1. No category

대한내과학회지: 제 88 권 제 5 호 2015
http://dx.doi.org/10.3904/kjm.2015.88.5.560
무증상의 빈혈로 발현된 상장간막동맥 거짓동맥류 파열 1예
아주대학교 의과대학 소화기내과학교실
김주성·진우람·이길호·황수현·이연경·임기현·임선교
Rupture of a Superior Mesenteric Artery Pseudoaneurysm Presenting with
Asymptomatic Anemia
Joo-Sung Kim, U-Ram Jin, Gil-Ho Lee, SuHyun Hwang, YeonKyung Lee, Kihyun Lim, and Sun Gyo Lim
Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea
Anemia is a common cause of referrals to gastroenterologists. Only a small number of anemia cases result from vascular
abnormalities. Visceral artery aneurysms and pseudoaneurysms are rare forms of vascular disease that have significant potential for
rupture, resulting in potentially life-threatening hemorrhaging. We present the case of a 70-year-old female patient with a pseudoaneurysm of the superior mesenteric artery complicated with rupture, who had no abdominal pain and only anemia. (Korean J Med
2015;88:560-563)
Keywords: Mesenteric artery, Superior; Pseudoaneurysm; Anemia
INTRODUCTION
with confirmed anemia, unless there is a history of significant
overt non-gastrointestinal blood loss. If no obvious lesions are
Blood loss from the gastrointestinal tract is the most common
detected by esophagogastroduodenoscopy and colonoscopy, eval-
cause of anemia in adult men and postmenopausal women.
uation of the small-bowel by video capsule endoscopy or en-
Other causes of anemia include intestinal malabsorption, as in
teroscopy should also be considered in patients with symptoms
celiac disease, gastrectomy, or gastric atrophy through achlorhy-
suggestive of small bowel disease. However, in some cases, the
dria, and Helicobacter pylori infection. A small subset of ane-
causes of anemia are not detected by an endoscopic examination
mia is caused by vascular abnormalities.
alone.
An endoscopic evaluation should be considered in patients
Visceral artery aneurysms and pseudoaneurysms are vascular
Received: 2014. 7. 15
Revised: 2014. 8. 18
Accepted: 2014. 10. 25
Correspondence to Sun Gyo Lim, M.D.
Department of Gastroenterology, Ajou University School of Medicine, 164 World cup-ro, Yeongtong-gu, Suwon 443-380, Korea
Tel: +82-31-219-6939, Fax: +82-31-219-5999, E-mail: [email protected]
*
Conflict of Interest: The authors disclose no potential conflicts of interest.
Copyright ⓒ 2015 The Korean Association of Internal Medicine
This is an Open Access article distributed under the terms of the Creative Commons Attribution
- 560 - Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits
unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
－ Joo-Sung Kim, et al. Anemia by rupture of SMA pseudoaneurysm －
3
abnormalities that cannot be detected readily by routine endo-
186,000/mm and prothrombin time was 15.1 s (international nor-
scopic examinations. In addition, diagnosis of vascular diseases is
malized ratio [INR] = 1.43). On routine chemistry, total pro-
more difficult because patients do not have predisposing symp-
tein/albumin was 5.2/2.4 g/dL, AST/ALT was 8/5 IU/L, total bi-
toms in most cases. Thus, the condition of patients with these
lirubin was 0.2 mg/dL, and alkaline phosphatase was 55 IU/L.
vascular abnormalities can quickly become life-threatening due
Due to the severe anemia, packed red blood cells (RBCs)
to the sudden rupture of an aneurysm or pseudoaneurysm [1,2].
were transfused. After the transfusion, hemoglobin was elevated
We report a case of a 70-year-old female with a ruptured
to 11.4 g/dL. However, it decreased to 7.6 g/dL after 15 h.
pseudoaneurysm of the superior mesenteric artery (SMA), which
To investigate the possibility of gastrointestinal bleeding,
was diagnosed with an abdominal contrast-enhanced computed
esophagogastroduodenoscopy and sigmoidoscopy were performed.
tomography (CT) scan and treated by angiographic emboliza-
However, we found nothing that would suggest gastrointestinal
tion.
bleeding.
