

Management of Strangulated Richter’s Hernia in a Resource-Limited Setting: Report of Two Cases and Literature Review

Richter’s hernia is a rare type of abdominal wall hernia characterized by high morbidity and mortality. It occurs when the anti-mesenteric border of the bowel is partially trapped in a tight hernial ring. The femoral ring is the most common site, with the ileum being the most frequently involved intestinal segment. However, the advent of laparoscopic surgery has introduced another potential site for Richter’s hernia formation. In our region, this pathological entity is exceptionally diagnosed due to limited access to abdominal imaging and delayed management. Additionally, the wide variety of clinical manifestations resulting from incomplete intestinal obstruction makes it particularly difficult to diagnose. Consequently, it is usually identified during surgery. We present here the case of two adult patients (a 33-yeairs-old woman and a 59-year-old man), the first with a history of surgical procedures and the second with a spontaneously reducible painless inguinal swelling. They were transferred to the surgical emergency department for an acute abdomen with abdominal distension and cessation of matter and gas. Clinical and paraclinical examinations (including hydroaeric level on abdominal X-ray) indicated mechanical intestinal obstruction. Emergency laparotomy, necessitated by the unavailability of abdominal computed tomography due to financial constraints, confirmed the diagnosis of Richter's hernia, with the first case located in the right inguinal region and the second in the linea alba. Surgical management involved reduction of the hernia contents and suture repair in both cases. Despite requiring bowel resection in the second patient, the postoperative course was straightforward. These two rare cases highlight that emergency exploratory laparotomy is the cornerstone of Richter hernia management in resource-limited conditions.

Secondary Epiploic Appendagitis – Report of Three Cases with CT Findings

ABSTRACT Epiploic appendages are the fat-containing peritoneal pouches usually seen in the anti-mesenteric border, adjacent to the large bowel loop. The major components are adipose tissue and vessels. The exact functions are not understood. Epiploic appendagitis (EA) is an inflammatory process, primarily may be due to torsion or vascular occlusion or may be secondarily related to other inflammatory processes. Symptoms vary from mild abdominal pain to severe variety, depending on the underlying cause. Primary EA is a benign self-limiting condition and does not require any surgical intervention, whereas secondary cause of inflammation needs management of underlying pathology. Proper diagnosis plays a vital role in appropriate management. Cross-sectional study like computed tomography (CT) is the ideal choice of imaging. On CT, epiploic appendigitis appears as round to oval fat-attenuating lesions with hyperattenuating peripheral rim, usually abutting the adjacent large bowel. Chronic inflammation shows peripheral calcification, may detach, and appears as intra-abdominal loose body. We describe three cases of secondary EA with CT imaging features, which will guide the clinician in proper management, avoiding unwarranted surgery or hospitalization.

Use of jejunal serosal patch and pyloric exclusion in the management of complex duodenal injury.

Duodenal injuries are relatively rare but remain a management challenge with a high incidence of postoperative complications. Guidelines from the World Society of Emergency Surgery and American Association for the Surgery of Trauma favour a primary repair for less-complex injuries, but the management of more complex duodenal trauma remains controversial with varying techniques supported, including pyloric exclusion, omental or jejunal patch closure, gastrojejunostomy and pancreatoduodenectomy. We describe the techniques used in one case of complex duodenal trauma. The duodenum is approached via a standard laparotomy with Kocherisation. Primary repair of the duodenal perforations is performed using a 3/0 polydioxanone suture (PDS), followed by mobilisation of a loop of mid-jejunum against the area of duodenal trauma over the primary repair as a jejunal serosal patch. The antimesenteric jejunal serosal border is sutured to the serosa of the duodenum (serosa only) using a 3/0 PDS. Pyloric exclusion is then performed through an anterior gastrostomy, to control the volume of gastric juice entering the duodenum. The pylorus is sutured closed using an absorbable suture followed by closure of the anterior gastrostomy using a GIA stapling device.

