Use the keywords feature with a free QxMD account.
Use Read by QxMD to access full text via your institution or open access sources.
Read also provides personalized recommendations to keep you up to date in your field.
Existing User
Sign InNew to Read
Sign Up#21
JOURNAL ARTICLE
Jason Diljohn, Fidel Rampersad, Paramanand Maharaj, Kristyn Parmesar
OBJECTIVES: This article seeks to determine the prevalence of a complete circle of Willis (CoW) and its common morphological variations in a south Trinidad population, while also investigating the influence of gender, age, and ethnicity on CoW morphology. METHODS: A prospective, descriptive, cross-sectional study was done on the magnetic resonance images for consecutive patients who had a brain MRI/magnetic resonance angiography at a tertiary health institution in south Trinidad between October 2019 and September 2020...
January 2024: BJR open
#22
JOURNAL ARTICLE
Alejandro Raúl Schmidt, Pablo Ignacio Felipe Inserra, Mariela Giacchino, Sergio Ferraris, Fernando Lange, Ramiro Vidal Figueredo, Julia Halperin, Alfredo Daniel Vitullo, Verónica Berta Dorfman
Oxygenated blood is required for the adequate metabolic activity of the brain. This is supplied by the circle of Willis (CoW) and the vertebrobasilar and carotid systems. The CoW ensures blood flow in case of arterial stenosis or occlusion. Different animal models have been explored for the CoW morphological and functional study. This work aims to characterize the vascular architecture of the CoW of the plains vizcacha, Lagostomus maximus (Suborder: Hystricomorpha), and to compare it with evolutionarily related species of Caviomorpha and Muroidea...
March 2024: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
#23
JOURNAL ARTICLE
Vanessa M Swiatek, Amir Amini, Celina E Sandalcioglu Ortuño, Lena Spitz, Karl Hartmann, Ali Rashidi, Klaus-Peter Stein, Sylvia Saalfeld, I Erol Sandalcioglu, Belal Neyazi
Intracranial aneurysms (IAs) located in the anterior and posterior circulations of the Circle of Willis present differential rupture risks. This study aimed to compare the rupture risk and clinical outcomes of anterior communicating artery aneurysms (AcomA) and basilar tip aneurysms (BAs); two IA types located along the midline within the Circle of Willis. We retrospectively collected data from 1026 patients presenting with saccular IAs. Only AcomA and BAs with a 3D angiography were included. Out of 186 included IAs, a cohort of 32 BAs was matched with AcomA based on the patients' pre-existing conditions and morphological parameters of IAs...
February 7, 2024: Neurosurgical Review
#24
JOURNAL ARTICLE
Yue Cui, Haibin Huang, Jialu Liu, Mingyang Zhao, Chengyi Li, Xinyong Han, Na Luo, Jinquan Gao, Dong-Ming Yan, Chen Zhang, Tianzi Jiang, Shan Yu
PURPOSE: Cerebrovascular segmentation and quantification of vascular morphological features in humans and rhesus monkeys are essential for prevention, diagnosis, and treatment of brain diseases. However, current automated whole-brain vessel segmentation methods are often not generalizable to independent datasets, limiting their usefulness in real-world environments with their heterogeneity in participants, scanners, and species. MATERIALS AND METHODS: In this study, we proposed an automated, accurate and generalizable segmentation method for magnetic resonance angiography images called FFCM-MRF...
January 17, 2024: Computers in Biology and Medicine
#25
JOURNAL ARTICLE
Zhensen Chen, Wenjin Liu, Niranjan Balu, Li Chen, Dakota Ortega, Xiaoqin Huang, Thomas S Hatsukami, Junwei Yang, Chun Yuan
BACKGROUND: Hypertension-induced impairment of the cerebral artery network contributes to cognitive impairment. Characterizing the structure and function of cerebral arteries may facilitate the understanding of hypertension-related pathological mechanisms and lead to the development of new indicators for cognitive impairment. PURPOSE: To investigate the associations between morphological features of the intracranial arteries distal to the circle of Willis on time-of-flight MRA (TOF-MRA) and cognitive performance in a hypertensive cohort...
January 23, 2024: Journal of Magnetic Resonance Imaging: JMRI
#26
REVIEW
Jana Korte, Ehlar Sophie Klopp, Philipp Berg
The Circle of Willis (CoW) describes the arterial system in the human brain enabling the neurovascular blood supply. Neurovascular diseases like intracranial aneurysms (IAs) can occur within the CoW and carry the risk of rupture, which can lead to subarachnoid hemorrhage. The assessment of hemodynamic information in these pathologies is crucial for their understanding regarding detection, diagnosis and treatment. Multi-dimensional in silico approaches exist to evaluate these hemodynamics based on patient-specific input data...