In addition, a contrast-enhanced CT scan was performed to
find the cause of the bleeding. The scan revealed an -1.3 cm
CASE REPORT
pseudoaneurysm of the SMA, in addition to a hematoma and
A 70-year-old female patient was admitted to the hospital
hemoperitoneum due to the ruptured pseudoaneurysm (Fig. 1).
with mild dizziness. The patient had hypertension. She regularly
Angiography for SMA was performed with access to the right
took a calcium channel blocker and an angiotensin receptor
femoral artery. A pseudoaneurysm was found in a branch of the
blocker. Her blood pressure was known to be well-controlled
SMA (Fig. 2).
according to her family, although exact information about her
The main feeding vessel was selected by microcatheter, and
blood pressure before admission was not provided. She had no
a selective embolization with glue was performed at a feeding
specific familial medical history, or any trauma or surgical
vessel and the pseudoaneurysm. After embolization, the blood
history. The patient did not have any symptoms to suggest gas-
supply to the pseudoaneurysm was blocked, which was con-
trointestinal bleeding.
firmed angiographically (Fig. 3).
On physical examination, her blood pressure was 123/67
The patient’s blood pressure was 123/67 mmHg when she
mmHg and heart rate was 69/min. Body temperature was 36.6℃.
came to the hospital. During admission, her blood pressure was
The mental status of the patient was alert and her conjunctivas
were pale. Lung sounds were clear and heartbeat was regular.
Bowel sound was normoactive. There was no direct or rebound
abdominal tenderness. A Levine tube was inserted into the patient’s stomach and irrigation with normal saline was performed.
The color of saline after recovery through the Levin tube was
clear. On digital rectal examination, no mass lesion was palpable and the color of the stool was normal. The hydrogen peroxide (H2O2) response of the patient’s stool was normal. A fecal
occult blood test was not performed.
On a complete blood count, the white blood cell (WBC) was
3
8,600/mm (neutrophils 77.5%, lymphocytes 17.1%, monocytes
4.5%, eosinophils 0.5%), and hemoglobin and hematocrit were
3.7 g/dL and 11.5%, respectively. The platelet count was
Figure 1. Initial CT finding of superior mesenteric artery pseudoaneurysm. Initial CT scan shows a -1.3 cm pseudoaneurysm
at the superior mesenteric artery branch (arrow) and hemoperitoneum in the abdominopelvic cavity (due to the pseudoaneurysmal rupture). CT, computed tomography.
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－ 대한내과학회지: 제 88 권 제 5 호 통권 제 657 호 2015 －
Figure 2. Angiographic finding of the superior mesenteric artery.
Selective angiogram shows a pseudoaneurysm of superior mesenteric artery branch (arrow).
kept stable. After the embolization, the level of hemoglobin was
above 10.0 g/dL without additional bleeding signs. At 7 days after embolization, the patient was discharged.
The patient was followed-up at 2 weeks and 6 weeks after
Figure 3. Angiographic findings after transcatheter embolization. After embolization of superior mesenteric artery branch,
the pseudoaneurysm was no longer seen on the angiography.
discharge. No bleeding event or abdominal symptom suggestive
pseudoaneurysms are diverse, and include surgical injuries, ab-
of bowel ischemia occurred. The level of hemoglobin was main-
dominal trauma, chronic pancreatitis, atherosclerosis, medial ne-
tained above 10.0 g/dL. However, a follow-up CT scan could
crosis, collagen vascular disease, arteritis, vascular dissections,
not be performed, because the patient did not revisit our clinic.
and infection [4]. Most patients are asymptomatic prior to rup-
We had a telephone interview with her family 12 weeks after
ture, and diffuse abdominal pain may be the only symptom of
discharge; no additional bleeding event had occurred.