A rare presentation of jejunal GIST: A case report

Gastrointestinal stromal tumors (GISTs) are rare tumors that constitute 1% of all GI tract tumors. Jejunal GISTs are the rarest subtype. We present a middle-aged gentleman, who presented with pain in the right lower abdomen. On abdominal examination, a lump was palpable in the right iliac fossa (RIF). Contrast-enhanced computed tomography of the abdomen revealed an extraluminal soft-tissue mass in the ileum. Computed Tomography-guided core needle biopsy from the lump was consistent with GIST, which was confirmed on immunohistochemistry. Mutation analysis revealed exon 11 mutations. Due to the proximity of GIST to the rectum and urinary bladder, the patient was started on imatinib therapy. After 3 months of treatment, imatinib therapy had to be stopped due to skin reactions. Restaging was done with a positron-emission tomography scan, which demonstrated a soft-tissue mass likely arising from the ileocecal region in the RIF abutting the ascending colon without any significant decrease in size. On exploration, a well-circumscribed mobile extraluminal lobulated mass was seen arising from the antimesenteric border of the jejunum. Histopathologic examination showed GIST, which was confirmed on immunohistochemistry. We report this case to emphasize keeping small bowel GIST as an unusual differential diagnosis of a RIF lump. Furthermore, not all patients can tolerate imatinib treatment, hence exon mutation study is important, and surgery should be considered if it is deemed resectable.

Giant colonic diverticulum of the transverse colon as a rare cause of surgical acute abdomen: A case report

A colonic diverticulum larger than 4 cm in size is referred to as a giant colonic diverticulum and is an uncommon occurrence. Globally, &lt;200 cases of large colonic diverticula have been documented. The majority of the giant colon diverticulum arises from the sigmoid colon. However, we here described a case report of a 68-year-old female who presented with acute abdominal pain, along with chronic constipation. An abdominal computed tomography scan revealed an enormous giant colonic diverticulum measuring 17 cm × 11.7 cm × 7.8 cm with a 1.3 cm neck orifice, arising from the transverse colon along the antimesenteric border of the colon. The patient underwent an exploratory laparotomy with excision of the transverse colonic giant diverticulum and stapler anastomosis.

Effect of carboxymethyl cellulose, icodextrin and hyaluronic acid solutions on postoperative intraabdominal adhesion formation in rabbits and the role of cytokines in intraabdominal adhesion formation

In this study, the aim was to investigate the effects of 1% CMC, 4% ICO and 0.4% HA solutions in preventing postoperative IAs and their contribution to peritoneal wound healing, as well as the relationship of cytokines with the formation of postoperative IAs in rabbits. The material of the study consisted of 32 healthy rabbits. Rabbits underwent median laparotomy following general anesthesia. Serosal abraded was created at the antimesenteric border of the cecum. Next, a 3 × 2 cm peritoneum was excised on the right abdominal wall and the defect was closed using with a 2/0 silk suture. The rabbits were randomly assigned to either of the following four treatment groups: CNT (0.9% NaCl), ICO (4% icodextrin), HA (0.4% hyaluronic acid) and CMC (1% carboxymethyl cellulose). Both cecum and peritoneal surfaces were treated with 20 ml each of treatment solutions. On the 7th postoperative day, the rabbits were euthanized with a lethal dose of sodium pentobarbital and the degree of adhesion was evaluated. Samples taken from the peritoneal defect were examined histopathologically and tissue hydroxyproline levels were measured. Serum TNF-α, IL-1 and IL-6 levels were measured from blood samples taken before the surgery and at 1, 6, 24 and 48 hours after the surgery. It was observed that the adhesion grade in the HA group (p &lt; 0.05) and CMC group (p &lt; 0.01) was significantly lower than the control group. Although peritoneal tissue hydroxyproline levels were lower in the other groups compared to the control group, they were not statistically significant (p &gt; 0.05). In rabbits with adhesion formation, it was determined that TNF-α levels increased at the 6th postoperative hour (p &lt; 0.05), and IL-6 levels increased at the 6th, 24th and 48th postoperative hours (p &lt; 0.001) compared to preoperative. In this study, treating tissues with 0.4% HA and 1% CMC solutions suppressed peritoneal inflammation, and this resulted in an increase in the levels of proinflammatory cytokines TNF-α and IL-6. It has been determined that the application of these solutions reduces postoperative adhesion formation. It was concluded that TNF-α and especially IL-6, which are proinflammatory cytokines, can be a non-invasive biomarker in determining postoperative IA formation and evaluating the adhesive process.

