The left mesentero-parietal hernia, also called left paraduodenal hernia, is an exceptional form of intestinal rotation anomalies. It is the most common type of internal abdominal hernia. It represents 50% to 55% of all intestinal hernias. In addition, 80% of them would be observed on the left side . The occlusion mechanism is an intestinal fold at the hernial neck, without ischemia . Most often, its clinical picture is a digestive symptomatology with a type of incomplete high occlusion usually recurrent. This symptomatology can continue during a few months, even a few years and up to childhood in certain cases thus favoring a diagnostic wandering with risks of complications. In all cases, despite the potential seriousness of these complications, the prognosis remains better due to the localized nature of intestinal ischemia. We report a case of mesenterico-parietal hernia associated with non-ischemic small bowel volvulus.
A 5-year-old boy, admitted for sudden onset of abdominal pain associated with bilious vomiting, matters and gases cessation, lasting for 4 days before his admission. In his history, he was born at term with a birth weight of 2500 g, an apgar of 10. He had since the age of 6 months episodes of abdominal bloating, crying, profuse diarrhea and food vomiting. No diagnosis was made after several medical visits to the pediatrician. In admission he a growth retardation, a good conscience, well-colored conjunctiva, hemodynamic and respiratory stability, a body weight of 14 kg, a Z score of −2, a temperature of 37.5˚C. His abdomen was distended, with a tympanism. The rectal ampoule was empty on digital rectal examination. A Plan abdominal radiograph revealed mixed-type hydro-aeric levels (small intestinal, colic) with absence of rectal air (Figure 1). A biological assessment was carried out. The hemoglobin level was 12 g/dl, the hematocrit at 36, the white blood cells at 4000, the platelets at 150,000, the natremia at 120 mmol/L, the serum potassium at 2 mmol/L, the chloremia at 98 mmol/L and
Figure 1. Plan abdominal radiograph showing hydroaeric levels with no air in the rectum.
calcemia at 2.25 mmol/L, urea at 3 mmol/L and creatinemia at 60 μmol/L. Because of this clinical picture, the diagnosis of intestinal volvulus was retained and the patient was prepared for surgery. The intervention was carried out after 4 hours of resuscitation. During surgical exploration, a paraduodenal and retrocolic hernial sac (Figure 2) with intestinal contents was noted. After a reduction of hernial content, we have found a hernial sac with a collar of 11 cm and a deep of 18 cm (Figure 3). There was a small bowel volvulus with ileo-ileal bands (Figure 4). We untwisted the small intestine and released adhesions. The hernial sac was partially resected and closed. The operating outcome was simple. Intestinal transit resumed on D2 postoperatively. The child was discharged from the hospital on D5.
Peritoneal recesses are usually related to rotation of the gut and adhesion of abdominal viscera to the posterior abdominal wall during fetal development, and/or the presence of retroperitoneal vessels which raise serosal folds .
Figure 2. Hernial sac contening small bowel.
Figure 3. Retrocolic hernia sac with a collar of 11 cm and a deep of 18 cm.
Figure 4. Perioperative image of small intestinal volvulus.
Due to the complex nature of the rotation of the gut and resorption of the mesentery, these recesses may enlarge or recede, and individual variations may lead to the development of different recesses in this area. Paraduodenal fossa originates as congenital peritoneal anomaly owing to failure of mesenteric fusion with the parietal peritoneum. There is also an associated abnormal rotation during imprisonment of the small intestine beneath the developing colon. These recesses, therefore, are regarded as congenital and have been considered clinically and surgically as sites for internal abdominal hernias . Para duodenal hernia is the most common cause of internal hernia. It represents alone 53% of internal hernias and 75% of para-duodenal hernias . The left mesenterico-parietal or paraduodenal hernia is the protrusion of the intra-abdominal viscera through the Landzert paraduodenal fossa . According to some authors, they interest men three times more often than women  . Our case was also discovered in a boy.
