Abstract
Background: Multiple splenic artery aneurysms (MSAAs) are rare and there are few reports about their treatment. We herein present a rare case of MSAAs treated with splenectomy combined with endovascular embolization.
Methods: A 51-year-old female patient was incidentally diagnosed with MSAAs. Splenectomy combined with endovascular embolization was the chosen treatment.
Outcomes: The patient recovered uneventfully and was discharged from the hospital 5 days after splenectomy. The patient has been doing well during the 27-months of follow-up.
Conclusion: Combined with the experience of the previous literature, we think splenectomy combined with endovascular embolization is a safe, reliable and minimally invasive treatment for some selected multiple SAAs, depending on several patient parameters, such as the age, sex, aneurysm dimension, aneurysm location, complications, and severity of the clinical findings.
Introduction
Splenic artery aneurysm (SAA) is the most common visceral aneurysm. It comprises about 60% of all visceral aneurysm cases and occurs predominantly in multiparous women and portal hypertension patients (1–3). The main risk factors for true SAAs are hypertension, atherosclerosis, liver cirrhosis, portal hypertension (PHT), liver transplantation, women, pregnancy and multiple pregnancies, with pregnancy and PHT being the most important risk factors (1, 2). The incidence of SAA was reportedly 7–50% in patients diagnosed as having cirrhosis and portal hypertension, and the incidence of PHT was reportedly 50% in SAA patients (1–5). Portal hypertension with SAA is common, whereas portal hypertension with multiple splenic artery aneurysms (MSAAs) is rarely. According to previous literatures, true MSAAs have an estimated prevalence rate of 0.02–0.1% (6). Despite the rarity of MSAAs, they are clinically important because their possible rupture may be catastrophic. Available methods for treatment of SAAs include endovascular, laparoscopic, and open surgery. However, the treatment of MSAAs is challenging for vascular surgeons. Herein we present a rare case of MSAAs treated with splenectomy combined with endovascular embolization and review the relevant literature.
Case Report
A 51-year-old female patient with a negative abdominal physical examination was admitted to our hospital for multiple splenic artery aneurysms incidentally detected because of her presentation of occasional pain in her left ribs. Her past medical history showed that she was previously diagnosed as having chronic hepatitis B. She did not have any history of a genetically inherited disease and had never undergone a surgery. She had a history of two pregnancies. Her initial lab test results showed a hemoglobin level of 117 g/L, red blood cell count of 3.64 × 1012/L, white blood cell count of 1.82 × 109/L, and platelet count of 20 × 109/L, whereas all other laboratory test results were normal. Subsequently, a computed tomographic angiography showed multiple aneurysms of the splenic artery, and the largest aneurysm was 4.6×3.5 cm (Figure 1). She was diagnosed with multiple splenic artery aneurysms, chronic hepatitis B, compensatory stage of liver cirrhosis, splenomegaly with hypersplenism, severe thrombocytopenia and portal hypertension. Considering the diameter of the aneurysms, the morphology of the aneurysms and splenomegaly with hypersplenism the treatment of aneurysmectomy plus splenectomy was obviously indicated. The patient has consented to the publication of the case details and images.
Figure 1
First, we performed endovascular embolization and subsequently monitored the patient's leukocyte and platelet counts. The selective splenic artery angiography confirmed the multiple aneurysms along splenic artery (Figure 1). Then, two of the larger aneurysms were selected for spring coil partial embolization, while the splenic hilum aneurysms and intra-splenic aneurysms were not treated. Meanwhile we also embolized the outflow tract of the largest aneurysm. The patient's postembolization angiogram showed that the blood flow in the aneurysmal sac had significantly reduced and slowed down (Figure 2). After-embolization, the patient also did not experience any complication, such as bowel ischemia, pain, or fever. On the 4th day after endovascular embolization, her CT scan showed thrombosis in the aneurysm sac (Figure 3). One week after endovascular embolization, her white blood cell count was 3.74 × 109/L and her platelet count was 72 × 109/L. Subsequently, we performed aneurysmectomy plus splenectomy without any blood transfusion during the process. The patient was not transferred to the intensive care unit. The patient's platelet count and white blood cell count normalized at 2 and 3 days after surgery, respectively. She recovered uneventfully and was discharged from the hospital 5 days after surgery. During her 6-months of follow-up, her platelet count remained normal and no adverse events occurred.