Robotic-assisted appendiceal onlay flap ureteroplasty combined with ureteral reimplantation for multifocal ureteral strictures: Case report and technical description.

To describe the surgical technique of robotic-assisted appendiceal onlay flap ureteroplasty combined with ureteral reimplantation to repair unilateral multifocal ureteral strictures in one stage and report 9-month follow-up outcomes. A longitudinal ventral incision of proximal ureter strictures No. 1 and 2 was performed, and the appendix was detubularised along its antimesenteric border. Then, the appendiceal onlay flap was anastomosed with the spatulated ureter in an onlay fashion. To manage the distal ureteral stricture No. 3, ureteral reimplantation was performed in a tension-free manner. Voiding cystourethrography and antegrade urography showed urine regurgitation into the ureter without dilation and no obstruction of the reconstructed ureteral segment 7weeks after surgery. No postoperative complications occurred during the 9-month follow-up. Robotic-assisted appendiceal onlay flap ureteroplasty combined with ureteral reimplantation appears to be a safe and effective surgical method for repairing the unilateral multifocal ureteral strictures.

Real-time quantification of bowel perfusion using Laparoscopic Laser Speckle Contrast Imaging (LSCI) in a porcine model

Background/purposeReal-time quantification of tissue perfusion can improve intraoperative surgical decision making. Here we demonstrate the utility of Laser Speckle Contrast Imaging as an intra-operative tool that quantifies real-time regional differences in intestinal perfusion and distinguishes ischemic changes resulting from arterial/venous obstruction.MethodsPorcine models (n = 3) consisted of selectively devascularized small bowel loops that were used to measure the perfusion responses under conditions of control/no vascular occlusion, arterial inflow occlusion, and venous outflow occlusion using laser speckle imaging and indocyanine green fluoroscopy. Laser Speckle was also used to assess perfusion differences between small bowel antimesenteric-antimesenteric and mesenteric-mesenteric anastomoses. Perfusion quantification was measured in relative perfusion units calculated from the laser speckle perfusion heatmap.ResultsLaser Speckle distinguished between visually identified perfused, watershed, and ischemic intestinal segments with both color heatmap and quantification (p < .00001). It detected a continuous gradient of relative intestinal perfusion as a function of distance from the stapled ischemic bowel edge. Strong positive linear correlation between relative perfusion units and changes in mean arterial pressure resulting from both arterial (R2 = .96/.79) and venous pressure changes (R2 = .86/.96) was observed. Furthermore, Laser Speckle showed that the antimesenteric anastomosis had a higher perfusion than mesenteric anastomosis (p < 0.01).ConclusionsLaser Speckle Contrast Imaging provides objective, quantifiable tissue perfusion information in both color heatmap and relative numerical units. Laser Speckle can detect spatial/temporal differences in perfusion between antimesenteric and mesenteric borders of a bowel segment and precisely detect perfusion changes induced by progressive arterial/venous occlusions in real-time.

Femoral Hernia Presenting as Richter’s Variant: A Rare Case Report

Background: Richter's hernia occurs when a portion of the anti-mesenteric border of a bowel wall is captured within the hernia sac, resulting in ischaemia, gangrene, and perforation. Only part of the circumference of the bowel wall is involved in Richter's hernia, which causes strangulation without obstruction. Femoral hernia presenting as a Richter’s hernia is rare. Aim: This is to report a case of Richter’s hernia in a femoral hernia occurring in an adult female. Case Report: In this case, a 62-year-old woman presented with a history of sudden generalized abdominal pain. Before the presentation, she had a six-year history of reducible left inguino-labial swelling that became irreducible two weeks ago. Pallor was present. Her temperature was 39.2°C, her pulse rate was 112 per minute, and her blood pressure was 132/62 mmHg. A diagnosis of a left femoral hernia was made. She was revived, and the groin swelling was explored through a midline incision over the abdomen. There was ischaemia of the anti-mesenteric border of the ileum, along with strangulated preperitoneal fat. The bowel vascularity over the anti-mesenteric border was doubtful, so a resection anastomosis of the segment of the bowel was done followed by a reduction of the bowel loop and herniorraphy. Conclusion: It is rare for a femoral hernia to present with a Richter's hernia, but it can happen even in the absence of obstructive symptoms. Any time there is groin swelling, it is important to get a quick, correct diagnosis and treatment. If there is a delay in identification and treatment, a spontaneous faecal fistula, an uncommon complication, may develop. The relevant authorities must address this as it reflects the status of healthcare in the developing world.

