{'fraction_non_alphanumeric': 0.03011572856391373, 'fraction_numerical': 0.01170436612309311, 'mean_word_length': 5.466836734693878, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 1, 'https://': 1, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A case report of critical ischemic stroke in moyamoya-like vasculopathy accompanied by systemic lupus erythematosus

A large spectrum of inherited or acquired systemic diseases and conditions can occur in conjunction with progressive bilateral stenosis or occlusion of the major intracranial arteries, particularly within the circle of Willis. In addition, prominent development of pathological collateral circulation can be observed in the vicinity of steno-occlusive changes in these patients. This pathologic condition related to systemic conditions is known as moyamoya-like vasculopathy (MMV) [1]. MMV can develop in association with autoimmune disorders; several cohorts have reported a higher prevalence of autoimmune diseases in MMV than in the general population [2]. The clinical features and prognosis of MMV accompanied by autoimmune disease are unknown, and it is challenging to determine treatment in clinical practice. In this article, we reA case report of critical ischemic stroke in moyamoya-like vasculopathy accompanied by systemic lupus erythematosus Wooseong Jeong, Gil Myeong Seong, Jung-Hwan Oh, Jay Chol Choi, Joong-Goo Kim Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea Department of Neurology, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea Case Report pISSN 2765-4559 eISSN 2734-1461 encephalitis [Epub ahead of print] https://doi.org/10.47936/encephalitis.2021.00150

without significant mural enhancement in the stenotic segment. Characteristics of the stenotic segment showed relatively concentric, nonremodeled lesions, without T2 wall high-signal intensity (Figure 2A-C). The patient also was diagnosed with SLE based on photosensitivity, thrombocytopenia, high titers of antinuclear antibody (ANA; 1:1,280) and anti-double-stranded DNA (anti-dsDNA) (80 IU/mL), and decreased complement 3 (C3). Aspirin and a statin were administered after diagnosis of TIA associated with MMV. The RNF213 gene was negative. Evaluation for antiphospholipid syndrome, such as testing for lupus anticoagulant, anticardiolipin antibodies, and anti-beta2-glycoprotein antibodies, was negative. The SLE disease activity index score was 4 (mild activity), so we decided to follow up with hydroxychloroquine.
Fortunately, extensive territorial infarct did not advance to severe hemorrhagic transformation or brain swelling. Ninety days later, the patient's motor power in the upper and lower

Discussion
This patient satisfied the Systemic Lupus International Collaborating Clinics criteria for a diagnosis of SLE, with a clinical spectrum disorder characterized by photosensitivity, thrombocytopenia, and an array of immunological abnormalities [3]. Cerebrovascular disease has been reported in 15% to 19% of patients with SLE [4,5]. The incidence ratio of stroke in patients with SLE was significantly higher than in the general population [5]. Among patients with SLE, baseline disease activity, hyperlipidemia, and hypertension are risk factors for cerebrovascular disease [5]. However, about 50% of cases of cerebrovascular disease in patients with SLE showed no evidence of increased disease activity [6]. About 40% of symptomatic large-vessel steno-occlusive disease in SLE resulted in poor outcomes [6], but there are few reports of an association between SLE and MMV.
The precise pathomechanism for MMV associated with SLE is unclear. In contrast to MMV, in vasculitis related to SLE, multiple vascular changes were observed in relatively small-diameter vessels. This case showed localized stenosis and characteristic development of collateral circulation around the circle of Willis. Thus, it can be assumed that the pathophysiology of our case is different from that caused by vasculitis related to SLE flare. Similar to our case, Kim et al. [7] reported high-resolution MRI findings that MMV was associated with smaller diameter and concentric stenosis compared with symptomatic atherosclerotic lesion. Most imaging patterns of acute ischemic stroke in patients with SLE and MMV were predominantly embolic type [8,9]. A characteristic finding in our case is an embolic pattern involving the whole territory despite ongoing stenosis. This pattern can be distinguished from the atherosclerotic occlusion pattern and is presumed to be due to rapid progression of steno-occlusion and poor development of collateral flow. Positivity for serum autoantibodies has been reported in patients with MMV, suggesting an autoimmune component in its pathogenesis [2]. Our case had no significant underlying vascular risk factors of cerebrovascular disease, such as high lupus activity, hypertension, diabetes mellitus, or hyperlipidemia. Thus, it was challenging to establish an optimal strategy for predicting and preventing disease progression. There was no evidence to support whether medical or surgical treatment would be effective for cerebrovascular disease in SLE-related MMV. In previous reports, immunosuppression indicates an effect for patients with high SLE activity, but proper drug selection and duration of treatment are unclear for MMV-related SLE [10,11]. Surgical management of MMV might prevent ischemia by restoring and enhancing cerebral blood flow [12]. However, several reports have shown successful disease control with only medical treatment [11]. There are no clear and definite criteria for surgical treatment in MMV. In our case, medical rather than surgical management was chosen because the patient experienced only one event of TIA and showed a stable clinical course for three months. Additionally, there was no significant evidence of SLE flares such as fever, erythema, arthritis, or laboratory abnormalities, and we could not properly assess SLE activity due to severe neurologic dysfunction. Also, vessel-wall evaluation was performed with high-resolution vessel-wall MRI when the patient first visited the hospital. Although previous studies have shown that high-resolution vessel-wall MRI can help differentiate the cause of vasculopathy [13,14], it has not been used to evaluate disease activity or predict prognosis as shown in our case.
However, medical treatment for our patient failed, and fatal On axial (A), coronal (B), and sagittal (C) T2 vessel-wall magnetic resonance imaging at 3 months prior, the left middle cerebral arteries territory infarction shows severe stenosis without significant wall thickening or vascular remodeling proximal to the level of stenosis (white arrows).

A B C
cerebral infarction with severe residual sequelae occurred three months after the first symptom. Although high-resolution MRI was used to evaluate the characteristics of intracranial stenosis diagnosed at the first TIA, it did not help predict progression to occlusion. Mikdash et al. [5] reported that stroke in SLE patients might be more severe than in non-SLE controls. In a prospective cohort study, about 77% of patients with stroke exhibited National Institutes of Health Stroke Scale > 6. Additionally, individuals with SLE have a lower rate of survival after stroke compared to the general population [15].
In conclusion, it is important to recognize early progression in patients who have MMV with coexisting autoimmune diseases such as SLE. Surgical treatment should be considered for patients with MMV with lupus who had symptomatic eloquent location stenosis resulting in a critical impact on clinical outcome and quality of life.

Conflicts of Interest
No potential conflict of interest relevant to this article is reported.