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Miron I, Prună VM, Visarion DM, Petrescu GED, Gorgan RM. Natural History and Predictors for Hemorrhage in Supratentorial Brain Arteriovenous Malformations. J Clin Med 2024; 13:3760. [PMID: 38999325 PMCID: PMC11242268 DOI: 10.3390/jcm13133760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 06/21/2024] [Accepted: 06/24/2024] [Indexed: 07/14/2024] Open
Abstract
Background/Objectives: Approximately half of the patients harboring supratentorial brain arterio-venous malformations (stAVMs) present with hemorrhage, and another considerable proportion suffer from epileptic seizures. An important milestone in the management of this vascular pathology is acknowledging their natural history, especially across long periods of time. The aim of this study was to assess the predictive factors for hemorrhage and for epileptic seizures as presenting symptoms in stAVMs. Methods: We retrospectively analyzed patients with stAVMs admitted to our institution between 2012 and 2022 and evaluated predictive factors for hemorrhage and the risk factors associated with epileptic seizures. Results: The cohort included 169 patients, 78 of them (46.2%) presenting with intracerebral hemorrhage (ICH). Seventy-seven (45.5%) patients suffered from epileptic seizures. The annual hemorrhagic rate was 1.28%/year. Unruptured lesions (p = 0.001, OR 3.1, 95% CI 1.6-6.2), superficial venous drainage (p = 0.007, OR 2.7, 95% CI 1.3-5.7) and large nidus size (p = 0.025, OR 4, 95% CI 1.2-13.5) were independently associated with seizures. Among unruptured lesions, superficial venous drainage (OR 2.6, p = 0.036, 95% CI 1.06-6.3) and frontal/temporal/parietal location (OR 2.7, p = 0.040, 95 CI% 1.04-6.9) significantly increased the risk of seizures as a presenting symptom in multivariate analysis. Patients younger than 18 (p = 0.003, OR 4.5, 95% CI 1.6-12.2), those with AVMs < 3 cm (p = 0.03, OR 2, 95% CI 1.07-3.9) or those with deep located AVMs (p = 0.035, OR 2.3, 95% CI 1.06-5.1) presented statistically more often with ICH in multivariate regression. Small size (HR 1.8, 95% CI 1.09-3, p = 0.022) and exclusively deep venous drainage (HR 2.2, 95% CI 1.2-4, p = 0.009) were independent predictors for ICH, in time-dependent birth-to-diagnosis analysis. After shifting the birth-to-diagnosis curve by 10 years, unique arterial feeder demonstrated a positive correlation with ICH presentation as well. Conclusions: Small AVMs, those with exclusively deep venous drainage, unique arterial feeder or deep location may pose higher hemorrhagic risks for the patient, and therapeutic strategies should be tailored accordingly. When managing unruptured brain AVMs, it is important to consider the risk of developing seizures, in addition to the lifelong risk of hemorrhage, in determining the optimal treatment approach for each patient.
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Affiliation(s)
- Ioana Miron
- Department of Neurosurgery, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Department of Neurosurgery, "Bagdasar-Arseni" Clinical Emergency Hospital, 041915 Bucharest, Romania
| | - Viorel M Prună
- Department of Neurosurgery, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Department of Neurosurgery, "Bagdasar-Arseni" Clinical Emergency Hospital, 041915 Bucharest, Romania
| | - Dan M Visarion
- Department of Neurosurgery, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Department of Neurosurgery, "Bagdasar-Arseni" Clinical Emergency Hospital, 041915 Bucharest, Romania
| | - George E D Petrescu
- Department of Neurosurgery, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Department of Neurosurgery, "Bagdasar-Arseni" Clinical Emergency Hospital, 041915 Bucharest, Romania
| | - Radu M Gorgan
- Department of Neurosurgery, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Department of Neurosurgery, "Bagdasar-Arseni" Clinical Emergency Hospital, 041915 Bucharest, Romania
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Osuga K, Yamamoto K, Higashihara H, Juri H, Yamamoto K, Higashiyama A, Matsutani H, Sugimoto A, Toda S, Fujitani T. Endovascular and Percutaneous Embolotherapy for the Body and Extremity Arteriovenous Malformations. INTERVENTIONAL RADIOLOGY (HIGASHIMATSUYAMA-SHI (JAPAN) 2023; 8:36-48. [PMID: 37485480 PMCID: PMC10359173 DOI: 10.22575/interventionalradiology.2022-0008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 04/24/2022] [Indexed: 07/25/2023]
Abstract
Arteriovenous malformations (AVMs) consist of abnormal communications between the arteries and veins. They can involve any part of the body and extremity and grow in proportion to age and in response to hormonal influence or trauma. When symptoms progress from Schöbinger clinical stage II to III, transcatheter and/or direct puncture embolization are less-invasive and repeatable options for symptom palliation. The goal of embolization is to obliterate the AV shunt, and the choice of lesion access and embolic agents is based on the individual anatomy and flow. Embolization can be technically challenging due to complex vascular anatomy and morbidity risks. Therefore, a multidisciplinary management is essential for the diagnosis and therapeutic intervention of AVMs.
