Abstract
Objectives
To evaluate the incidence, management, and outcome of visceral artery aneurysms (VAA) over one decade.
Methods
233 patients with 253 VAA were analyzed according to location, diameter, aneurysm type, aetiology, rupture, management, and outcome.
Results
VAA were localized at the splenic artery, coeliac trunk, renal artery, hepatic artery, superior mesenteric artery, and other locations. The aetiology was degenerative, iatrogenic after medical procedures, connective tissue disease, and others. The rate of rupture was much higher in pseudoaneurysms than true aneurysms (76.3 % vs.3.1 %). Fifty-nine VAA were treated by intervention (n = 45) or surgery (n = 14). Interventions included embolization with coils or glue, covered stents, or combinations of these. Thirty-five cases with ruptured VAA were treated on an emergency basis. There was no difference in size between ruptured and non-ruptured VAA. After interventional treatment, the 30-day mortality was 6.7 % in ruptured VAA compared to no mortality in non-ruptured cases. Follow-up included CT and/or MRI after a mean period of 18.0 ± 26.8 months. The current status of the patient was obtained by a structured telephone survey.
Conclusions
Pseudoaneurysms of visceral arteries have a high risk for rupture. Aneurysm size seems to be no reliable predictor for rupture. Interventional treatment is safe and effective for management of VAA.
Key Points
• Diagnosis of visceral artery aneurysms is increasing due to CT and MRI.
• Diameter of visceral arterial aneurysms is no reliable predictor for rupture.
• False aneurysms/pseudoaneurysms and symptomatic cases need emergency treatment.
• Interventional treatment is safe and effective.
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Introduction
Visceral arterial aneurysms (VAAs) are a rare entity; they are often asymptomatic, incidental findings in computed tomography (CT) and magnetic resonance imaging (MRI). VAAs can present as life-threatening ruptures that require emergency treatment. However, discriminating between VAAs that are harmless incidental CT findings which do not require treatment and high-risk aneurysms is not always possible. Several publications recommend treatment of VAAs >2 cm in diameter [1–5]. Nonetheless, clinical experience indicates that the risk of rupture depends not only on the aneurysm diameter, but also upon VAA localization [3]; underlying disease, such as congenital defects (e.g., Ehlers-Danlos Syndrome), atherosclerosis, and mycotic/inflammatory aneurysm [6–8]; and the rate of growth [9, 10]. In contrast to true aneurysms, which feature distension of all three layers of the arterial wall, so-called false aneurysms or pseudoaneurysms result from a breach of the inner-wall layers, resulting in bulging of the adventitial layer. False aneurysms are often caused by iatrogenic trauma, e.g. after hepatobiliary or vascular surgery.
This retrospective study reviewed all cases of VAA seen at our university medical centre over a 10-year period. Our objective was to characterize the incidence of VAA, identify possible risk factors for aneurysm rupture, and compare surgical and interventional–radiological approaches with respect to clinical outcome.
Materials and methods
For patient selection, we searched our institutional database (covering years 2000–2010) for the term ‘aneurysm’, which yielded 12,588 radiological reports, mostly related to aortic pathologies. A total of 233 patients were identified as having VAA. Information about patient age, sex, presenting symptoms and signs, diagnostic modalities, risk factors, co-morbidities, recent operations, and medication was obtained from medical records and office charts. Data were analysed according to anatomic features, such as aneurysm location and diameter, true or false aneurysm, and aneurysm status (ruptured or non-ruptured). The aetiology of each aneurysm was retrospectively deduced and analysed from the underlying diseases documented in the patients’ records, previous medical procedures, and from clinical findings at admission.
Clinical management of the patients was investigated in terms of surgical therapy, interventional treatment and watchful waiting. The specific type of surgical and interventional technique was obtained from medical reports and from imaging.
The clinical course of the patients was investigated by means of a structured telephone survey of all patients or their relatives and of their general medical practitioners. The survey included all available information on successive hospital stays, surgical or interventional treatment, and current clinical condition.