January 11, 2024: Bioengineering
#27
JOURNAL ARTICLE
Sarath C Pathuri, William C Johnson, Matthew R Webb, Tristan C Fielder, Fadi Al-Saiegh, Ryan P Morton, Pavel Rodriguez, Lee Birnbaum, Justin R Mascitelli
BACKGROUND: Acute tandem occlusions (TOs) are challenging to treat. Although acute carotid stenting of the proximal lesion is well tolerated, there are certain situations when the practitioner may be wary of acute stenting (bleeding concerns). OBJECTIVE: The purpose of this study was to retrospectively study patients with tandem occlusions who had re-occlusion of the extracranial ICA and develop a Circle of Willis Score (COWS) to help predict which patients could forego acute stenting...
January 2024: Clinical Neurology and Neurosurgery
#28
Kaiyuan Yang, Fabio Musio, Yihui Ma, Norman Juchler, Johannes C Paetzold, Rami Al-Maskari, Luciano Höher, Hongwei Bran Li, Ibrahim Ethem Hamamci, Anjany Sekuboyina, Suprosanna Shit, Houjing Huang, Diana Waldmannstetter, Florian Kofler, Fernando Navarro, Martin Menten, Ivan Ezhov, Daniel Rueckert, Iris Vos, Ynte Ruigrok, Birgitta Velthuis, Hugo Kuijf, Julien Hämmerli, Catherine Wurster, Philippe Bijlenga, Laura Westphal, Jeroen Bisschop, Elisa Colombo, Hakim Baazaoui, Andrew Makmur, James Hallinan, Bene Wiestler, Jan S Kirschke, Roland Wiest, Emmanuel Montagnon, Laurent Letourneau-Guillon, Adrian Galdran, Francesco Galati, Daniele Falcetta, Maria A Zuluaga, Chaolong Lin, Haoran Zhao, Zehan Zhang, Sinyoung Ra, Jongyun Hwang, Hyunjin Park, Junqiang Chen, Marek Wodzinski, Henning Müller, Pengcheng Shi, Wei Liu, Ting Ma, Cansu Yalçin, Rachika E Hamadache, Joaquim Salvi, Xavier Llado, Uma Maria Lal-Trehan Estrada, Valeriia Abramova, Luca Giancardo, Arnau Oliver, Jialu Liu, Haibin Huang, Yue Cui, Zehang Lin, Yusheng Liu, Shunzhi Zhu, Tatsat R Patel, Vincent M Tutino, Maysam Orouskhani, Huayu Wang, Mahmud Mossa-Basha, Chengcheng Zhu, Maximilian R Rokuss, Yannick Kirchhoff, Nico Disch, Julius Holzschuh, Fabian Isensee, Klaus Maier-Hein, Yuki Sato, Sven Hirsch, Susanne Wegener, Bjoern Menze
The Circle of Willis (CoW) is an important network of arteries connecting major circulations of the brain. Its vascular architecture is believed to affect the risk, severity, and clinical outcome of serious neuro-vascular diseases. However, characterizing the highly variable CoW anatomy is still a manual and time-consuming expert task. The CoW is usually imaged by two angiographic imaging modalities, magnetic resonance angiography (MRA) and computed tomography angiography (CTA), but there exist limited public datasets with annotations on CoW anatomy, especially for CTA...
December 29, 2023: ArXiv
#29
Konstantinos G Seretis, Theofanis Papas, Nikolaos Giannakopoulos, Afroditi Antoniou, Andreas M Lazaris
A complete configuration of the circle of Willis is not always present, and anatomical variations are observed often. The fetal posterior cerebral artery has been described in cases where the embryonic posterior communicating artery has failed to regress, something that may happen on the right side, the left side, or bilaterally. We describe a case of a male patient with bilateral posterior cerebral arteries with direct communication with the internal carotid artery on both sides who presented with symptoms of stroke allocated to both posterior and middle cerebral artery areas...