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Affiliation(s)
- Keigo Osuga
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Kazuhiro Yamamoto
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Hiroki Higashihara
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Japan
| | - Hiroshi Juri
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Kiyohito Yamamoto
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Akira Higashiyama
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Hiroki Matsutani
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Asami Sugimoto
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Sou Toda
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
| | - Tomohiro Fujitani
- Department of Diagnostic Radiology, Osaka Medical and Pharmaceutical University, Japan
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Saito N, Inoue M, Ishida K, Taguchi H, Haga M, Shimoda E, Morimoto K, Takahama J, Tanaka T. A Case of Refractory Esophageal Varices Caused by an Inferior Mesenteric Arteriovenous Malformation with All Portal System Occlusion Successfully Treated via Transarterial Embolization. INTERVENTIONAL RADIOLOGY (HIGASHIMATSUYAMA-SHI (JAPAN) 2023; 8:83-87. [PMID: 37485479 PMCID: PMC10359167 DOI: 10.22575/interventionalradiology.2022-0032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 12/22/2022] [Indexed: 07/25/2023]
Abstract
Inferior mesenteric arteriovenous fistulas/malformations are rare, reported in only 40 cases as of 2021. Their main manifestations include portal hypertension and ischemic bowel disease. We report the case of a 50-year-old man with refractory esophageal varices caused by this condition that was successfully treated with transarterial embolization. Computed tomography revealed an inferior mesenteric arteriovenous malformation and ascending blood flow into the esophageal varices through a remarkably dilated marginal vein. All portal systems were occluded, possibly because of the myointimal hyperplasia of the inferior mesenteric vein. The patient recovered without hemorrhagic events after transarterial embolization and endoscopic injection sclerotherapy. This is the first report of an inferior mesenteric arteriovenous malformation resulting in refractory esophageal varices with all-portal system occlusion successfully treated with transarterial embolization.
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Affiliation(s)
- Natsuhiko Saito
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Masayoshi Inoue
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Kentaro Ishida
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Hidehiko Taguchi
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Masayo Haga
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Emiko Shimoda
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Kengo Morimoto
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Junko Takahama
- Department of Radiology, Higashiosaka City Medical Center, Japan
| | - Toshihiro Tanaka
- Department of Diagnostic and Interventional Radiology, Nara Medical University, Japan
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Plute T, Agarwal P, Patel A, Mallela AN, Lunsford LD, Abou-Al-Shaar H. Idiopathic De Novo Arteriovenous Malformation: A Rare Acquired Intracranial Lesion. Asian J Neurosurg 2023; 18:400-403. [PMID: 37397049 PMCID: PMC10313434 DOI: 10.1055/s-0043-1769893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023] Open
Abstract
The de novo development of cerebral arteriovenous malformations (AVMs) in adults is an exceedingly rare event that has prompted the theory that a "second hit" is required to induce AVM formation. The authors document development of an occipital AVM in an adult a decade and a half after a brain magnetic resonance imaging (MRI) disclosed no abnormality. A 31-year-old male with a family history of AVMs and a 14-year history of migraines with visual auras and seizures presented to our service. Because of the onset of a first seizure and migraine headaches at age 17, the patient underwent high-resolution MRI that showed no intracranial lesion. After 14 years of progressively worsening symptoms, he underwent a repeat MRI that demonstrated a new de novo Spetzler-Martin grade 3 left occipital AVM. The patient received anticonvulsants and underwent Gamma Knife radiosurgery for his AVM. This case suggests that patients with seizures or persistent migraine headaches should have periodic repeat neuroimaging to exclude the development of a vascular cause despite an initial negative MRI.
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Affiliation(s)
- Tritan Plute
- University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | - Prateek Agarwal
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States
| | - Aneek Patel
- Department of Neurological Surgery, New York University Langone Health, New York, New York, United States
| | - Arka N. Mallela
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States
| | - L Dade Lunsford
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States
| | - Hussam Abou-Al-Shaar
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States
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Karlsson B, Yeo TT. In Reply: Risk for Hemorrhage the First 2 Years After Gamma Knife Surgery for Arteriovenus Malformations: An Update. Neurosurgery 2023; 92:e133-e134. [PMID: 37018421 DOI: 10.1227/neu.0000000000002443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 01/11/2023] [Indexed: 04/07/2023] Open
Affiliation(s)
- Bengt Karlsson
- Department of Surgery, Division of Neurosurgery, National University Hospital, Singapore , Singapore
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Park H, Kang HS, Cho WS. Delayed Appearance of Radiologically Occult Cerebral Arteriovenous Malformation : A Case Report and Literature Review. J Korean Neurosurg Soc 2023; 66:199-204. [PMID: 36071567 PMCID: PMC10009249 DOI: 10.3340/jkns.2022.0165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 09/06/2022] [Indexed: 11/27/2022] Open
Abstract
It is critical to identify the ruptured cerebral arteriovenous malformations (AVMs) for secondary prevention. However, there are rare cases unidentified on the radiological evaluation. We report on a patient with the delayed appearance of radiologically occult AVM as a probable cause of the previous intracerebral hemorrhage (ICH). An 18-year-old male patient presented with a right temporal ICH. The preoperative radiological examination did not reveal any causative lesions. Because of the intraoperative findings suggesting an AVM, however, only hematoma was evacuated. Disappointedly, there were no abnormal findings on postoperative and follow-up radiographic examinations. Eleven years later, the patient presented with an epileptic seizure, and an AVM was identified in the right temporal lobe where ICH had occurred before. The patient underwent partial glue embolization followed by total surgical resection of the AVM and anterior temporal lobe. Based on the literature review published in the era of magnetic resonance imaging, common clinical presentation of radiologically occult AVMs included headache and seizure. Most of them were confirmed by pathologic examination after surgery. In cases of the ICH of unknown etiology in young patients, long-term follow-up should be considered.