Results
We identified 233 patients (age 65 ± 13 years [range 17–95 years], 142 men and 91 women) diagnosed with a total of 253 VAAs over the course of a decade (Table 1). In the majority of cases VAA involved the splenic artery (n = 83), followed by the coeliac trunk (n = 47), the renal arteries (n = 44), the hepatic artery (n = 40), the superior mesenteric artery and its branches (n = 17), the gastroduodenal artery (n = 10), the pancreaticoduodenal artery (n = 8), the gastric artery (n = 4), and combinations of these as listed in Table 2. Thirty-seven aneurysms in 35 patients presented with rupture; the majority of aneurysms were detected in a non-ruptured condition (n = 216 aneurysms). Over 90 % of the aneurysms (n = 231 in 212 patients) were detected by CT scans, followed by angiography (n = 13 in 12 patients) and MRI (n = 9 in 9 patients). Radiological follow-up was 18.0 ± 26.8 months (range: 1 day to 109 months).
Sixty-two of the 233 patients (26.6 %) presented with specific symptoms upon admission to hospital, and all 35 patients with ruptured aneurysms showed symptoms. A reduced haemoglobin count of 8.2 ± 1.6 g/dl in 34 of 62 patients (54.8 %) was the most frequent sign of rupture. Eleven of 62 symptomatic patients (17.7 %) presented with abdominal pain. For a summary of the patients’ clinical presentation, see Table 3.
One hundred and seventy-one of the 233 patients (73.4 %) had no specific symptoms. In 13 asymptomatic patients, a VAA was already known from previous examinations. Of the 171 asymptomatic patients, 158 (92.4 %) were incidentally diagnosed with a VAA. Indications for imaging in patients with incidental findings included follow-up examinations after tumour treatment or other medical conditions (n = 91), suspected illness unrelated to the VAA (n = 44), tumour staging (n = 20), and preoperative imaging (n = 3).
According to the retrospective rating described above, the main aetiology of VAA was degenerative atherosclerosis (197 of 253 aneurysms; 77.9 %), with varying degrees of calcification of the arteries. Moreover, there were 13 post-stenotic aneurysms, with arterial stenosis of the coeliac trunk or its tributaries and stenosis of the superior mesenteric artery (Table 2). The second most frequent aetiology was diverse complications after preceding medical procedures, with 23 iatrogenic false aneurysms of the hepatic artery or its tributaries as well as the renal artery. The remaining VAAs developed in patients with vasculitis due to connective tissue diseases, hereditary diseases like Ehlers-Danlos syndrome, fibromuscular dysplasia, and hereditary haemorrhagic telangiectasia. Seven VAAs occurred secondary to inflammatory diseases, such as pancreatitis. Rare causes for VAA included trauma, tumours and mycotic aneurysms after infection (e.g., endocarditis).
A total of 196 pathologies were rated as true aneurysms, compared to 38 false aneurysms. The remaining 19 aneurysms could not be clearly assigned to one of these two groups and were therefore labelled as indeterminable aneurysms. These aneurysms were caused either by infection or diseases of the connective tissue, which are known to cause both true as well as false aneurysms (11-20). Since no histological information was available that would allow us to reliably classify these aneurysms as true or false, we decided to analyse them separately in order to minimize any bias. For an overview of the incidence and location of true, false and indeterminable aneurysms, see Fig. 1.
Incidence and localization of true, false and indeterminable aneurysms. SA splenic arterial aneurysm, HA hepatic arterial aneurysm, SMA superior mesenteric artery aneurysm, CT coeliac trunk aneurysm, GDA gastroduodenal artery aneurysm, PDA pancreaticoduodenal artery aneurysm, RA renal artery aneurysm, GA gastric artery aneurysm
Thirty-seven of 253 VAAs (14.6 %) presented with aneurysm rupture (Table 4). The majority of ruptured aneurysms were pseudoaneurysms (n = 29). True VAAs presented with a rupture rate of 3.1 % (six out of 196 aneurysms). Vice versa, false VAAs had a significantly higher rupture rate of 76.3 % (29 of 38 aneurysms). There was evidence of rupture of indeterminable VAAs in two cases.