Incidentally Detected Meckel Diverticulum during Cystectomy: An Unhinging Dilemma?

Meckel's diverticulum is found in 2% of the population, which makes it the commonest congenital abnormality of the gastrointestinal tract. It is diagnosed as an incidental finding during surgery for other reasons. It is found 100 cm from the ileocecal junction, at the antimesenteric border. Other presentations can be abdominal pain, infection, bleeding from ectopic mucosa, recurrent intestinal obstruction, etc. It is formed during the embryonic period due to incomplete obliteration of the omphalomesenteric duct. Treatment of this complication is the removal of Meckel's diverticulum.[1] [2]

SMALL BOWEL OBSTRUCTION DUE TO MECKELS DIVERTICULUM: A CASE REPORT

Meckels diverticulum is the most common congenital anomaly of the small intestine. It results from incomplete obliteration of the vitelline duct leading to the formation of a true diverticulum of the small intestine which is usually located on the antimesenteric border of the ileum. This case report presents the diagnosis and management of a small bowel obstruction due to Meckels diverticulum in a 70-year-old patient. To identify the cause of the small bowel obstruction, The patient underwent computed tomography (CT) scan of her abdomen and pelvis which showed mild dilatation of the small bowels, particularly in the distal jejunum and proximal ileum with no transition point was seen on the CT scan. During the laparotomy, it was revealed a gross distension of the small bowel, and the distal portion of the ileum was markedly compressed by an internal hernia twisted around a giant Meckels diverticulum with a mesodiverticular artery in an area 50 cm from the tip of the ileum.

Small bowel gastrointestinal stromal tumor presenting as a life-threatening emergency

Gastrointestinal stromal tumor (GIST) is a rare stromal neoplasm, which represents the most common mesenchymal tumor of the gastrointestinal tract. It is characterized by indolent clinical symptoms, although it can present as a life-threatening emergency. Here in, we present a case of primary small bowel GIST treated at our department. A 58-year-old male patient presented to our emergency department with a diffuse abdominal pain of acute onset. Patient presented with symptoms and signs of acute intestinal obstruction. Imaging studies revealed a mass at mid ileum, with multiple air fluid levels. Intra-operatively, a mass of 12×9 cm was found at mid ileum on antimesenteric border with 3600 volvulus of adjacent ileum. En bloc resection was performed. Histopathology report was suggestive of gastrointestinal stromal tumor.

Torsed gangrenous Meckel’s diverticulum presenting as acute abdomen

Meckel’s diverticulum is the most commonly encountered congenital anomaly of the gastrointestinal tract. It usually arises from the antimesenteric border of the ileum. We report an unusual imaging finding of complicated Meckel’s and atypical imaging appearance of intussusception in which telescoping of segments is not evident on imaging.

Интестиноцистопластика при туберкулезном поражении мочевого пузыря.