the ruptured pseudoaneurysm. It is important that more than
50% of visceral artery aneurysms present acutely with rupture
and show a mortality rate of about 10-25% [3]. Our patient
DISCUSSION
showed severe anemia with no evidence of overt gastrointestinal
An aneurysm is defined as pathological dilation of a segment
bleeding or abdominal pain. Vital signs were stable during ad-
of a blood vessel. Visceral artery aneurysms include both true
mission, although the SMA pseudoaneurysm had already rup-
aneurysms and pseudoaneurysms. In true aneurysms, all three
tured. Thus, it was difficult to diagnose initially. In addition,
layers of the arterial wall are intact, whereas pseudoaneurysms
there was no predisposing factor for SMA pseudoaneurysm in
lack a complete arterial wall. Visceral artery aneurysm is a rare
our patient. We assume that atherosclerosis or medial degener-
disease; the incidence in postmortem studies range from 0.01%
ation of the artery could have caused our patient’s SMA pseu-
to 0.2% [3]. The incidence of visceral artery pseudoaneurysms
doaneurysm.
is even rarer, accounting for about 5% of all visceral artery
A CT scan can be an excellent method in the differential di-
aneurysms [4]. SMA aneurysms or pseudoaneurysms are the
agnosis of SMA pseudoaneurysms. Specifically, a CT scan
third most common visceral artery aneurysm (splenic and celiac
should be considered in patients with unidentifiable causes of
artery aneurysms occur more frequently). The causes of SMA
anemia after other diagnostic methods fail to identify a cause.
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－ 김주성 외 6인. 상장간막동맥의 거짓동맥류 파열 －
Angiography is considered the gold standard for the diagnosis
SMA pseudoaneurysmal rupture can occur even in patients
of aneurysms. Other associated vascular anomalies can also be
without risk factors or symptoms, such as abdominal pain. Thus,
revealed by angiography [5]. Endovascular techniques can be
patients need to be evaluated with abdominal CT scans or an-
used to treat most visceral artery aneurysms regardless of the
giography, even if asymptomatic anemia is the only evidence of
clinical presentation, etiology, and location of the aneurysm.
an SMA pseudoaneurysmal rupture.
Endovascular treatment is also indicated for ruptured visceral artery aneurysms in hemodynamically stable patients, especially
중심 단어: 상장간막 동맥; 거짓동맥류; 빈혈
when the aneurysm is poorly accessible for surgical treatment or
when operative risks are high [6].
REFERENCES
Recently, many studies on stent insertion in SMA pseudoaneurysms have been reported. McGraw et al. [7] reported the
successful use of an autogenous vein-covered stent for management of an SMA pseudoaneurysm. Gandini et al. [8] reported
an emergency endovascular treatment of giant SMA pseudoaneurysm using a polytetrafluoroethylene-covered nitinol stent.
There is no definite superiority between embolization and stent
insertion. We decided to treat the superior mesenteric artery
pseudoaneurysm with an endovascular technique. However, embolization is feasible only in the case of small pseudoaneurysms,
because treatment of large ones requires the use of large
amounts of embolizing material for the complete occlusion of
the affected vessel [8]. In addition, embolization is not believed
to be appropriate in a case of a wide-neck pseudoaneurysm [9].
The main limitations to endovascular treatment are the availability of facilities for emergency treatment and the risk of failure due to difficulty in achieving selective catheterization [6].
Open surgery for SMA pseudoaneurysms is often rendered difficult by the underlying cause of the psuedoaneurysm (such as
pancreatitis), anesthesia in an unstable patient, or by adhesions,
which increase the risk of failure [10].
In our case, an abdominal contrast-enhanced CT scan revealed a ruptured SMA pseudoaneurysm and hemoperitoneum.
Angiography definitively diagnosed the disease and the patient
was treated with transcatheter embolization. Subsequently, no
bleeding from the ruptured pseudoaneurysm was observed and
no procedure-related complications were apparent. Following the
procedure, the patient stabilized and we concluded that the de-
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Surg 2004;18:695-703.
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Autogenous vein-covered stent for the endovascular management of a superior mesenteric artery pseudoaneurysm. J
Vasc Interv Radiol 1998;9:779-782.
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using a nitinol stent-graft. Cardiovasc Intervent Radiol
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9. Cowan S, Kahn MB, Bonn J, et al. Superior mesenteric artery pseudoaneurysm successfully treated with polytetrafluoroethylene covered stent. J Vasc Surg 2002;35:805-807.
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creased hemoglobin and hematocrit were due to the ruptured
SMA pseudoaneurysm and not gastrointestinal bleeding.
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