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Affiliation(s)
- Hangeul Park
- Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Hyun-Seung Kang
- Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Won-Sang Cho
- Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
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Lin CJ, Chen KK, Hu YS, Yang HC, Lin CF, Chang FC. Quantified flow and angioarchitecture show similar associations with hemorrhagic presentation of brain arteriovenous malformations. J Neuroradiol 2023; 50:79-85. [PMID: 35120975 DOI: 10.1016/j.neurad.2022.01.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 01/25/2022] [Accepted: 01/26/2022] [Indexed: 01/31/2023]
Abstract
INTRODUCTION The purpose of our study was to elucidate the impact of brain arteriovenous malformation (BAVM) flow and wall shear stress (WSS) on angioarchitecture and to evaluate their association with hemorrhagic presentations. MATERIALS AND METHODS Forty-one patients with BAVMs were evaluated by phase-contrast MR angiography. Volume flow rate and WSS were quantified. Angioarchitectural features such as location, angiogenesis, venous stenosis, venous ectasia, venous phlebitis, venous rerouting, exclusive deep vein and venous sac were evaluated by two neuroradiologists. The correlation between BAVM flow and size was evaluated with Spearman correlation coefficients. Differences of size, flow, and WSS between the hemorrhagic and non-hemorrhagic groups, the seizure and non-seizure groups, and between the different groups based on angioarchitecture were evaluated with Mann-Whitney U tests. Accuracy in predicting hemorrhage was evaluated with receiver operating characteristic curves. RESULT BAVM flow was highly correlated with volume (ρ = 0.77). Higher flow was more commonly associated with angiogenesis, venous ectasia, venous rerouting, and venous phlebitis. Flow and angioarchitecture showed similar efficacy in differentiating hemorrhagic from non-hemorrhagic BAVMs. WSS did not demonstrate differences across any clinical groups. CONCLUSION Flow quantification and angioarchitecture analysis of BAVMs showed similar efficacy as evaluated by associations with hemorrhagic presentation. High flow affects both arterial and venous angioarchitecture, reflecting the nature of low vascular resistance in BAVMs.
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Affiliation(s)
- Chung-Jung Lin
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.
| | - Ko-Kung Chen
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Yong-Sin Hu
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Radiology, Taipei Veterans General Hospital Taoyuan Branch, Taoyuan, Taiwan
| | - Huai-Che Yang
- Department of Radiology, Taipei Veterans General Hospital Taoyuan Branch, Taoyuan, Taiwan; Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chun-Fu Lin
- Department of Radiology, Taipei Veterans General Hospital Taoyuan Branch, Taoyuan, Taiwan; Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Feng-Chi Chang
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
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Gaztanaga W, Luther E, McCarthy D, Chamyan G, Wang S, Ragheb J. Giant, symptomatic mixed vascular malformation containing a cavernoma, developmental venous anomaly, and capillary telangiectasia in a 19-month-old infant. Childs Nerv Syst 2022; 38:1005-1009. [PMID: 34595586 DOI: 10.1007/s00381-021-05358-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 09/05/2021] [Indexed: 10/20/2022]
Abstract
Intracranial mixed vascular malformations (MVMs) are defined as any combination of a developmental venous anomaly (DVA), cerebral cavernous malformation (CCM), capillary telangiectasia (CTG), or arteriovenous malformation (AVM) within a single, contiguous lesion. However, most MVMs described in the literature contain only 2 pathologically discrete malformations; juxtaposition of 3 or more abnormalities in a single lesion remains exceedingly rare. We present the case of a 19-month-old female with new onset focal seizures and a 4-cm right basal ganglia lesion initially believed to be an embryonal neoplasm. She subsequently underwent gross total resection (GTR) of the lesion via a transsylvian-transinsular approach. Intraoperatively, the lesion appeared to be heterogenous and highly vascular, with areas of purplish-gray friable tissue. Pathology confirmed the lesion to be a MVM containing a CCM, CTG, and a DVA. This appears to be the first reported case of such a lesion confirmed on pathology in the literature.
