20 February 2018: Articles 
Ruptured Cystic Artery Pseudoaneurysm Successfully Treated with Urgent Cholecystectomy: A Case Report and Literature Review
Management of emergency care, Rare disease
Yuji Fujimoto BCDEF 1, Yoshito Tomimaru ABCDEF 1*, Hisanori Hatano D 1,2, Kozo Noguchi F 1, Hirotsugu Nagase D 1, Atsushi Hamabe F 1, Masashi Hirota D 1, Kazuteru Oshima F 1, Tsukasa Tanida D 1, Shunji Morita F 1, Hiroshi Imamura D 1, Takashi Iwazawa F 1, Kenzo Akagi D 1, Keizo Dono BCDEF 1DOI: 10.12659/AJCR.907273
Am J Case Rep 2018; 19:187-193
Abstract
BACKGROUND: Cystic artery pseudoaneurysm is rare, and some cases are associated with inflammation of the gallbladder. There is limited information regarding this condition, and the clinical features remain unclear. This report is a case of ruptured cystic artery pseudoaneurysm diagnosed by computed tomography (CT) imaging and treated with urgent cholecystectomy and is supported by a literature review of previous cases.
CASE REPORT: A 90-year-old man, who had developed acute cholecystitis due to a gallstone one month previously, was referred to our hospital. He developed fever and epigastric pain while waiting for a scheduled elective cholecystectomy. Laboratory investigations showed elevated markers of inflammation and elevated hepatobiliary enzyme levels. Computed tomography (CT) imaging showed cholecystitis and pseudoaneurysm of the cystic artery. The pseudoaneurysm had ruptured and was accompanied by the formation of a hematoma within the gallbladder that involved the liver bed. Having made the preoperative diagnosis, an urgent open laparotomy was performed, during which the gallbladder was found to have perforated. The hematoma penetrated into the liver bed. Cholecystectomy was performed, and the pseudoaneurysm of the cystic artery was extirpated. There were no serious postoperative complications. A literature review identified 50 previously reported case of cystic artery pseudoaneurysm.
CONCLUSIONS: A case of ruptured cystic artery pseudoaneurysm, successfully treated with urgent cholecystectomy is reported, supported by a literature review of previous cases and characterization of the clinical features of this rare condition.
Keywords: Aneurysm, False, Aneurysm, Ruptured, Cholecystitis, gallbladder diseases
Background
Cystic artery pseudoaneurysm is rare, and some cases are associated with inflammatory processes in the gallbladder. Although the pathogenesis of cystic artery pseudoaneurysm remains unclear, it is likely that the artery is eroded by inflammation of the arterial wall, resulting in damage to the adventitia, with localized weakness in the vessel wall and formation of a pseudoaneurysm [1].
Acute or chronic cholecystitis associated with cholelithiasis are common diseases of the gallbladder. The relationship between inflammation of the gallbladder and cystic artery pseudoaneurysm might suggest that the latter occurs more frequently. However, although the incidence of cystic artery pseudoaneurysm is unclear, it is a rare condition when compared with the common incidence of cholecystitis. Therefore, studies into the etiology and pathogenesis of cystic artery pseudoaneurysm have been limited. Although cases of cystic artery pseudoaneurysm can be associated with surgical procedures that involve the biliary tract, including cholecystectomy, the mechanism of the formation of arterial pseudoaneurysm is likely to be traumatic, and different from cystic artery pseudoaneurysm associated with cholecystitis.
From a review of the published literature, there have been only 50 previously reported cases of cystic artery pseudoaneurysm associated with cholecystitis. There is limited information regarding this condition, and the clinical features remain unclear. Further studies of cases of cystic artery pseudoaneurysm associated with cholecystitis are needed to characterize the condition and evaluate the optimum management.
This report is of a case of ruptured cystic artery pseudoaneurysm diagnosed by computed tomography (CT) imaging and treated with urgent cholecystectomy and is supported by a literature review of previous cases.
Case Report
One month before hospital admission, a 90-year-old man developed acute cholecystitis associated with a gallstone and was referred to our hospital for planned elective cholecystectomy. His past medical history included prior myocardial infarction and sick sinus syndrome. He had a cardiac pacemaker and was prescribed antithrombotic drugs (aspirin 100 mg/day, and clopidogrel 75 mg/day) and was categorized as New York Heart Association (NYHA) Class II [2]. Computed tomography (CT) imaging showed a gallstone measuring 29 mm in diameter within the gallbladder. An elective laparoscopic cholecystectomy was scheduled, and the antithrombotic drugs were replaced by unfractionated heparin during the perioperative period, with the intention of resuming his routine antithrombotic drug medication following hospital discharge.
Twelve days before his scheduled hospitalization, he suddenly developed fever and epigastric pain while waiting for surgery. On admission to hospital, physical examination showed that his temperature was 38.8°C, his blood pressure was 101/61 mmHg, and his heart rate was 90 bpm with epigastric and right upper quadrant tenderness on abdominal palpation.
Laboratory investigations showed increased leukocytes at 20,700/μL (normal range, 3,500–8,500/μL) and C-reactive protein (CRP) of 3.33 mg/dL (normal range, <0.3 mg/dL). Hepatobiliary enzymes were elevated as follows: aspartate aminotransferase (AST) 1,413 U/L (normal range, 10–37 U/L), alanine aminotransferase (ALT) 883 U/L (normal range 4–40 U/L), alkaline phosphatase (ALP) 1392 U/L (normal range, 98–328 U/L), γ-glutamyltransferase (GGT) 313 U/L (normal range, 11–64 U/L), total bilirubin 2.05 mg/dL (normal range, 0.2–1.2 mg/dL), direct (conjugated) bilirubin 1.19 mg/dL (normal range, 0–0.3 mg/dL).