December 2023: Curēus
#30
MULTICENTER STUDY
Mitchell Braun, Ilona J Frieden, Dawn H Siegel, Elizabeth George, Christopher P Hess, Christine K Fox, Sarah L Chamlin, Beth A Drolet, Denise Metry, Elena Pope, Julie Powell, Kristen Holland, Caden Ulschmid, Marilyn G Liang, Kelly K Barry, Tina Ho, Chantal Cotter, Eulalia Baselga, David Bosquez, Surabhi Neerendranath Jain, Jordan K Bui, Irene Lara-Corrales, Tracy Funk, Alison Small, Wenelia Baghoomian, Albert C Yan, James R Treat, Griffin Stockton Hogrogian, Charles Huang, Anita Haggstrom, Mary List, Catherine C McCuaig, Victoria Barrio, Anthony J Mancini, Leslie P Lawley, Kerrie Grunnet-Satcher, Kimberly A Horii, Brandon Newell, Amy Nopper, Maria C Garzon, Margaret E Scollan, Erin F Mathes
OBJECTIVE: To characterize long-term outcomes of PHACE syndrome. STUDY DESIGN: Multicenter study with cross-sectional interviews and chart review of individuals with definite PHACE syndrome ≥10 years of age. Data from charts were collected across multiple PHACE-related topics. Data not available in charts were collected from patients directly. Likert scales were used to assess the impact of specific findings. Patient-Reported Outcomes Measurement Information System (PROMIS) scales were used to assess quality of life domains...
April 2024: Journal of Pediatrics
#31
JOURNAL ARTICLE
Anne E Moore, Laligam N Sekhar, Kirk W Beach
BACKGROUND: The measurement of blood velocity in the carotid artery has been the most popular noninvasive method of identifying and classifying carotid stenosis for half a century. Carotid stenosis is an indicator of elevated risk of stroke; anatomic revascularization reduces the chance of stroke by more than half. Controversy persists on how patients with severe carotid stenosis should be selected for anatomic revascularization. Patients with a connected circle of Willis (coW) might not benefit from anatomic revascularization; patients with two segments missing in the coW are most likely to benefit from revascularization...
December 20, 2023: Annals of Translational Medicine
#32
JOURNAL ARTICLE
Franziska Gaidzik, Jana Korte, Sylvia Saalfeld, Gábor Janiga, Philipp Berg
PURPOSE: Hemodynamics play an important role in the assessment of intracranial aneurysm (IA) development and rupture risk. The purpose of this study was to examine the impact of complex vasculatures onto the intra-vessel and intra-aneurysmal blood flow. METHODS: Complex segmentation of a subject-specific, 60-outlet and 3-inlet circle of Willis model captured with 7T magnetic resonance imaging was performed. This model was trimmed to a 10-outlet model version. Two patient-specific IAs were added onto both models yielding two pathological versions, and image-based blood flow simulations of the four resulting cases were carried out...
January 11, 2024: International Journal of Computer Assisted Radiology and Surgery
#33
JOURNAL ARTICLE
Chloé Bourquin, Jonathan Porée, Brice Rauby, Vincent Perrot, Nin Ghigo, Hatim Belgharbi, Samuel Bélanger, Gerardo Ramos-Palacios, Nelson Cortes, Hugo Ladret, Lamyae Ikan, Christian Casanova, Frederic Lesage, Jean Provost
A rise in blood flow velocity variations (i.e., pulsatility) in the brain, caused by the stiffening of upstream arteries, is associated with cognitive impairment and neurodegenerative diseases. The study of this phenomenon requires brain-wide pulsatility measurements, with large penetration depth and high spatiotemporal resolution. The development of Dynamic Ultrasound Localization Microscopy (DULM), based on ULM, has enabled pulsatility measurements in the rodent brain in 2D. However, 2D imaging accesses only one slice of the brain and measures only 2D-projected and hence biased velocities ...
January 5, 2024: Physics in Medicine and Biology
#34
JOURNAL ARTICLE
Laleh Zarrinkoob, Sanne Myrnäs, Anders Wåhlin, Anders Eklund, Jan Malm
BACKGROUND: Compromised cerebral blood flow can contribute to future ischemic events in patients with symptomatic carotid artery disease. However, there is limited knowledge of the effects on cerebral hemodynamics resulting from a reduced internal carotid artery (ICA) blood flow rate (BFR). PURPOSE: Investigate how reduced ICA-BFR, relates to BFR in the cerebral arteries. STUDY TYPE: Prospective. SUBJECTS: Thirty-eight patients, age 72 ± 6 years (11 female)...