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Affiliation(s)
- Wendy Gaztanaga
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, USA.
| | - Evan Luther
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, USA
| | - David McCarthy
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Gabriel Chamyan
- Department of Pathology, Nicklaus Children's Hospital, Miami, FL, USA
| | - Shelly Wang
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Neurosurgery, Nicklaus Children's Hospital, Miami, FL, USA
| | - John Ragheb
- Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Neurosurgery, Nicklaus Children's Hospital, Miami, FL, USA
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Paganelli SL, Alejandro SA, Chang Mulato JE, Vela Rojas EJ, de Souza Coelho D, Dória-Netto HL, Campos Filho JM, Chaddad-Neto F. Awake Microsurgical Resection for a Precentral Gyrus Arteriovenous Malformation-Three-Dimensional Video and Anatomic Landmarks. World Neurosurg 2022; 163:37. [PMID: 35405319 DOI: 10.1016/j.wneu.2022.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 04/01/2022] [Accepted: 04/02/2022] [Indexed: 12/01/2022]
Abstract
Arteriovenous malformations (AVMs) are complex, heterogeneous, and uncommon neurovascular disorders that frequently manifest in young adults. Parenchymal AVMs are thought to be congenital, but this has been recently questioned in the literature.1,2 AVMs can change over time and cause focal neurological signs or neurocognitive deficits.3 The clinical presentation of an AVM is variable and depends mainly on the occurrence of bleeding as well as its location, size, and ability to take flow from adjacent areas.4 AVMs can be treated by a single modality or a combination of different modalities. According to the Expert Consensus on the Management of Brain Arteriovenous Malformations, neurosurgery may be the best option for Spetzler-Martin grade 2 AVMs.5 However, the treatment of these lesions when located in eloquent areas, especially in the central lobe, is controversial. Awake craniotomy allows identification of eloquent gyrus and can potentially facilitate resection with functional preservation. An alternative is stereotactic radiosurgery, but a qualitative comparative analysis revealed higher obliteration rate with awake AVM excision compared with stereotactic radiosurgery.6 Awake craniotomy was the earliest surgical procedure known, and it has become fashionable again. It was used in the past for surgical management of intractable epilepsy, but its indications are increasing, and it is a widely recognized technique for resection of mass lesions involving the eloquent cortex and for deep brain stimulation.7 Its application for resection of vascular lesions, including AVMs, is still limited. In the Video, we present a case of a cerebral AVM of the precentral gyrus in which we achieved complete resection with awake microsurgical treatment without any neurological sequelae for the patient.
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Affiliation(s)
| | | | | | | | | | - Hugo Leonardo Dória-Netto
- Department of Neurosurgery, Universidade Federal de Sao Paulo, São Paulo, São Paulo, Brazil; Hospital Beneficência Portuguesa de São Paulo, São Paulo, São Paulo, Brazil
| | - José Maria Campos Filho
- Department of Neurosurgery, Universidade Federal de Sao Paulo, São Paulo, São Paulo, Brazil; Hospital Beneficência Portuguesa de São Paulo, São Paulo, São Paulo, Brazil
| | - Feres Chaddad-Neto
- Department of Neurosurgery, Universidade Federal de Sao Paulo, São Paulo, São Paulo, Brazil; Hospital Beneficência Portuguesa de São Paulo, São Paulo, São Paulo, Brazil.
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Tawfik HA, Dutton JJ. Orbital Vascular Anomalies: A Nomenclatorial, Etiological, and Nosologic Conundrum. Ophthalmic Plast Reconstr Surg 2022; 38:108-121. [PMID: 34238823 DOI: 10.1097/iop.0000000000002029] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE Vascular anomalies are a heterogeneous group of disorders that frequently present in the periorbital region. They encompass 2 broad entities: vascular tumors, which possess a proliferative endothelium, and vascular malformations, which are basically localized defects of vascular morphogenesis. The primary goal of this review was to address inaccurate or controversial terminology in the oculoplastic literature concerning orbital and periorbital vascular anomalies and to categorize these lesions in an abridged and simplified hierarchical list that adheres as much as possible to the most recent (2018) iteration for the classification of vascular lesions proposed by the International Society for the Study of Vascular Anomalies (ISSVA). The secondary goal of this review was to review and update information regarding the genetic underpinnings of vascular anomalies and the downstream signaling pathways that are subsequently affected as a result of these genetic errors. METHODS A literature review was conducted in PubMed, MEDLINE, PubMed Central, National Center for Biotechnology Information Bookshelf, and Embase for several related keywords including "vascular anomalies, vascular malformations, vascular tumors, and cavernous venous malformation," both with and without adding the keywords "eyelid," "orbital," and "periorbital." In addition, a detailed search was conducted for controversial or obsolete keywords like "cavernous hemangioma," "lymphangioma," and "varices," again in their systemic and orbital/periorbital context. RESULTS Crucial issues in the 2018 ISSVA classification regarding the proper categorization of orbital vascular anomalies, particularly venous lesions, were critically evaluated and revised, and a regional, simplified, and abridged modification of the ISSVA 2018 classification was proposed. CONCLUSIONS Interdisciplinary and intradisciplinary dialogue concerning orbital vascular anomalies is seriously compromised due to the lack of a unanimous agreement on terminology and the absence of a unified classification concept system. The authors recommend that oculoplastic surgeons adopt ISSVA terminology whenever technically possible and scientifically sound. However, they also propose modifying the ISSVA 2018 classification specifically to adapt to the peculiarities of vascular anomalies in the periorbital region. At present, the simplified classification proposed here is a preliminary first step towards managing patients with orbital vascular anomalies with greater diagnostic and therapeutic precision, until such time in the future when the entire genetic makeup of orbital vascular anomalies is more completely elucidated. Optimistically, this could pave the way for a more robust classification and the ultimate therapeutic cure.