The mean overall size of the VAAs was 16.1 ± 9.8 mm, with a wide range of diameters (4.0–111.9 mm), which varied depending upon VAA localization (Table 4). There was no significant difference between the diameters of ruptured aneurysms compared to non-ruptured aneurysms (14.8 ± 8.2 mm vs. 16.3 ± 10.0 mm, respectively). However, in 18 cases, the aneurysm size could not be determined, because the aneurysm rupture prevented delineation and reliable diameter measurement within the haematoma. The greatest diameters were found in splenic artery aneurysms (SAAs). The overall maximum diameter was up to 111.9 mm in a non-ruptured SAA compared to 34.7 mm in a ruptured HAA. Excluding these outliers of diameters in both groups, the mean transverse diameter of non-ruptured and ruptured cases was nearly equal (15.9 ± 7.4 mm vs. 14.3 ± 7.5 mm, respectively). Moreover, there was no significant difference between the mean diameters of false aneurysms compared to true aneurysms (15.6 ± 7.6 mm vs. 16.3 ± 10.3 mm, respectively) (Table 4).
Specific aneurysm-targeted treatment was applied to 59 of the 253 VAAs (23.3 %) by means of interventional techniques (n = 45) or open surgery (n = 14) (Fig. 2). Thirty-six VAAs with aneurysm rupture or contained rupture (14.2 %) were treated on an emergency basis. In one ruptured VAA, a spontaneous occlusion was observed during emergency angiography, which was confirmed in a postangiographic CT. An additional 23 non-ruptured VAAs (9.1 %) were treated electively at the discretion of the interventional radiologist or surgeon based on individual findings (e.g., aneurysm growth or underlying disease); 13 by means of intervention and ten surgically. The remaining 193 cases were rated clinically harmless without suspicious symptoms and without need for immediate treatment; these cases were followed up by watchful waiting.
Interventional treatment was applied to 27 aneurysms with coil embolization, four aneurysms were treated with glue embolization, five aneurysms with stent grafts, and another nine aneurysms with combinations of treatments (i.e., coil embolization + stentgrafts, coil embolization + glue embolization, or coil embolization + Amplatzer plug). The surgical procedures included ligation of the artery and resection of the aneurysm in seven aneurysms, vascular reconstruction and bypass in three aneurysms, and ligation and en-bloc resection of the adjacent organ (i.e., spleen or kidney) in two aneurysms. An additional two patients with aneurysms of the hepatic artery received aneurysm resection during liver transplantation, in whom the VAA was only an accompanying pathology (Fig. 2).
There was no periprocedural mortality after radiological intervention or open surgery. The 30-day mortality after interventional treatment of VAA was in total 5 % (n = 2 of 40 patients), one patient after coil embolization and the other after stent grafting. Since both deaths occurred in the emergency setting, the mortality was 6.7 % (n = 2 of 30 patients) in this subgroup. There was no 30-day mortality in the 11 patients who underwent open surgery; however, due to the small number of cases, we were unable to make comparisons with the interventional group or draw conclusions. For further details concerning the management of VAA, see Table 5.
The overall rate of periprocedural complications after interventional treatment was 12.5 % (five complications in 40 patients) including one patient with myocardial infarction (ruptured VAA), two splenic infarctions, one patient with parenchymal abscesses (liver), and one with intracerebral bleeding (ruptured VAA). Four of the five complications occurred in patients with a ruptured VAA. Secondary bleeding after interventional treatment occurred in five cases. After open surgery, two out of 11 patients (18.2 %) suffered from perioperative complications: one splenic abscess (ruptured VAA), and one insufficient anastomosis after venous bypass interponate (non-ruptured VAA). Secondary bleeding occurred in two patients after open surgery (one in a ruptured and one in a non-ruptured VAA); Tables 6 and 7 summarize the complications that occurred after interventional and surgical treatment, respectively. Patients with VAA who were stratified for watchful waiting had a 30-day mortality of 6.6 % (12 of 182 patients), without any death caused by verified aneurysm rupture.
