title: Small-bowel obstruction after laparoscopic Roux-en-Y gastric bypass surgery.
abstract: OBJECTIVE
  The purpose of this study was to review the etiology and computed tomography (CT) findings of small-bowel obstruction (SBO) in patients who have undergone bariatric laparoscopic Roux-en-Y gastric bypass (LGBP) surgery.
  
  
  METHODS
  Prospectively entered data from a surgical database of 835 consecutive patients who underwent antecolic-antegastric LGBP for morbid obesity from June 1999 to April 2005 in a single institution were retrospectively reviewed. A total of 42 cases of bowel obstruction were observed in 41 patients. Surgical proof was available in 38 cases, and 4 cases had characteristic imaging features and/or clinical follow-up. Seventeen CT scans were reviewed to determine cause and level of obstruction, and this was correlated with surgical findings and clinical follow-up.
  
  
  RESULTS
  Internal hernia was the most common (13 cases) and also the most frequently missed etiology of SBO on CT scans, with the diagnosis being made prospectively in only 2 of 6 cases, in which CT was done. Adhesions, ventral hernia, postoperative ileus, and jejunojejunal (JJ) anastomotic strictures, in that order, were the other commonly observed etiologies for SBO, with 11, 7, 5, and 4 cases, respectively. Some causes of SBO post-LGBP (JJ anastomotic stricture and postoperative ileus) developed relatively early, whereas others (internal hernia) tended to develop later or had a bimodal distribution (adhesions and ventral hernia). Fifteen (36%) of 42 cases had SBO at or near the level of jejunojejunostomy site; causes included internal hernia (5 cases), adhesions/kinking of small bowel (5 cases), JJ anastomotic stricture (4 cases), and JJ intussusception (1 case).
  
  
  CONCLUSIONS
  The time interval between LGBP and development of SBO might provide a useful clinical clue to its etiology. The JJ level is an important location for SBO post-LGBP because of a variety of causes, and special attention must be paid to this site at imaging of post-LGBP patients.
authors.affiliation: Department of Radiology, University of Massachusetts, Worcester, MA 01655, USA.
authors.forename: Gowthaman
authors.initials: G
authors.lastname: Gunabushanam
authors.forename: Sridhar
authors.initials: S
authors.lastname: Shankar
authors.forename: Donald R
authors.initials: DR
authors.lastname: Czerniach
authors.forename: John J
authors.initials: JJ
authors.lastname: Kelly
authors.forename: Richard A
authors.initials: RA
authors.lastname: Perugini
mesh_terms: D000328:Adult; D015897:Comorbidity; D005260:Female; D015390:Gastric Bypass / Q000706:statistics & numerical data*; D006547:Hernia / Q000000981:diagnostic imaging / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D007415:Intestinal Obstruction / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D010535:Laparoscopy / Q000706:statistics & numerical data*; D008297:Male; D008404:Massachusetts / Q000453:epidemiology; D008875:Middle Aged; D011183:Postoperative Complications / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D011859:Radiography; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods; D012307:Risk Factors; D055815:Young Adult