Figure 2
Figure 3
Discussion
SAAs are usually asymptomatic and diagnosed incidentally. Currently, the guidelines recommend treating non-ruptured splenic artery true aneurysms >3 cm, with a demonstrable increase in size, or with associated symptoms in patients of acceptable risk because of the risk of rupture (1 C)(7). MSAAs is rarely and the treatment was challenging. To the best of our knowledge, there are only 36cases previously reported in 25 English medical literatures to the date of writing in a search of PubMed, Google Scholar, and Google databases (Table 1).
Table 1
| References | # | Age(years) and sex | Possible etiology | Symptoms | Rupture | MD/ (mm) | Location | Intrasplenic/ hilum SAA | Treatment | Outcome/ Complication |
|---|---|---|---|---|---|---|---|---|---|---|
| Matter, (8) | 12 | NA | Liver cirrhosis PHT Hypertension Atherosclerosis Trauma | 2 cases: Cardiovascular collapse with acute abdominal pain 9 cases: symptomless | Yes: 2 cases No: 10 cases | 50 | Distal third of SA:8, middle third of SA:4 | NA | Splenectomy with splenic artery ligation:5, close follow-up: 7 | Lost follow-up: 1 died from ruptured SAAs: 2 survival: 9 No complication |
| Kitamura, (9) | 1 | 64y, F | Connective tissue abnormalities | Left upper quadrant pain | Yes | 31 | Distal third of SA | Yes | Splenectomy with aneurysmectomy | Survival/No |
| Cho, (10) | 1 | 54y, M | Trauma | Abdominal discomfort | No | 45 | Intrasplenic | Yes | Splenectomy | Survival/No |
| Juszkat, (11) | 1 | 60y, F | NA | Vague upper abdominal pain | No | 25 | Distal third of SA | Yes | Splenectomy with aneurysmectomy and coil embolization | Survive/No |
| Woo, (12) | 1 | 20y, M | Unknown | Flank pain | No | 16 | Distal third of SA | No | Splenectomy with splenic artery ligation | Survival/No |
| Ohmoto, (13) | 1 | 59y, F | Liver cirrhosis PHT | Symptomless | No | 24 | Distal third of SA | No | Coil embolization | Survival/No |
| Williamson, (14) | 1 | 71y, F | Liver cirrhosis PHT | Left upper quadrant pain and pulsating sensation | No | NA | NA | NA | Splenectomy with splenic artery ligation | Survival/No |
| Watada, (15) | 1 | 64y, M | FD | Right lower abdominal pain | No | 40 | Distal third of SA | Yes | Splenectomy with splenic artery ligation | Survival/No |
| Zubaidi, (16) | 1 | 42y, F | Multiple pregnancies | Left-sided abdominal pain lightheadedness vomiting hematemesis | Yes | 45 | Distal third of SA | Yes | Splenectomy with splenic artery ligation | Survival/No |
| Al-abbal, (4) | 1 | 70y, M | NA | Left upper quadrant pain | No | 40 | Proximal two- third of SA | No | Coil embolization | Survival/No |
| Phillips, (17) | 1 | 16y, M | Liver cirrhosis PHT | Symptomless | No | 43 | Distal third of SA | Yes | Close follow-up | Survival/No |
| Wang, (18) | 1 | 25y, F | NA | Left upper quadrant abdominal pain, fever duration | No | 35 | Distal two- third of SA | Yes | Splenectomy with splenic artery ligation | Survival/No |
| Manjunatha, (19) | 1 | 16y, F | PHT | Vague abdominal pain hematemesis abdominal mass | No | 18 | Distal third of SA | Yes | Splenectomy, aneurysmectomy and splenorenal shunt | Survival/No |
| Yakubovitch, 2013 (20) | 1 | 32y, M | PHT | Acute onset of epigastric pain | Yes | 25 | Distal two- third of SA | Yes | Splenectomy with aneurysmectomy and coil embolization | Survival/No |
| Aroor, (21) | 1 | 39y, F | FD | Abdominal discomfort duration | No | 58 | Distal third of SA | Yes | NA | Survival/No |