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Affiliation(s)
- Hatem A Tawfik
- Department of Ophthalmology, Ain Shams University, Cairo, Egypt
| | - Jonathan J Dutton
- Department of Ophthalmology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, U.S.A
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Saberianpour S, Shahri JJ, Amoueian S. Palmer Aspect Finger Swellings Could Be Arteriovenous Malformation. Indian J Surg 2022. [DOI: 10.1007/s12262-022-03316-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Miyata H, Kuwashige H, Hori T, Kubota Y, Pieper T, Coras R, Blümcke I, Yoshida Y. Variable histopathology features of neuronal dyslamination in the cerebral neocortex adjacent to epilepsy-associated vascular malformations suggest complex pathogenesis of focal cortical dysplasia ILAE type IIIc. Brain Pathol 2022; 32:e13052. [PMID: 35001442 PMCID: PMC9425012 DOI: 10.1111/bpa.13052] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/23/2021] [Accepted: 12/29/2021] [Indexed: 01/14/2023] Open
Abstract
Focal cortical dysplasia type IIIc (FCD‐IIIc) is histopathologically defined by the International League Against Epilepsy's classification scheme as abnormal cortical organization adjacent to epilepsy‐associated vascular malformations (VM). However, the incidence of FCD‐IIIc, its pathogenesis, or association with the epileptogenic condition remains to be clarified. We reviewed a retrospective series of surgical brain specimens from 14 epilepsy patients with leptomeningeal angiomatosis of Sturge‐Weber syndrome (LMA‐SWS; n = 6), cerebral cavernous malformations (CCM; n = 7), and an arteriovenous malformation (AVM; n = 1) to assess the histopathological spectrum of FCD‐IIIc patterns in VM. FCD‐IIIc was observed in all cases of LMA‐SWS and was designated as cortical pseudolaminar sclerosis (CPLS). CPLS showed a common pattern of horizontally organized layer abnormalities, including neuronal cell loss and astrogliosis, either manifesting predominantly in cortical layer (L) 3 extending variably to deeper areas with or without further extension to L2 and/or L4. Another pattern was more localized, targeting mainly L4 with extension to L3 and/or L5. Abnormal cortical layering characterized by a fusion of L2 and L3 or L4–L6 was also noted in two LMA‐SWS cases and the AVM case. No horizontal or vertical lamination abnormalities were observed in the specimens adjacent to the CCM, despite the presence of vascular congestion and dilated parenchymal veins in all VM. These findings suggest that FCD‐IIIc depends on the type of the VM and developmental timing. We further conclude that FCD‐IIIc represents a secondary lesion acquired during pre‐ and/or perinatal development rather than following a pathomechanism independent of LMA‐SWS. Further studies will be necessary to address the selective vulnerability of the developing cerebral neocortex in LMA‐SWS, including genetic, encephaloclastic, hemodynamic, or metabolic events.
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Affiliation(s)
- Hajime Miyata
- Department of Neuropathology, Research Institute for Brain and Blood Vessels, Akita Cerebrospinal and Cardiovascular Center, Akita, Japan
| | - Haruka Kuwashige
- Department of Neuropathology, Research Institute for Brain and Blood Vessels, Akita Cerebrospinal and Cardiovascular Center, Akita, Japan.,Akita University School of Medicine, Akita, Japan
| | - Tomokatsu Hori
- Department of Neurosurgery, Medical Corporation Moriyamakai, Moriyama Neurological Center Hospital, Tokyo, Japan
| | - Yuichi Kubota
- Department of Neurosurgery, Adachi Medical Center, Tokyo Women's Medical University, Tokyo, Japan.,Epilepsy Center, TMG Asaka Medical Center, Saitama, Japan
| | - Tom Pieper
- Center for Pediatric Neurology, Neurorehabilitation, and Epileptology, Schoen-Clinic, Vogtareuth, Germany
| | - Roland Coras
- Department of Neuropathology, University Hospital Erlangen, Friedrich-Alexander University, Erlangen, Germany
| | - Ingmar Blümcke
- Department of Neuropathology, University Hospital Erlangen, Friedrich-Alexander University, Erlangen, Germany
| | - Yasuji Yoshida
- Department of Neuropathology, Research Institute for Brain and Blood Vessels, Akita Cerebrospinal and Cardiovascular Center, Akita, Japan
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Kumar JI, Wasserman J, Heller RS, Agazzi S. Spontaneous resolution of cerebral arteriovenous malformation after liver transplant: illustrative case. Br J Neurosurg 2021:1-4. [PMID: 34933609 DOI: 10.1080/02688697.2021.2016621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Revised: 09/25/2021] [Accepted: 12/05/2021] [Indexed: 01/02/2023]
Abstract
BACKGROUND Cerebral arteriovenous malformations (AVMs) have historically been considered congenital lesions with treatment options including surgery, radiation therapy, and observation. Spontaneous resolution of cerebral AVMs remains an exceedingly rare event with poorly understood pathophysiology. MATERIALS AND METHODS Herein we report a retrospective case review of a 28-year-old man with alcoholic cirrhosis who presented with a seizure 3 weeks after liver transplantation. Neuroimaging confirmed the presence of a Spetzler-Martin grade 2 AVM in the right frontal lobe. Due to the recent liver transplantation, treatment was deferred at the time of initial diagnosis and the patient was observed for a course of 1 year. Follow-up imaging 1 year later showed resolution of the AVM, confirmed by a catheter angiogram. CONCLUSION Spontaneous resolution of cerebral AVMs is a rare event. Treatment of chronic liver disease resulted in the normalization of angiogenic factors that likely led to AVM resolution. This case provides valuable insight into the vital role of angiogenesis in the natural history of AVMs.
