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A 65-year-old man with an established diagnosis of Crohn's colitis presented as an emergency with peritonitis and free subdiaphragmatic air on erect chest X-ray. At laparotomy, a grossly distended colon was noted, with two sites of perforation at the rectosigmoid and splenic flexure areas. Multiple non-dilated jejunal diverticula were noted coincidentally. Subtotal colectomy with cross-stapling of the rectum and formation of an end ileostomy was performed. He made an uneventful early postoperative recovery but during the fourth postoperative week he developed intermittent, colicky abdominal pain, vomiting and reduced ileostomy output. Subacute small bowel obstruction secondary to adhesions was diagnosed after clinical and radiological examination. Conservative treatment with intravenous fluids and nasogastric decompression produced an initial improvement but on the 32nd postoperative day the patient suddenly collapsed and died from a cardiorespiratory arrest secondary to acute renal failure and septic shock. At post-mortem examination, evidence of proximal jejunal diverticular disease with signs of acute diverticulitis and perforation were noted along with widespread peritonitis. No histological features of Crohn's disease were identified in the segment of perforated jejunum, or elsewhere in the bowel, and the inflammatory process was centred around the diverticulum (figure).
- What is the incidence of small bowel diverticula?
- What is the aetiology of small bowel diverticulosis?
- List the common pre-operative clinical manifestations of small bowel diverticula.
Small bowel diverticula are uncommon, occurring in 0.5–2.3% of small bowel contrast studies1 and 0.06–1.3% of post-mortem examinations.2 They manifest most frequently in the sixth and seventh decades of life and were thought to occur more commonly in males,3 although one study has shown a preponderance for females.1
Non-Meckelian small bowel diverticula are thought to be acquired pulsion defects caused by possible underlying abnormalities in peristalsis which in turn produce segmentally high intraluminal pressures.4 Jejunal diverticulosis has been described in association with systemic sclerosis and visceral neuropathy or myopathy.5 The diverticula of mucosa and submucosa emerge at natural weak sites where mesenteric vessels penetrate the intestinal wall explaining the observation that they are most commonly located at the mesenteric side of the bowel.6 Small bowel diverticula occur more frequently in the proximal jejunum and distal ileum where the vasa recti of greatest diameter are found.6
Common pre-operative complications associated with jejuno-ileal diverticula include haemorrhage, obstruction, diverticulitis, perforation, malabsorption, anaemia and chronic vague abdominal pain (box FB1).6 The most common clinical signs include hyperactive bowel sounds, hyper-resonance with epigastric percussion and vague epigastric discomfort on palpation.1Complications of small bowel diverticula may manifest in different ways with varying frequencies according to their anatomical location (boxFB2).
There are no reliable diagnostic tests to confirm the presence of small bowel diverticula. Erect abdominal X-rays may show air–fluid levels throughout the small bowel. The classic triad of features associated with jejuno-ileal diverticular disease consists of vague abdominal pain, anaemia and dilated loops of small bowel on abdominal X-ray.7 If the presence of small bowel diverticula is suspected then a small bowel barium follow-through study or enteroclysis can be performed. While the former easily demonstrates large diverticula, smaller ones may not be identified because of inadequate filling with contrast or due to extrinsic abdominal compression.8 Thus, a negative barium follow-through study does not exclude small bowel diverticular disease. Workers have shown that enteroclysis has a greater sensitivity at detecting diverticulae.8 This investigation should be borne in mind for the patient with persisting abdominal symptoms who has undergone negative endoscopic and standard contrast studies of both upper and lower gastrointestinal tracts.1 Small bowel diverticulitis should also be included in the differential diagnosis of a small bowel inflammatory mass demonstrated by computed axial tomography.9 Upper gastrointestinal endoscopy and laparotomy are the two other main methods for diagnosing the presence of small bowel diverticula.5
In jejunal diverticular disease, obvious perforation, bleeding, or mechanical complications require resection with primary anastomosis. Failure of medical therapy in cases of blind loop syndrome or nonmechanical obstruction from severe jejunal dysmotility in the presence of diverticula may also benefit from resection of the affected segement. A dilated, hypertrophied segment of jejunum with large diverticula, suggestive of a progressive form of diverticular disease, which is found coincidentally at laparotomy should also be resected.6 The majority of ileal diverticulae on the other hand do not require operative intervention, except in cases of perforation, bleeding, or obstruction which occur less frequently than in jejunal disease. Excision of a coincidental, solitary, non-Meckelian ileal diverticulum in an adult is not warranted.1 6
Jejunal diverticula are probably more common than reported.7 They may be easily overlooked at operation as they are frequently present between the leaves of mesentery.4 In asymptomatic jejuno-ileal diverticular disease, noted coincidentally at operation or during radiological investigations, the risk of complications ensuing was 18% at a mean follow-up of 4.8 years in one series.10 The above case illustrates that serious complications of jejunal diverticular disease can arise in the early postoperative period. To date, there have been no reports in the literature of jejunal diverticular disease causing early postoperative complications. The coincidental finding of previously asymptomatic jejunal diverticula at laparotomy, whilst uncommon, should always be considered in the differential diagnosis of subsequent early postoperative symptoms suggestive of subacute small bowel obstruction. Failure to do so, with attention and management focussed on more likely causes for such symptoms may mask the true diagnosis with fatal consequences.
Fatal perforated acute jejunal diverticulitis complicating postoperative recovery following emergency subtotal colectomy for perforated fulminant Crohn's colitis.
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