Introduction. Genitourinary tuberculosis (GUTB) ranks second in the structure of extrapulmonary forms in Russian Federation. Reconstructive surgery for GUTB is required for cases with grossly distorted and dysfunctional anatomy that are unlikely to regress with chemotherapy alone. In the recent past, there has been a tremendous increase in the variety of reconstructive procedures for the urinary bladder, used in the management of GUTB. Materials and methods. The search, analysis and systematization of publications in the databases PubMed, Scopus, Web of Science, Google Scholar, e-Library.ru according to the following keywords «tuberculosis of the genitourinary system», «cystoplasty», «gastrocystoplasty», «ileocystoplasty», «cecocystoplasty», «iliocecocystoplasty», «sigmocystoplasty», «orthotopic non-bubble». As a result, 41 publications were selected to write the review. Results and discussion. Augmentation cystoplasty includes the goals of increasing bladder capacity, while retaining as much of bladder as possible. Various gastrointestinal segments have been used for bladder reconstruction. The choice of material for reconstruction is purely the surgeon's prerogative his skill, the ease, the mobility and length of mesentery (allowing bowel to reach the bladder neck without tension and maintaining an adequate blood supply). The presence or absence of concomitant reflux is of considerable importance. In the former, an ileocystoplasty with implantation of ureter to the proximal end of the isolated ileal loop and anastomosis of the distal end of the ileal loop to the bladder neck and trigone is advocated. In the latter case, the ureterovesical valve is preserved and colocystoplasty is preferred, wherein the sigmoid colon on being opened along its antimesenteric border is joined to the trigone and bladder neck and then to itself to form a capacious pouch. Gastrocystoplasty reduces the risk of acidosis but is associated with complications like hypochloremic alkalosis and «hematuria-dysuria» syndrome. Orthotopic neobladder reconstruction is a feasible option, suitable in cases of tubercular thimble bladder with a markedly reduced capacity (as little as 15 ml), where an augmentation alone may be associated with anastomotic narrowing or poor relief of symptoms. Conclusions. In this article, we review the various bladder reconstruction options used for the surgical management of GUTB, along with their indications and complications.

Intramural jejunal haematoma in an Arabian mare as a cause of colic: Clinical presentation, diagnosis and treatment

AbstractAn 11‐year‐old Arabian mare was presented to the Veterinary Teaching Hospital, Koret School of Veterinary Medicine because of acute colic. During exploratory laparotomy, a segment of the jejunum was found to be necrotic, with a haematoma on its antimesenteric border. The segment was removed via hand‐sewn resection and anastomosis, and the mare recovered successfully. Histopathology revealed intramural haematoma located in the tunica muscularis. Three years later, the mare is healthy, and is back to its intended use as a brood mare.

Deep Infiltrating Endometriosis Affecting Ileoanal Anastomosis (J-Pouch): Surgical Approach

<h3>Study Objective</h3> To review a patient case of deep infiltrating endometriosis of an ileoanal anastomosis. <h3>Design</h3> Case report. <h3>Setting</h3> Academic institution, Minimally Invasive Gynecologic Surgery and Colorectal combined procedure. <h3>Patients or Participants</h3> 38-year-old with history of ulcerative colitis status post ileoanal anastomosis (J-pouch) with deep infiltrating endometriosis. <h3>Interventions</h3> Robotic-assisted total laparoscopic hysterectomy with bilateral salpingectomy, left oophorectomy, excision of deep infiltrating endometriosis of J-pouch, ureteral ICG injection, and pouchoscopy. <h3>Measurements and Main Results</h3> Patients with endometriosis are at increased risk of co-morbid inflammatory bowel disease. Ileoanal anastomosis is indicated in patients with disease affecting the entire colon and rectum such as ulcerative colitis. The J-pouch is created with an anastomosis of folded terminal ileum following total resection of the colon and rectum. An enterotomy of the pouch and anal anastomosis are then completed, forgoing the need for ileostomy. The primary vascular supply consists of terminal branches of the superior mesenteric artery and is therefore limited. The patient presented with pain and on MRI was found to have deep infiltrating endometriosis of the ileoanal anastomosis approximating 3.2 by 1.0 cm, as well as a left endometrioma. Intra-operatively, the deep infiltrating lesion was identified on the efferent limb on the antimesenteric border of the J-pouch ileum and removed using a shave technique. Care is taken to avoid the vascular supply to the J-pouch on the mesenteric aspect, as no collateral supply is available. An omental pedicle flap was created and secured overlying the pouch to reduce the risk of fistula formation. The patient underwent the procedure without complications. <h3>Conclusion</h3> Patients with endometriosis are at increased risk of comorbid inflammatory bowel disease. Knowledge of J-pouch anatomy is crucial to dissection in cases of endometriosis involvement, including delicate blood supply. The use of an omental flap can be helpful to prevent formation of future adhesions. A multidisciplinary approach is key to patient care.