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Affiliation(s)
- Jay I Kumar
- Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, FL, USA
| | - Jacob Wasserman
- Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, FL, USA
| | - Robert S Heller
- Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, FL, USA
- Department of Neurosurgery, Albany Medical Center, Albany, NY, USA
| | - Siviero Agazzi
- Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, FL, USA
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14
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Correia de Verdier M, Ronne-Engström E, Borota L, Nilsson K, Blomquist E, Wikström J. Magnetic resonance imaging detected radiation-induced changes in patients with proton radiation-treated arteriovenous malformations. Acta Radiol Open 2021; 10:20584601211050886. [PMID: 34888061 PMCID: PMC8649916 DOI: 10.1177/20584601211050886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 09/16/2021] [Indexed: 11/20/2022] Open
Abstract
Background Treatment of intracranial arteriovenous malformations (AVMs) includes surgery, radiation therapy, endovascular occlusion, or a combination. Proton radiation therapy enables very focused radiation, minimizing dose to the surrounding brain. Purpose To evaluate the presence of radiation-induced changes on post-treatment MRI in patients with AVMs treated with proton radiation and to compare these with development of symptoms and nidus obliteration. Material and Methods Retrospective review of pre- and post-treatment digital subtraction angiography and MRI and medical records in 30 patients with AVMs treated with proton radiation. Patients were treated with two or five fractions; total radiation dose was 20–35 physical Gy. Vasogenic edema (minimal, perinidal, or severe), contrast enhancement (minimal or annular), cavitation and nidus obliteration (total, partial, or none) were assessed. Results 26 of 30 patients (87%) developed MRI changes. Vasogenic edema was seen in 25 of 30 (83%), abnormal contrast enhancement in 18 of 26 (69%) and cavitation in 5 of 30 (17%). Time from treatment to appearance of MRI changes varied between 5 and 25 months (median 7, mean 10). Seven patients developed new or deteriorating symptoms that required treatment with corticosteroids; all these patients had extensive MRI changes (severe vasogenic edema and annular contrast enhancement). Not all patients with extensive MRI changes developed symptoms. We found no relation between MRI changes and nidus obliteration. Conclusion Radiation-induced MRI changes are seen in a majority of patients after proton radiation treatment of AVMs. Extensive MRI changes are associated with new or deteriorating symptoms.
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Affiliation(s)
| | | | - Ljubisa Borota
- Department of Surgical Sciences, Section of Neuroradiology, Uppsala University, Uppsala, Sweden
| | - Kristina Nilsson
- Department of Immunology, Genetics and Pathology, Section of Oncology, Uppsala University, Uppsala, Sweden
| | - Erik Blomquist
- Department of Immunology, Genetics and Pathology, Section of Oncology, Uppsala University, Uppsala, Sweden
| | - Johan Wikström
- Department of Surgical Sciences, Section of Neuroradiology, Uppsala University, Uppsala, Sweden
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15
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Park H, Koh EJ, Lee EJ, Cheon JE, Kim SK. An acquired cerebral arteriovenous malformation after brain abscess treatment: case report and a review of the literature. Childs Nerv Syst 2021; 37:2923-2926. [PMID: 33502542 DOI: 10.1007/s00381-021-05050-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 01/14/2021] [Indexed: 10/22/2022]
Abstract
A cerebral arteriovenous malformation (AVM) is a congenital and static disease. However, there are increasing reports of acquired AVMs. The pathophysiology of an acquired AVM has not been fully elucidated but the suggested pathophysiology is a combination of genetic abnormalities and inflammatory cytokines caused by previous brain insults. We report a patient who developed an acquired AVM after the treatment for a brain abscess. She underwent Gamma Knife surgery to treat the acquired AVM. It is necessary to understand the characteristics of acquired AVMs and to further research acquired AVMs.
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Affiliation(s)
- Hangeul Park
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University Hospital, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Eun Jung Koh
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University Hospital, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.,Division of Pediatric Neurosurgery, Seoul National University Children's Hospital, Seoul, Republic of Korea
| | - Eun Jung Lee
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University Hospital, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Jung-Eun Cheon
- Division of Pediatric Radiology, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, South Korea
| | - Seung-Ki Kim
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University Hospital, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea. .,Division of Pediatric Neurosurgery, Seoul National University Children's Hospital, Seoul, Republic of Korea.