Cross-sectional imaging was available for 143 of 233 patients (61.4 %) and comprised CT and/or MRI at a mean follow-up of 18.0 ± 26.8 months. The current status of the patients was obtained by a structured telephone survey conducted a mean of 51.0 ± 32.1 months after treatment. The survey yielded conclusive information for 228 of 233 patients. The structured interview inquired about the patients’ health, current medication and past hospital stays. Only five patients were lost to follow-up, resulting in high-quality data with a completion rate of 97.9 %. Of the 228 patients included in the follow-up, 161 (70.6 %) were alive and 67 (29.4 %) were deceased. Causes of death were progressive tumour (n = 33), cardiovascular events (n = 12), post-transplantation complications (n = 6), infection (n = 5), liver cirrhosis (n = 1), renal insufficiency (n = 2), complications of insufficient hepaticojejunostomy (n = 1), complications of systemic lupus erythematosus (n = 1), appendicitis (n = 1), intracerebral bleeding after double antiplatelet therapy 30 days after insertion of a stent graft for a ruptured HAA (n = 1), and gastrointestinal bleeding without clinical evidence of VAA rupture (n = 1). Moreover, there were three inconclusive deaths, including two patients with renal artery aneurysm (RAA) and SAA, which were conservatively treated. The third patient received a venous bypass for RAA and died 7 years after the procedure. Retrospectively, it remained unclear whether any of these inconclusive deaths were related to VAA complications.
Seventeen of the 161 remaining patients (10.6 %) suffered from some sort of abdominal complaint during follow-up; these were related to cholangitis (n = 2), duodenal ulcers (n = 2), gallstones (n = 2), splenic infarction (n = 2), reflux oesophagitis (n = 2), colitis (n = 1), chronic pancreatitis (n = 1), and chronic type B aortic dissection (n = 1). Four patients had abdominal complaints due to unknown causes (n = 4).
Discussion
The purpose of this study was to investigate the incidence, aetiology and current management of VAA at our university medical centre. The overall incidence of VAA was relatively low, with a total of 233 patients presenting with 253 VAAs over a 10-year period. The most frequent aetiology was degenerative/atherosclerotic, which accounted for more than two-thirds of all cases. The second most frequent aetiology was complications after preceding medical procedures, with a 9.1 % rate of iatrogenic false aneurysms. Vasculitis and diverse specific connective tissue disease were uncommon causes of VAA [11–19].
The prevalence of VAA is reported to be 0.1–2 % [20, 21]; however, the number of undetected VAAs may be much higher. The clinical presentation is nonspecific in most cases, and the diagnosis of VAA is often an incidental finding. It is the general consensus that symptomatic VAA should be treated immediately, since rupture is associated with a high mortality rate [9, 22, 23]. A wide range of rupture rates have been reported [20–22, 24, 25], and emergency treatment of ruptured VAA has mortality rates of up to 30 % [26, 27]. In our patients, VAA rupture resulted in intraperitoneal, retroperitoneal and gastrointestinal bleeding, as well as bleeding into adjacent organs. A striking number of VAA ruptures occurred after medical procedures. In our study, the 30-day mortality rate was comparably low in these cases; however, there was a considerable complication rate after interventional treatment and open surgery (12.5 % and 18.2 %, respectively).