| Honda, (22) | 1 | 74y, F | Pneumococcal pneumonia infection | Acute right upper quadrant pain | No | 35 | Intrasplenic | Yes | Coil embolization respectively | Survival/No |
| Beksac, (6) | 1 | 23y, F | PHT | Symptomless | No | 70 | All segments | Yes | Aneurysmectomy with splenectomy | Survival/No |
| Bizueto, (23) | 1 | 66y, F | NA | Occasional abdominal pain | No | 90 | Distal third of SA | No | Aneurysmectomy with revascularization | Survival/No |
| Termos, (24) | 1 | 54y, F | Unknow | Left sided abdominal pain | No | 25 | Distal third of SA | No | Aneurysmectomy with splenectomy | Survival/No |
| Bagga, (25) | 1 | 40y, F | Liver cirrhosis PHT | NA | No | 20 | Distal two- third of SA | Yes | Close follow-up | Survival/No |
| Niu, (26) | 1 | 57y, F | Liver cirrhosis PHT | Symptomless | No | 27 | Distal two- third of SA | Yes | Coil embolization | Survival/No |
| Rehman, (27) | 1 | 22y, F | PHT | Left upper abdominal pain | No | 100 | Distal third of SA | Yes | Glue and coils embolization | Survival/No |
| Sakamoto, (28) | 1 | 36y, M | FD DLC | Symptomless | No | 110 | Distal two- third of SA | Yes | Splenectomy with distal pancreatectomy | Survival/No |
| Kawachi, (29) | 1 | 51y, F | IPHT | NA | No | 20 | Distal third of SA | Yes | Living donor liver transplantation and splenectomy | Survival/No |
| Selim, (30) | 1 | 39y, F | Trauma | NA | No | 15 | Distal third of SA | Yes | Coil embolization | Survival/No |
| Stoelting, (31) | 1 | 58y, F | Multiple pregnancies | Nausea, vomiting early satiety weight loss | No | 60 | Distal two- third of SA | Yes | Partial embolization and diagnostic splenectomy | Survival/No |
Clinical and treatment features of the reported cases of multiple splenic artery aneurysms.
MD, maximum diameter in multiple splenic artery aneurysms; NA, not available; FD, Fibromuscular dysplasia; PHT, portal hypertension; IPHT, Idiopathic portal hypertension; DLC, decompensated liver cirrhosis. # means number of patient.
Currently, several treatment methods exist for treating SAA, including endovascular, laparoscopic, and open surgery. In recent years, endovascular therapy has been favored for being minimally invasive, offering rapid postoperative recovery, and providing a high comfort level to patients. Several endovascular treatment methods for SAA, mainly include coil embolization, placement of covered stents, plug deployment, gluing, and injection of endoluminal thrombin, polyvinyl alcohol, particles, or gel foam (1, 2, 32, 33). Endovascular therapy is preferred in cases involving surgical technical difficulty and in patients with high risk of open operative. In addition, this option is considered for lesions located in the artery proximal and ruptured aneurysm (34). Endovascular treatment options, such as transcatheter embolization, stents graft, plug deployment and injection of endoluminal thrombin, polyvinyl alcohol, particles, or gel foam, for SAAs depend on the aneurysm's dimension, location and anatomical parameters. However, the application of this technique is limited by intrasplenic MSAAs, infected (mycotic) SAA, tortuous arteries, decreased artery dimensions, and the location of the lesion.In addition, giant aneurysm was not suitable for endovascular treatment, as the aneurysm may involve the intestine, pancreas, and other neighboring organs. Owing to the increasing frequency of endovascular treatment, its main complications, such as coil and stent migration, splenic and intestinal infarction, hemorrhage and aneurysm rupture, fever, and splenic abscess and recanalization, have begun to attract the attention of clinicians (35–38).
