- Case report
- Open Access
Endovascular treatment of a Superior Mesenteric Artery Syndrome variant secondary to traumatic pseudoaneurysm
© Au-Yong et al; licensee BioMed Central Ltd. 2010
Received: 8 February 2010
Accepted: 8 March 2010
Published: 8 March 2010
Pseudoaneurysms related to the superior mesenteric artery (SMA) are a recognised complication of trauma to the vessel, and successful treatment with stenting has been previously described. We report the case of a patient who presented with obstruction of the fourth part of the duodenum secondary to a traumatic pseudoaneurysm, a hitherto unreported variant of superior mesenteric artery syndrome. Exclusion of the pseudoaneurysm and relief of the duodenal obstruction were simultaneously achieved by placement of a covered stent.
Superior mesenteric artery pseudoaneurysm is a rare but recognised complication of traumatic injury to the artery [1–8]. It is caused by a full thickness breach of the artery wall. Other recognised causes include pancreatitis and iatrogenic events. It may also occur spontaneously. The condition is important as the risk of rupture is high and carries a significant mortality rate .
Superior mesenteric artery syndrome is more widely recognised, and results from obstruction of the duodenum where it passes between the superior mesenteric artery and aorta, by any process which narrows the angle between these two structures . In its commonest form it is not associated with an acquired structural abnormality: the angle between the SMA and aorta is constitutionally narrowed. In its best-known acquired variant, the aortoduodenal syndrome, the duodenum is compressed between the SMA and an abdominal aortic aneurysm . This case is unique, comprising both the first description of a variant of SMA syndrome caused by a traumatic SMA pseudoaneurysm and the first account of successful treatment of both the aneurysm and duodenal obstruction by endovascular stent placement.
Our 40 year-old male patient was the driver of a vehicle that collided at high speed with a fence post. He was transferred via air ambulance to hospital and on arrival was conscious and alert. Marked anterior abdominal wall bruising was evident consistent with injury relating to use of a lap belt, and he complained of diffuse abdominal pain. Abdominal computerised tomography (CT) demonstrated free intraperitoneal fluid. At laparotomy, approximately 3000 mls of haemoperitoneum was evacuated and devascularising mesenteric injuries were noted affecting segments of jejunum, terminal ileum, caecum and sigmoid colon (American Association for the Surgery of Trauma Grade 4 injuries). A subtotal colectomy with ileo-sigmoid anastamosis and resection of 10 cm of mid-jejunum was performed.
The potential risks of surgical repair of the pseudoaneurysm were considered to be very high for this patient, therefore mesenteric angiography was undertaken with a view to endovascular management. Selective angiography confirmed a large pseudoaneurysm arising from the main stem of the SMA, just beyond its first major jejunal branch (Figure 5). The aneurysm had no distinct neck and the vessel wall defect appeared to be substantial. Splayed vessels were noted draped around the pseudoaneurysm. Of the potential endovascular therapeutic options, embolisation and thrombin injection both risked occlusion of all or part of the SMA territory and were considered unsuitable whereas placement of a covered stent provided an opportunity to exclude the aneurysm without loss of the main vessel lumen.
The patient reported an almost immediate improvement in nausea and vomiting on clinical review on the ward following the first procedure and was discharged home. He did not attend hospital for subsequent follow-up imaging, but on telephone review remains well one year post-procedure with no recurrence of any of his symptoms.
In this case, follow up imaging would have been useful to examine for involution of the pseudoaneurysm and continued exclusion, as well as resolution of splaying of the vessels.
This unique case comprises both the first description of a variant of SMA syndrome caused by a traumatic SMA pseudoaneurysm, and the first account of successful treatment of both the aneurysm and duodenal obstruction by endovascular stent placement. Two similar cases were described in 1990 , however, in these cases, obstruction was caused by rupture of an SMA pseudoaneurysm, treated with open surgery.
Barium meal examination is useful for the diagnosis of SMA syndrome . It demonstrates both narrowing of the fourth part of the duodenum with increased transit time, proximal dilatation and uncoordinated peristaltic activity. Such functional information is not readily obtainable from CT.
CT proved to be the key modality for diagnosis in this patient. It enabled detection of the pseudoaneurysm and its relationship to the SMA. CT with 3D reconstruction has been used in SMA syndrome to demonstrate reduction of the angle between the SMA and the aorta .
Despite the paucity of cases of SMA pseudoaneurysm, several reports describe successful endovascular treatment of this condition. Open surgery is often rendered difficult by the underlying cause of the psuedoaneurysm (such as pancreatitis) or by adhesions, which increase the risk of failure of open vascular reconstruction and of anaesthesia in the unstable patient . Other options for treatment of this condition include placement of coils, injection of thrombin or N-butyl-2-cyanoacrylate (glue) .