The decision to treat or not to treat asymptomatic VAA poses a challenge in elective cases [24, 27–30], and the treatment modality used varies based on location, clinical symptoms and co-morbidities [24, 28]. There are no evidence-based data to rely on, and individual treatment decisions are based on clinicians’ experience and the technical facilities of the interventional radiologist or surgeon. According to the guidelines, treatment is suggested for VAA with diameters >2 cm or if the VAA is three times greater in diameter than the respective normal artery [9, 24, 29]. However, we did not find any difference in mean diameters between ruptured and non-ruptured aneurysms. Therefore, VAA diameter alone appears to be an inadequate criterion for decision making [24, 31, 32]. At our institution, treatment decisions for individual cases are based on an interdisciplinary discussion including the aetiology of the aneurysms and all clinical aspects of the particular case. To determine other possible risk factors, we tried to identify additional criteria. In our series, pseudoaneurysms presented with a significantly increased risk for rupture, with 76.3 % of pseudoaneurysms being ruptured. By comparison, true VAA presented with a rupture rate of 3.1 %. Whether beta blockers have a preventive effect is still a matter of debate [24, 31]. Aneurysm calcification indicates a longstanding and therefore probably more stable aneurysm. In our series, 27.3 % of non-ruptured VAAs presented with some calcification, whereas none of the ruptured cases did. Parietal thrombosis was not associated with rupture risk in our series. Patients with ruptured VAAs were slightly less likely to be taking beta blockers compared to those with non-ruptured VAAs (35.1 % vs. 37.5 %, respectively). Steroid usage was slightly higher in the group of patients with ruptured VAAs.
The distribution of VAAs in our study was mostly in concordance with the literature. SAAs are reported to be the most frequent VAA; they account for up to 60 % of all VAAs [5, 6]. Bedford et al. [6] discovered 10.4 % SAAs in a routine post-mortem study of 250 bodies. Our data confirm that SAAs occurred with the highest frequency; SAAs accounted for 32.8 % of all VAAs, with a female:male ratio of 1.2:1. Common risk factors for SAA are female gender, pregnancy and portal hypertension [21, 28]. None of our patients were pregnant, and only one was of reproductive age. Recent reports have suggested an increasing incidence of HAA, which can be attributed to the more-frequent use of CT imaging after blunt liver trauma and hepatobiliary intervention [22, 33, 34]. A total of 17.5 % HAAs had a history of pancreaticoduodenectomy or biliary tract intervention. With respect to superior mesenteric artery aneurysm (SMAA) and aneurysms involving smaller branches of the coeliac trunk (gastric, pancreaticoduodenal and gastroduodenal arteries), our data are similar to that of other reports, with a 6.7 % prevalence of SMAAs ([5, 35] and 7.1 % prevalence for aneurysms in branches of the coeliac axis [20]. Coeliac trunk aneurysms (CTRA) have been reported to be associated with abdominal aortic aneurysms [24], which is consistent with our data. In contrast to recent reports, we noted a strong predominance of men (95.7 %) in these cases [29]. Also in contrast to the literature, our analysis detected 18.6 % CTRAs; however, most of these were characterized as degenerative lesions or poststenotic dilatation of the coeliac trunk. Only one CTRA was indicated for treatment. Stenosis is an often-described risk factor for the development of VAA of the coeliac trunk arteries and SMA [4, 23, 29, 36–39], which is supported by our data. RAAs also were included in our analysis; the incidence of RAAs in our study was higher than that reported in the literature [21]. RAAs seem to be associated with fibromuscular dysplasia and medial degeneration. Hypertension is reported to be another risk factor for RAA [8, 24, 40] and was evident in 63.6 % of our patients.