Imaging was performed using computed tomography (CT), which showed an area of high density within the gallbladder and common bile duct, suggesting intraluminal bleeding and hematoma (Figure 1A). Inflammation of the fat (fat necrosis) surrounding the gallbladder was present on imaging, in keeping with acute cholecystitis. Contrast-enhanced CT imaging also showed that there was spread of the hematoma into the liver bed (Figure 1B, 1C.). There was an 8 mm diameter nodular lesion associated with the cystic artery, which showed the same degree of contrast-enhancement as the aorta (Figure 1C), which had not been seen in the previous CT, one month previously. The lesion was confirmed to be associated with the cystic artery by three-dimensional CT angiography (Figure 1D), and was diagnosed as a ruptured pseudoaneurysm.
Even with acute cholecystitis and ruptured pseudoaneurysm accompanying hemobilia and spread of the hematoma into the liver bed, the patient was hemodynamically stable. However, because of the potential risk of severe infection associated with cholecystitis and the possibility of hemorrhagic shock due to bleeding, an urgent open cholecystectomy was planned. At the time, he was classified as American Society of Anesthesiologists (ASA) physical status (ASAPS) Class 3E [3].
During surgical laparotomy, the gallbladder was inflamed, perforated, and was found to be adherent to the surrounding tissue. Following dissection of the adhesions, the hematoma was found to involve the liver bed. The gallbladder was opened, and the lumen of the gallbladder contained hemorrhage and hematoma, and there was spread of the hematoma into the liver bed (Figure 2). There was no intraperitoneal bleeding. Following identification of the cystic artery and cystic duct, both were ligated. Cholecystectomy was performed, and the pseudoaneurysm of the cystic artery was extirpated. The operation time was 134 minutes, and the intraoperative blood loss was 540 ml. Histopathological examination of the resected gallbladder specimen showed acute on chronic cholecystitis. The patient had no serious postoperative complications, but required postoperative rehabilitation to regain mobility, and was transferred to a rehabilitation hospital on the fourth postoperative day.
Discussion
A rare case of ruptured cystic artery pseudoaneurysm, successfully treated with urgent cholecystectomy, has been reported. The development of cystic artery pseudoaneurysm is associated with gallbladder inflammation. Review of the literature does not provide details of the exact incidence of this association, but from the low number of previously published cases reports, the incidence is low when compared with the frequency of cholecystitis.
It has been hypothesized that cystic artery pseudoaneurysm is masked by the inflammation associated with cholecystitis that promotes the formation of both the pseudoaneurysm and the hematoma formation [4]. However, the clinical features of cystic artery pseudoaneurysm have not been comprehensively investigated because of the low incidence. We report a recent case in the hopes of better characterizing this rare disease.
A literature search of the Medline database, up to April 2017, for cases of cystic artery pseudoaneurysm, extracted cases in which the term ‘cystic artery pseudoaneurysm’ was given as the diagnosis. In the literature review, cases in which cystic artery pseudoaneurysm developed following surgical procedures, such as cholecystectomy, were excluded because the formation of the pseudoaneurysm in these cases may be related to the surgery itself [5]. As a result, to the best of our knowledge, 50 cases of cystic artery pseudoaneurysm have been previously published [1,4,6–49]. The clinical features of the previously published 50 cases, and the current case, are shown in Table 1.
When compared with the identified previous 50 cases, the case of cystic artery pseudoaneurysm that we report was unique in several ways. This case was unique in that the age of the patient was the oldest case of cystic artery pseudoaneurysm ever reported, as the patient was 90 years old; the age range of the previously published cases was 32–90 years, with a median age at diagnosis of 68 years. Also, in this reported case, the spread of the hematoma into the liver bed without intraperitoneal bleeding was rarely reported in previous cases. Even with acute cholecystitis and ruptured pseudoaneurysm accompanying hemobilia and spread of the hematoma, this patient was hemodynamically stable. However, he had a potential risk of severe infection and hemorrhagic shock due to the bleeding. Therefore, due to the potential life-threatening clinical status of the patient in this report, curative surgery was considered to be urgently required. A shorter operation time was given priority when choosing a surgical procedure because of the potential for hemodynamic destabilization. Therefore, open cholecystectomy was chosen instead of laparoscopic cholecystectomy.
However, because techniques and devices for laparoscopic surgery continue to develop, in the recent literature, laparoscopic cholecystectomy has been indicated for the surgical management of previous cases of cystic artery pseudoaneurysm when the patients were clinically stable. Review of the literature has confirmed that cystic artery pseudoaneurysm formation is associated with inflammation of the gallbladder, and ruptured cases are more common than unruptured cases. Our case indicates that ruptured cystic artery pseudoaneurysm can lead to spread of the hematoma into the liver bed. A literature review of the relationship between pseudoaneurysm formation and antithrombotic drugs has shown that there have been few reports of this association.
Conclusions
A case of ruptured cystic artery pseudoaneurysm, successfully treated with urgent cholecystectomy is reported, supported by a literature review of previous cases and characterization of the clinical features of this rare condition. This case report contributes to the better characterization of the clinical features of this rare and poorly understood condition.
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