This case presented an unusual challenge, as two problems needed addressing; stenting of the aneurysm to prevent subsequent rupture, and exclusion of the aneurysm sac to encourage involution and thus relieve the SMA syndrome. The immediate resolution of this patient's symptoms was most likely due to loss of pressure within the aneurysm sac by exclusion of arterial inflow. Data on possible shrinkage of aneurysm sacs post-stenting are conflicting, with one large series of 90 endovascular repairs of a range of visceral artery aneurysms demonstrating no shrinkage at follow-up imaging . However, one study reported shrinkage of abdominal aortic aneurysms post-stent placement . This phenomenon, in addition to decreased pressure within the sac, may be helpful in the treatment of aortoduodenal syndrome, which has hitherto only been treated by open repair.
A unique case of a variant of SMA syndrome secondary to a pseudoaneurysm is presented. Exclusion of the aneurysm and relief of the obstruction were simultaneously achieved by placement of a stent.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
- Tulsyan N, Kashyap VS, Greenberg RK, et al.: The endovascular management of visceral artery aneurysms and pseudoaneurysms. J Vasc Surg. 2007, 45 (2): 276-83. 10.1016/j.jvs.2006.10.049.View ArticlePubMedGoogle Scholar
- Kutlu R, Ara C, Sarac K: Bare stent implantation in iatrogenic dissecting pseudoaneurysm of the superior mesenteric artery. Cardiovasc Intervent Radiol. 2007, 30 (1): 121-3. 10.1007/s00270-005-0392-6.View ArticlePubMedGoogle Scholar
- Wallace MJ, Choi E, McRae S, Madoff DC, Ahrar K, Pisters P: Superior mesenteric artery pseudoaneurysm following pancreaticoduodenectomy: management by endovascular stent-graft placement and transluminal thrombin injection. Cardiovasc Intervent Radiol. 2007, 30 (3): 518-522. 10.1007/s00270-006-0109-5.View ArticlePubMedGoogle Scholar
- Ray B, Kuhan G, Johnson B, Nicholson AA, Ettles DF: Superior mesenteric artery pseudoaneurysm associated with celiac axis occlusion treated using endovascular techniques. Cardiovasc Intervent Radiol. 2006, 29 (5): 886-9. 10.1007/s00270-004-0113-6.View ArticlePubMedGoogle Scholar
- Tsai HY, Yang TL, Wann SR, Yen MY, Chang HT: Successful angiographic stent-graft treatment for spontaneously dissecting broad-base pseudoaneurysm of the superior mesenteric artery. J Chin Med Assoc. 2005, 68 (8): 397-400. 10.1016/S1726-4901(09)70183-2.View ArticlePubMedGoogle Scholar
- Szopinski P, Ciostek P, Pleban E, Iwanowski J, Serafin-Krol M, Marionawska A, Noszczyk W: Percutaneous thrombin injection to complete SMA pseudoaneurysm exclusion after failing of endograft placement. Cardiovasc Intervent Radiol. 2005, 28 (4): 509-14. 10.1007/s00270-004-0160-z.View ArticlePubMedGoogle Scholar
- Huang YK, Tseng CN, Hseih HC, Ko PJ: Aortic valve endocarditis presents as pseudoaneurysm of the superior mesenteric artery. Int J Clin Pract. 2005, 59 (Suppl 147): 6-8. 10.1111/j.1368-504X.2005.00381.x.View ArticleGoogle Scholar
- Gandini R, Pipitone V, Konda D, Pendenza G, Spinelli A, Stefanini M, Simonetti G: Endovascular treatment of a giant superior mesenteric artery pseudoaneurysm using a nitinol stent-graft. Cardiovasc Intervent Radiol. 2005, 28 (1): 102-6. 10.1007/s00270-004-0007-7.View ArticlePubMedGoogle Scholar
- Lippl F, Hannig C, Weiss W, Allescher HD, Classen M, Kurjak M: Superior mesenteric artery syndrome: diagnosis and treatment from the gastroenterologist's view. J Gastroenterol. 2002, 37 (8): 640-3. 10.1007/s005350200101.View ArticlePubMedGoogle Scholar
- Deitch JS, Heller JA, McCagh D, D'Avala M, Kent KC, Plonk GW, Hansen KJ, Liguish J: Abdominal aortic aneurysm causing duodenal obstruction: two case reports and review of the literature. J Vasc Surg. 2004, 40 (3): 543-7. 10.1016/j.jvs.2004.04.028.View ArticlePubMedGoogle Scholar
- Rappaport WD, Hunter GC, McIntye KE, Ballard JL, Malone JM, Putnam CW: Gastric outlet obstruction caused by traumatic pseudoaneurysm of superior mesenteric artery. Surgery. 1990, 108 (5): 930-2.PubMedGoogle Scholar
- Applegate GR, Cohen AJ: Dynamic CT in superior mesenteric artery syndrome. J Comput Assist Tomogr. 1988, 12: 976-80. 10.1097/00004728-198811000-00013.View ArticlePubMedGoogle Scholar
- Sier MF, Van Sambeek MR, Hendriks JM, et al.: Shrinkage of abdominal aortic aneurysm after successful endovascular repair: results from single center study. J Cardiovasc Surg (Torino). 2006, 47 (5): 557-61.Google Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.