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16
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Ohbuchi H, Chernov M, Hagiwara S, Kubota Y, Kasuya H. De novo formation of thalamic AVM in a 8-year-old child confirmed by the negative postnatal MRI: Case illustration. J Clin Neurosci 2021; 88:157-158. [PMID: 33992176 DOI: 10.1016/j.jocn.2021.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Accepted: 03/18/2021] [Indexed: 12/01/2022]
Affiliation(s)
- Hidenori Ohbuchi
- Department of Neurosurgery, Medical Center East, Tokyo Women's Medical University, Tokyo, Japan.
| | - Mikhail Chernov
- Department of Neurosurgery, Medical Center East, Tokyo Women's Medical University, Tokyo, Japan
| | - Shinji Hagiwara
- Department of Neurosurgery, Medical Center East, Tokyo Women's Medical University, Tokyo, Japan
| | - Yuichi Kubota
- Department of Neurosurgery, Medical Center East, Tokyo Women's Medical University, Tokyo, Japan
| | - Hidetoshi Kasuya
- Department of Neurosurgery, Medical Center East, Tokyo Women's Medical University, Tokyo, Japan
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Florian IA, Beni L, Moisoiu V, Timis TL, Florian IS, Balașa A, Berindan-Neagoe I. 'De Novo' Brain AVMs-Hypotheses for Development and a Systematic Review of Reported Cases. ACTA ACUST UNITED AC 2021; 57:medicina57030201. [PMID: 33652628 PMCID: PMC7996785 DOI: 10.3390/medicina57030201] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 02/15/2021] [Accepted: 02/22/2021] [Indexed: 12/11/2022]
Abstract
Background and Objectives: Brain arteriovenous malformations AVMs have been consistently regarded as congenital malformations of the cerebral vasculature. However, recent case reports describing "de novo AVMs" have sparked a growing debate on the nature of these lesions. Materials and Methods: We have performed a systematic review of the literature concerning de novo AVMs utilizing the PubMed and Google Academic databases. Termes used in the search were "AVM," "arteriovenous," "de novo," and "acquired," in all possible combinations. Results: 53 articles including a total of 58 patients harboring allegedly acquired AVMs were identified by researching the literature. Of these, 32 were male (55.17%), and 25 were female (43.10%). Mean age at de novo AVM diagnosis was 27.833 years (standard deviation (SD) of 21.215 years and a 95% confidence interval (CI) of 22.3 to 33.3). Most de novo AVMs were managed via microsurgical resection (20 out of 58, 34.48%), followed by radiosurgery and conservative treatment for 11 patients (18.97%) each, endovascular embolization combined with resection for five patients (8.62%), and embolization alone for three (5.17%), the remaining eight cases (13.79%) having an unspecified therapy. Conclusions: Increasing evidence suggests that some of the AVMs discovered develop some time after birth. We are still a long way from finally elucidating their true nature, though there is reason to believe that they can also appear after birth. Thus, we reason that the de novo AVMs are the result of a 'second hit' of a variable type, such as a previous intracranial hemorrhage or vascular pathology. The congenital or acquired characteristic of AVMs may have a tremendous impact on prognosis, risk of hemorrhage, and short and long-term management.
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Affiliation(s)
- Ioan Alexandru Florian
- Clinic of Neurosurgery, Cluj County Emergency Clinical Hospital, 400012 Cluj-Napoca, Romania; (L.B.); (V.M.); (I.S.F.)
- Department of Neurosurgery, Iuliu Hatieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
- Correspondence:
| | - Lehel Beni
- Clinic of Neurosurgery, Cluj County Emergency Clinical Hospital, 400012 Cluj-Napoca, Romania; (L.B.); (V.M.); (I.S.F.)
| | - Vlad Moisoiu
- Clinic of Neurosurgery, Cluj County Emergency Clinical Hospital, 400012 Cluj-Napoca, Romania; (L.B.); (V.M.); (I.S.F.)
| | - Teodora Larisa Timis
- Department of Physiology, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania;
| | - Ioan Stefan Florian
- Clinic of Neurosurgery, Cluj County Emergency Clinical Hospital, 400012 Cluj-Napoca, Romania; (L.B.); (V.M.); (I.S.F.)
- Department of Neurosurgery, Iuliu Hatieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Adrian Balașa
- Clinic of Neurosurgery, Tîrgu Mureș County Clinical Emergency Hospital, 540136 Tîrgu Mureș, Romania;
- Department of Neurosurgery, Tîrgu Mureș University of Medicine, Pharmacy, Science and Technology, 540139 Tîrgu Mureș, Romania
| | - Ioana Berindan-Neagoe
- Research Center for Functional Genomics, Biomedicine, and Translational Medicine, Institute of Doctoral Studies, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania;
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Abdalla RN, Shokuhfar T, Hurley MC, Ansari SA, Jahromi BS, Potts MB, Batjer HH, Shaibani A. Metachronous spinal pial arteriovenous fistulas: case report. J Neurosurg Spine 2020; 34:310-315. [PMID: 33157537 DOI: 10.3171/2020.6.spine20600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 06/17/2020] [Indexed: 11/06/2022]
Abstract
Spinal pial arteriovenous fistulas (spAVFs) are believed to be congenital lesions, and the development of a de novo spAVF has not been previously described. A 49-year-old female with a childhood history of vascular malformation-induced right lower-extremity hypertrophy presented in 2004 with progressive pain in her right posterior thigh and outer foot. Workup revealed 3 separate type IV spAVFs, which were treated by combined embolization and resection, with final conventional angiography showing no residual spinal vascular lesion in 2005. Ten years later, the patient returned with new right lower-extremity weakness, perineal pain, and left plantar foot numbness. Repeat spinal angiography demonstrated 2 de novo intertwined conus medullaris spAVFs.