Despite rapid advances in minimally invasive surgery, open abdominal surgery remains the gold standard for treatment. Open/laparoscopic surgery aneurysmectomy with/without splenectomy is still suitable for patients with distally located, multiple SAAs, giant SAA, intrasplenic SAA, infectious SAA and elongated and tortuous SAA (1, 2, 39, 40). In addition, this method is also suitable for patients with failure of endovascular treatment, complications with endovascular treatment (e.g., splenic infarction and graft displacement.), severe splenic infarction, splenic abscess and abdominal dense adhesion (1, 2, 33, 40, 41). Surgical treatment often involves the spleen, pancreas and other adjacent organs, and distal pancreatectomy is necessary. This depends on the dimensions of the lesion, coexisting morbidities (pancreatitis, cirrhosis, or portal hypertension), and the experience of the team (1, 2). However, the mortality and morbidity of open/ laparoscopic surgery are higher than those of endovascular treatment. Moreover, compared with endovascular surgery, open/laparoscopic surgery has the disadvantages of being more invasive, offering slower postoperative recovery and causing patients greater inconvenience. Laparoscopic surgery can be the optimal treatment and is minimally invasive, particularly when compared with open surgery, specifically in early pregnancy with smaller lesions. However, it is not applicable for giant aneurysm and having dense adhesion with surrounding tissues. Laparoscopic revascularization was not recommended. Extensive experience in endoscopic surgery was a prerequisite. There was no laparoscopic surgery in our literature review.
Our case, was of a patient having MSAAs with a giant sac, an intrasplenic aneurysm and a splenic hilum aneurysm. Considering the risk of splenic infarction, vascular recanalization and intrasplenic aneurysm rupture after endovascular embolization or stent graft, open abdominal surgery was initially planned. However, a patient with severe thrombocytopenia and leukopenia is a bad fit for open surgery. The prognosis of such patients may be poor when open surgery is abruptly performed. Partial embolization of splenic vessels is reportedly used to treat hypersplenism of thrombocytopenia, and partial splenic embolization is an effective method for improving the platelet count (2, 42–45). Embolization is primarily performed in the inflow and outflow tracts of aneurysms, and it is not necessary to completely embolize the aneurysm sac. After comprehensive consideration, endovascular partial embolization aneurysm was performed in the first step to relieve the patient's thrombocytopenia and leukopenia. Then aneurysmectomy with splenectomy was performed in the second step. Considering the patient had a giant aneurysm sac, intrasplenic aneurysm, splenic hilum aneurysm, and multiple aneurysms, we finally chose open abdominal aneurysmectomy with splenectomy and the patient achieved good results.
There is not a single treatment method suitable for all splenic aneurysms. A combination of several treatment techniques may be necessary for some cases, particularly for giant SAAs or patients with comorbid conditions. Endovascular therapy, laparoscopic surgery and open surgery options should be chosen after careful consideration of the patient's condition, which depends on several patient parameters, such as the age, sex, aneurysm dimension, aneurysm location, complications, and severity of the clinical findings. At the same time, we should also pay attention to regular monitoring, particularly after endovascular treatment.
Conclusions
Endovascular treatment, laparoscopic surgery, and open surgery are important methods of treating SAAs. The preferred treatment of an individual patient and aneurysm must be carefully based on the particular anatomy and any associated clinical conditions as well as the underlying condition of the patient. For patients with multiple SAAs, particularly SAAs at the hilar or intrasplenic locations, and for those with more severe comorbidities, endovascular embolization combined with open surgery may be a good treatment choice.
Publisher's Note
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Statements
Data availability statement
The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author/s.
Author contributions
WC was the first authors and wrote the manuscript and was assistant in surgery. TW and DY was involved in editing the manuscript and assistant in surgery. JZ was chief operating surgeon. All authors contributed to the article and approved the submitted version.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Summary
Keywords
splenic artery aneurysms, splenectomy, aneurysmectomy, leukopenia, thrombocytopenia, endovascular embolization
Citation
Chen WC, Wang T, Yuan D and Zhao JC (2022) Multiple Splenic Artery Aneurysms: A Case Report and Review of the Literature. Front. Surg. 8:763890. doi: 10.3389/fsurg.2021.763890
Received
24 August 2021
Accepted
09 December 2021
Published
05 January 2022
Volume
8 - 2021
Edited by
Sami Akbulut, Inönü University, Turkey
Reviewed by
Tevfiktolga Sahin, Inönü University, Turkey; Cemalettin Koc, Inönü University, Turkey
Updates
Copyright
© 2022 Chen, Wang, Yuan and Zhao.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Ji Chun Zhao zhaojc3@163.com
This article was submitted to Vascular Surgery, a section of the journal Frontiers in Surgery
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.