The favoured interventional treatment modalities for VAA include transcatheter embolization and stent grafting [24, 41]. In our analysis, embolization was performed with either pushable coils, detachable coils, glue embolic fluid, or combinations thereof, at the discretion of the investigators. Onyx liquid embolization had not yet been introduced for peripheral indications at our institution at that time. The stent grafts used were provided by various companies and were employed based on the location of the VAA, the size required, and the personal experience of the investigator. Flow diverter stents might have served as an alternative in particular cases, but they had also not yet been introduced at our institution. In contrast to open surgery, interventional procedures are normally performed under local anaesthesia, with high technical success rates [4, 20, 23, 34, 41], low complication rates, and shorter hospital stays [31, 42]. Reported complications include technical failure to catheterize the artery [43], arterial thrombosis or embolism resulting in organ infarctions or abscesses, coil migration, aneurysm recurrence, and a haematoma or a pseudoaneurysm at the arterial puncture site [24, 27, 30, 41, 44]. Our data analysis yielded a technical success rate of 93.3 % (42 of 45 aneurysms). Technical failures included one case with migration of a covered stent in an RAA, which was treated with subsequent coil embolization. In another case, coil embolization of a false RAA resulted in an incomplete occlusion, which required reintervention. In the third case, elective coil embolization of an SAA presented some coil migration, with consequent ischaemia of the spleen and pancreas.
There was a complication rate for interventional treatment of 13.3 % (four complications in 30 patients) in emergency cases compared to 10 % (one complication in ten patients) in elective cases. Rebleeding as a late procedural failure occurred most frequently after coil embolization. There was no mortality in elective cases but a 30-day mortality of 6.7 % in emergency cases after interventional treatment, with one case of intracerebral bleeding and one patient with right heart failure after rebleeding. This is very low in comparison to other series published [4, 5, 34], only Balderi et al. [26] presented a 30-day mortality comparable to ours. Our data are, however, not suitable to achieve a comparative outcome analysis after surgical and interventional treatment. While most surgical patients received an elective operation, the majority of emergency cases were treated by means of interventional techniques. Moreover, the number of surgical cases was too small to reliably draw comparative data with respect to 30-day mortality or complication rates. The retrospective analysis of the practiced interdisciplinary decision making and the acceptable complication rates as reported above give the impression that the interventional treatment options are the treatment of choice both, in emergencies as well as in elective cases.
In conclusion, diagnoses of VAA may have increased because of increasing numbers of cross-sectional imaging studies; the incidence of SAAs was highest. We also observed significant numbers of aneurysms of the coeliac trunk arteries and renal artery, which suggests that these VAAs may be currently underdiagnosed. The mean diameter of ruptured aneurysms did not significantly differ from that of non-ruptured aneurysms. Thus, treatment indications should not be based primarily on the aneurysm diameter, but in the first instance on the aneurysm aetiology. Pseudoaneurysms need emergency treatment. The vast majority of true aneurysms can probably be managed conservatively; however, there might be some potential for fatality due to secondary aneurysm rupture.
Abbreviations
- VAA:
-
Visceral artery aneurysm
- SAA:
-
Splenic artery aneurysm
- HAA:
-
Hepatic artery aneurysm
- SMAA:
-
Superior mesenteric artery aneurysm
- CTRA:
-
Coeliac trunc aneurysm
- GDAA:
-
Gastroduodenal artery aneurysm
- PDAA:
-
Pancreaticoduodenal artery aneurysm
- RAA:
-
Renal artery aneurysm
- GAA:
-
Gastric artery aneurysm
- CT:
-
Computed tomography
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Acknowledgments
This work contains data from the doctoral thesis of Ms. Evelyn Dappa. The scientific guarantor of this publication is M.B.Pitton. The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional Review Board approval was not required because of the retrospective and observational nature of the analysis. Written informed consent was not required for this study because this is a retrospective and observational analysis. No study subjects or cohorts have been previously reported. Methodology: retrospective, observational, performed at one institution.
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Pitton, M.B., Dappa, E., Jungmann, F. et al. Visceral artery aneurysms: Incidence, management, and outcome analysis in a tertiary care center over one decade. Eur Radiol 25, 2004–2014 (2015). https://doi.org/10.1007/s00330-015-3599-1
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DOI: https://doi.org/10.1007/s00330-015-3599-1