These hernias are difficult to diagnose clinically. Internal hernia can be asymptomatic or cause significant discomfort ranging from constant vague epigastric pain to intermittent colicky periumbilical pain . Additional symptoms include nausea, vomiting and recurrent intestinal pain. In the history of our patient, we noted notions of repeated abdominal pain, notions of vomiting and diarrhea and a growth retardation with a Z score of −2. The frank occlusion picture was clear only at his 5th year of life.
Imaging studies often play an important role in the diagnosis of internal hernias. General radiographic features with barium studies include apparent encapsulation of distended bowel loops with an abnormal location, arrangement or crowding of small bowel loops within the hernia sac. In our patient, because of emergency a plan abdominal radiograph was performed and revealed several mixed air-fluid levels and an absence of air in the rectum which did not suggest an internal hernia. The upper intestinal transit was not carried out.
Today CT has become the first-line imaging technique in this pathology. On CT finding include mesenteric vessel abnormalities with engorgement, crowding, twisting and stretching of these vessels and displacement of other bowel segment, especially the transverse colon, a sac-like mass of small bowel loops interposed between the stomach and pancreatic tall and a posterior mass effect on the stomach . In our case, the computed tomography also was not carried out.
Ultrasonography has emerged as an important noninvasive method to evaluate the infant with emesis to exclude the diagnosis of pyloric stenosis. Additional information regarding the orientation of the superior mesenteric vessels also can be obtained by ultrasound and may be useful in suggesting the diagnosis of malrotation. In our case, ultrasound could have detected the volvulus of the small intestine associated with the hernia in the absence of abdominal distension.
Sometimes despite these meticulously performed radiologies the diagnosis remains uncertain and made intraoperatively  as was the case in our observation.
In an acutely ill child with midgut volvulus or obstruction, urgent operative correction is indicated and intravenous fluid resuscitation, placing a nasogastric tube and Foley catheter, typing and crossmatching blood, and giving broad-spectrum antibiotics must be done concurrently and expeditiously. Time is critical in terms of intestinal salvage. Peroperatively, the diagnosis of mesenterico-parietal hernia can be difficult. It first requires the location of the hernial opening and an anatomical definition of the structural components. The hernial sac is retro-colonic. The collar is located between the duodeno-jejunal angle at the top and the inferior mesenteric artery at the bottom, while the free edge of the collar contains the inferior mesenteric vein and its identification also contributes to the diagnosis  .
In these hernias, in the majority of cases, the collar is wide and not very tight as in our observation, thus making it possible to obtain a complete reduction of its content by simple traction. In case of difficulties it may be useful to open it, but having in mind the vascular risk in his anterior lip. The hole in the dimple must then be closed without necessarily resecting the hernial sac. In complicated forms, the expansion and fragility of the handles are such that reduction may be impossible. Some authors have proposed the first detachment of the meso colon allowing the approach of the first sac with possibly prior emptying of the small intestine. It may be necessary to resect a sphaceled bowell .
The hernial opening must be closed using absorbable sutures or not. But any attempt to excise the hernial sac should be prohibited   . In our observation, the hernial sac was large enough and was partially resected.
The intestinal malrotation must be treated at the same time as in our observation. In the immediate postoperative period, the child did not face any concern.
GI motility disturbances are common after operative correction of malrotation. Abnormalities characteristic of neuropathic pseudoobstruction raise the possibility of defective intrinsic enteric innervation. Further, the intestine may undergo reperfusion injury after reduction of a significant volvulus. Cytokines, bacteria, and other toxins may be released into the systemic circulation. This may contribute to hemodynamic instability during the intraoperative or early postoperative period.
Left para-duodenal hernia is a rare, but possible, cause of acute intestinal obstruction in children. This should be considered in the presence of spontaneously reduced episodes of sub-occlusion. Late diagnosis can cause complications such as loop necrosis.
Due to the scientific interest of the case, the child’s parents were informed and have given their consent for the publication.
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