para - aortic and pelvic lymphadenectomy is often performed in the treatment of ovarian or testicular cancer .
internal herniation of a small bowel behind the external iliac artery after lymphadenectomy is a very rare complication to this procedure and to our knowledge only reported twice in the literature . in the first paper published in 1978
the author described how they managed their patient with laparotomy and resection of a perforated small bowel .
the hernia orifice was closed by using a free peritoneal graft harvested from the under surface of the anterior abdominal wall .
this patient had to undergo several surgical procedures to re - establish blood flow to the extremity because of trombosis of the iliac artery .
as there are few similar cases reported worldwide , there is no consensus or guidelines available .
we did not close the orifice . because of the skeletonized vessel we were afraid of compromising the vessel if we tried to close the defect . at follow - up after 10 months
a 56-year - old woman underwent in 2008 prophylactic bilateral laparoscopic salpingoophrectomy because of a mutation in brca1 gene .
the histological result revealed a serous papillary adenocarcinoma in the right ovary and on its surface . therefore a restaging operation was performed .
she underwent laparotomy with total abdominal hysterectomy , omentectomy , appendectomy , with a radical retroperitoneal lymphadenectomy which involved  en bloc  dissection and removal of the para - aortic and iliac lymphe nodes .
there was no metastasis in the biopsies taken from the rectum wall and the laparoscopy trocar ports as well as the 46 harvested lymphe nodes .
the patient did not receive any radiation therapy . in 2012 , 4 years later , she was admitted to hospital with a 2 days history of severe abdominal pain , vomiting and the inability to pass gas or stools for the last few days .
the abdomen was distended , diffused tender and tympanitic , without guarding or rebound tenderness .
her groin examination was normal without any sign of herniation through the femoral or inguinal canals .
blood pressure 140/90  mmhg , pulse 71 beats / minute and a temperature of 37.9  c .
our patient received 90  ml of iomeprol 350  mgl / ml i.v . and this was sufficient to see the vessels .
the ct scan demonstrated transition zone both where the loop entered behind the external iliac vessel and where the intestine passed out behind the vessel as a closed loop .
the small bowel was dilated both proximal to , as well as inside the closed loop ( figs . 2 and 3 ) .
the patient received a prophylactic antibiotics composed of metronidazole 1.5  g and doxycycline 400  mg i.v .
we established pneumoperitoneum with a pressure of 12  mmhg and inserted two other working ports of 12  mm and one of 5  mm .
we examined the non dilated bowel from the ileocoecal junction , approximately 200  cm from the ilecoecal junction the small bowel made a closed loop underneath the left external iliac artery ( picture 1 ) .
the small bowel was strangulated by the external iliac vessel . by gentle manipulation we reduced the herniated small bowel ( picture 2 ) that soon recovered .
the blue color and venous congestion were fading out and we noticed peristaltic movement of the previously herniated bowel we therefore did not perform any bowel resection . the defect underneath the artery was about 23  cm ( picture 3 ) in diameter .
we found it risky to try to close the orifice and decided to leave it unrepaired .
we noticed pulsation on the iliac vessel after the small bowel reduction and we evaluated the pulsation of the dorsalis pedis artery and the posterior tibial artery during the operation .
the abdomen was exsufflated and the fascia defects in the 12  mm ports were sutured and the skin closed with stapler .
the patient was observed in the intensive care unit until the next morning , with focus on her leg pulse and color .
dalteparin 5000 ie was given subcutaneously 6  h after surgery and continued for the first 24  h after surgery .
the postoperative course was uneventful and she was discharged from hospital the day following operation .
due to limited peritoneum in the area of the hernia defect and the skeletonized external iliac artery , we did not do any direct suture of the orifice as this might have compromised the artery and/or the vein . due to previous omentectomy ,
an alternative might have been to harvest a free peritoneum graft to cover the defect as described in the two other cases .
another option was to use a mesh covered with an oxidized regenerated cellulose or expanded polytetrafluoroethylene ( eptfe ) that minimize bowel adhesions .
a longer follow - up of the patient is needed to clearly conclude if this simple procedure has been sufficient .
if the patient later experience any sign of recurrence and need another operation we will have to close the defect .
a challenge would have been if the bowel could not be reduced due to long standing obstruction .
in such a case a bowel resection and/or a vascular surgical procedure might have been necessary .
the small bowel in ileus might be fragile , gangrenous or necrotic and there is probably a higher risk of bowel perforation performing a laparoscopic approach .
we do not routinely use verres needle in laparoscopy , we prefer to use visiport as an optical trocar or an open hasson approach that is another safe alternative to minimize the chance of bowel perforation on entrance into the abdominal cavity .
strangulated internal hernia behind the iliac vessel is a rare entity only reported twice in the literature .
this is the first case in the literature where laparoscopically reduction of the internal herniated bowel underneath the iliac vessel is performed .
a quick recovery with no complications , short hospital stay and minimal discomfort postoperatively made our approach an acceptable surgical option for this patient .
written informed consent was obtained from the patient for publication of this case report and accompanying images .
a copy of the written consent is available for review by the editor - in - chief of this journal on request .
 introductioninternal herniation of a small bowel behind pelvic vessels is a rare complication seen after pelvic lymphadenectomy.presentation of casea 56-year - old woman was operated due to a gynecological cancer . 
 4 years thereafter she presented with a 2 days history of abdominal pain and vomiting . 
 clinical and radiological findings indicated a small bowel obstruction . 
 a loop of small bowel had herniated behind the left external iliac artery . using laparoscopic technique 
 the herniated bowel was reduced . due to limited peritoneum around the area and skeletonized vessel , we decided not to do any repair of the hernia orifice 
 . the postoperative recovery was uneventful , bowel activity returned to normal and she was discharged the next day.follow-up was done at 1 month and the latest at 10 months . 
 she did nt experience pain or discomfort after the operation.discussiondue to limited peritoneum around the skeletonized vessel , we decided to leave the hernia orifice unrepaired . 
 we found it hazardous to do any direct suture of the orifice or use a free peritoneal graft to repair the defect as the fibrosis and inflammatory process might have compromised the artery or the vein . 
 a longer follow - up of the patient is needed to clearly conclude if this simple procedure has been sufficient . 
 we agreed that if the patient would experience any sign of recurrence and need another operation we would close the defect at that time.conclusion4 years after pelvic lymphadenectomy a small bowel herniation behind an external iliac artery occurred . 
 the patient was successfully treated with reduction of the small bowel using laparoscopic technique . a quick recovery with minimal discomfort and no sign of recurrence after 10 months made our approach an acceptable surgical option . 
Introduction
Presentation of case
Discussion
Conclusion
Conflicts of interest
Funding
Ethical approval statement