Rapunzel Syndrome: A Case of Trichobezoar with Small Bowel Complications

Introduction Rapunzel syndrome is characterized by a large trichobezoar in the stomach with a tail extending beyond the pylorus into the small bowel, causing mechanical obstruction of the small bowel. A 7-year-old girl presented to the emergency room with severe epigastric pain. Computed tomography suggested trichobezoar causing jejuno-jejunal intussusceptions, bowel wall thickening, and dilated small bowel loops proximal to the obstruction. On laparotomy, two concealed perforations were noted at the duodenojejunal (DJ) junction and 40 cm distal to the DJ junction. An enterotomy incision was given at the antimesenteric border of the distal jejunal perforation site, and the mass was successfully extracted. Primary repair was done at the DJ perforation site, and resection was followed by an end-to-end anastomosis at the distal jejunal perforation site. Surgery confirmed a complex mass of tangled hair within the gastric cavity with a tail extending into the pylorus of the stomach and small intestine, consistent with trichobezoar. Conclusion Computed tomography is superior to other radiological imaging modalities for diagnosing trichobezoars as it helps diagnose and demonstrate mechanical bowel complications.

MECKELS DIVERTICULUM WITH MESENTERY AS A RARE CAUSE OF CLOSED LOOP OBSTRUCTION-A CASE REPORT

Meckel's Diverticulum is most common congenital anomaly of gastrointestinal tract. It arises from Antimesenteric border of the small bowel [1]. In contradiction, a case encountered at our institution where a 32-y old female presented with complaints of pain abdomen since 3 days, vomiting's since 3 days, obstipation since 3 days and distention since 1 day. On examination abdomen is distended, diffuse tenderness present all over the abdomen with no bowel sounds and collapsed rectum with no fecal staining per rectally. Imaging studies on ultra-sonography shown dilated small bowel loops with max diameter of 3.1cm showing to and fro peristalsis. On CT abdomen multiple dilated small bowel loops with air uid levels with maximum diameter of 4.1cms with collapsed terminal ileum and large bowel. ?Closed Loop Obstruction. Emergency exploratory laparotomy was planned and shown Meckel's diverticulum with mesentery present on anti-mesenteric border with mesentery extending from mesenteric border to tip of Meckel's diverticulum with internal herniation of proximal ileum between the Meckel's and its mesentery causing closed loop obstruction noted at 60cms from IC junction for which herniated bowel loops was released with diverticulectomy followed by anastomoses of proximal and distal ileal loops. Resected Meckel's sent for histopathological examination and cut section showed mucosa, sub-mucosa, muscularis propria and serosa. Mucosa shows chronic nonspecic inammation, sections from the adjacent area's shows hyperplastic mucosa, hypertrophied muscularis layers and serosa with congested blood vessels with feature's consistent with Meckel's diverticulum. Patient was followed for 6 months, and the course was un-eventful.

Femoral Richter Hernia: A Case Report and Literature Review

Richter hernia is defined as a partial hernial strangulation of the small bowel anti-mesenteric border. This clinical form has important diagnostic particularities such as a significant risk of intestinal necrosis and an absence of intestinal obstruction signs or palpable parietal mass. We report a case of a 72-year-old patient, gravida 6, and para 6 who consulted for abdominal pain evolving for 48 hours. An abdominal CT scan with contrast injection visualized a strangulated right femoral hernia containing the antimesenteric border of a small bowel part creating a Richter hernia confirmed by surgical exploration through an oblique inguinal incision. A McVay repair was performed. The postoperative course was uneventful. Richter's femoral hernia is a particular anatomic and clinical entity and represents a diagnostic challenge. A complete clinical examination is important to avoid diagnostic delay and the occurrence of complications. The treatment is surgical according to the contamination of the surgical field. Keywords: CT scan, Femoral, Hernia, Necrosis, Richter