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Affiliation(s)
- Ramez N Abdalla
- Departments of1Radiology
- 2Department of Radiology, Ain Shams University, Cairo, Egypt
| | - Tahaamin Shokuhfar
- Departments of1Radiology
- 3Department of Neurology, Loyola University, Chicago, Illinois; and
| | | | - Sameer A Ansari
- Departments of1Radiology
- 4Neurological Surgery, and
- 5Neurology, Northwestern University, Chicago, Illinois
| | | | | | - H Hunt Batjer
- 6Department of Neurological Surgery, University of Texas Southwestern, Dallas, Texas
| | - Ali Shaibani
- Departments of1Radiology
- 4Neurological Surgery, and
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Nagai Y, Anan M, Fujiki M. Cerebral Arteriovenous Malformations as Acquired Lesions: Case Reports and Review of the Literature. J Stroke Cerebrovasc Dis 2020; 29:105157. [PMID: 32912502 DOI: 10.1016/j.jstrokecerebrovasdis.2020.105157] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 07/12/2020] [Indexed: 12/18/2022] Open
Abstract
Cerebral arteriovenous malformations (AVMs) are generally attributed to congenital lesions that arise from aberrant vasculogenesis between the fourth and eighth weeks of embryonic life. However, this dogma has been challenged by several recent observations, one of which is de novo formation of AVMs. Forty cases of de novo AVMs were published between 2000 and 2019, all of which involved a history of intracranial insult, such as vascular abnormalities or nonvascular conditions, prior to AVM diagnosis. We hereby present two unique operative cases of ruptured de novo AVMs in older adult patients. Case 1 is novel in the sense that the patient did not experience any kind of environmental trigger ("second hit") such as a previous intracranial insult, while Case 2 serves as the second report of a de novo AVM patient with a medical history of Bell's palsy. Although the exact mechanisms of AVM formation remain to be elucidated, it is likely to be a multifactorial process related to environmental and hemodynamic factors.
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Affiliation(s)
- Yasuyuki Nagai
- Department of Neurosurgery, National Hospital Organization Beppu Medical Center, 1473 Uchikamado, Beppu, Oita 8740011, Japan.
| | - Mitsuhiro Anan
- Department of Neurosurgery, National Hospital Organization Beppu Medical Center, 1473 Uchikamado, Beppu, Oita 8740011, Japan
| | - Minoru Fujiki
- Department of Neurosurgery, Oita University Faculty of Medicine, 1-1 Idaigaoka Hasama-machi, Yufu, Oita 8795593, Japan
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20
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Ryu B, Sato S, Mochizuki T, Inoue T, Okada Y, Niimi Y. De novo intracranial arteriovenous malformation development after endovascular treatment for a pial arteriovenous fistula in capillary malformation-arteriovenous malformation syndrome. Interv Neuroradiol 2020; 27:25-30. [PMID: 32635776 DOI: 10.1177/1591019920940515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Capillary malformation-arteriovenous malformation (CM-AVM) syndrome is a newly described entity characterized by autosomal dominantly inherited multifocal capillary malformations caused by RASA1 mutations (CM-AVM1) or EPHB4 mutations (CM-AVM2). Concurrent high-flow vascular anomalies in the brain are often present in the form of intracranial AVM or arteriovenous fistula (AVF). These high-flow lesions are often identified at or soon after birth because of the characteristic unique capillary malformations or a systemic disorder due to a high-flow shunt, such as respiratory distress or heart failure. However, de novo intracranial AVMs have not been reported in patients with CM-AVM syndrome. Herein, we report the case of a six-year-old boy with CM-AVM1 who had been treated for an intracranial pial arteriovenous fistula approximately five years previously, in whom a de novo intracranial AVM was identified on a follow-up angiographic study. To the best of our knowledge, this report is the first to document a de novo intracranial AVM in a patient with CM-AVM. We recommend careful neuroimaging follow-up even if initial neuroimaging screening is negative because of the risk of de novo AVM development.
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Affiliation(s)
- Bikei Ryu
- Department of Neuroendovascular Therapy, St. Luke's International Hospital, Tokyo, Japan.,Department of Neurosurgery, St. Luke's International Hospital, Tokyo, Japan.,Department of Neurosurgery, Tokyo Women's Medical University, Tokyo, Japan
| | - Shinsuke Sato
- Department of Neuroendovascular Therapy, St. Luke's International Hospital, Tokyo, Japan.,Department of Neurosurgery, St. Luke's International Hospital, Tokyo, Japan.,Department of Neurosurgery, Tokyo Women's Medical University, Tokyo, Japan
| | - Tatsuki Mochizuki
- Department of Neurosurgery, St. Luke's International Hospital, Tokyo, Japan
| | - Tatsuya Inoue
- Department of Neurosurgery, St. Luke's International Hospital, Tokyo, Japan
| | - Yoshikazu Okada
- Department of Neurosurgery, St. Luke's International Hospital, Tokyo, Japan
| | - Yasunari Niimi
- Department of Neuroendovascular Therapy, St. Luke's International Hospital, Tokyo, Japan
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