January 2, 2024: Journal of Magnetic Resonance Imaging: JMRI
#35
JOURNAL ARTICLE
Rafael de Athayde Soares, Zêmia Maria Câmara Costa Ferreira, Matheus Vegas Viana Portela, Mariana Valentim, Marcelo Fernando Matielo, Edson Takamitsu Nakamura, Aline Futigami Yoshimi, Roberto Sacilotto
BACKGROUND: The main objective of this study is to evaluate and compare the outcomes regarding operative mortality rate, ipsilateral stroke, and overall survival rate among patients with internal carotid artery stenosis submitted to carotid endarterectomy (CEA) or stenting regarding the completeness of circle of Willis (CoW). METHODS: Prospective, consecutive cohort study of patients submitted to carotid interventions (CEA and carotid stenting: CAS) for internal carotid artery stenosis diagnosis evaluated according complete or incomplete CoW...
December 28, 2023: Annals of Vascular Surgery
#36
JOURNAL ARTICLE
Ana-Maria Davidoiu, Mihai Lazăr, Alexandra Diana Vrapciu, Petrinel Mugurel Rădoi, Corneliu Toader, Mugurel Constantin Rusu
Background and Objectives: The microanatomy of the superior cerebellar artery (SCA) is clinically significant. We, thus, aimed at patterning unilateral and bilateral possibilities of SCA origin. Materials and Methods: In total, 205 archived records of computed tomography and magnetic resonance angiograms were used. There were defined types of SCA origin from the basilar artery (BA): "0"-absent SCA, "1"-preterminal, "2"-collateral SCA, with SCA appearing as a terminal branch of BA, and "3"-SCA from the posterior cerebral artery (PCA) of the cerebral type...
December 13, 2023: Medicina
#37
REVIEW
Audrius Širvinskas, Givi Lengvenis, Giedrius Ledas, Valerija Mosenko, Saulius Lukoševičius
Background and Objectives : The published literature highlights the fact that the integrity of the Circle of Willis has a direct impact on stroke outcome, especially in cases of distal internal carotid T occlusion. The aim of this study was to review the available data on the Circle of Willis configuration and thrombus location impact on patient outcome in cases of ischemic stroke. Materials and Methods : A systematic search according to PRISMA guidelines was performed in PubMed, Cochrane, and EMBASE databases to identify studies investigating the influence of Circle of Willis variants on ischemic stroke outcomes published up to March 2023...
December 3, 2023: Medicina
#38
JOURNAL ARTICLE
Yangchun Hu, Xiaojian Wang, Chao Li, Liang Zhao, Jing Luo, Lei Ye, Baochun Cheng
BACKGROUND: Moyamoya disease (MMD) is a cerebrovascular disorder characterized by progressive unilateral or bilateral stenosis of the distal internal carotid artery. As hemodynamic features in MMD patients alter, the comorbidity of intracranial aneurysm (IA) is sometimes observed clinically. We aim to investigate clinical characteristics and therapeutic strategies for the comorbidity of Moyamoya disease with intracranial aneurysms (MMD-IA). METHODS: A total of 13 MMD-IA patients were recruited in this study and were manifested to be intracranial hemorrhage...
December 20, 2023: Chinese Neurosurgical Journal
#39
JOURNAL ARTICLE
Sam Yu-Chieh Ho, Tsair-Wei Chien, Willy Chou
BACKGROUND: The ChatGPT (Open AI, San Francisco, CA), denoted by the Chat Generative Pretrained Transformer, has been a hot topic for discussion over the past few months. A verification of whether the code for drawing circle packing charts (CPCs) with R can be generated by ChatGPT and used to identify characteristics of articles by anesthesiology authors is needed. This study aimed to provide insights into article characteristics in the field of anesthesiology and to highlight the potential of ChatGPT for data visualization techniques (e...
December 15, 2023: Medicine (Baltimore)
#40
Siyuan Cheng, Ivan Fan Xia, Renate Wanner, Javier Abello, Amber N Stratman, Stefania Nicoli
Brain arteries are wrapped by vascular smooth muscle cells (VSMCs). Fully differentiated VSMCs are important for brain artery homeostasis, and they are lost in several cerebrovascular diseases. How healthy VSMCs differentiate on different brain arteries during development is unclear. Such knowledge will help regenerate lost VSMCs in brain arteriopathy. To answer this question, we studied the developmental muscularization of the zebrafish circle of Willis (CW) arteries, the major arterial loop that supplies blood to the brain in all vertebrates...
December 2, 2023: bioRxiv
Make the most of Read.
Download the mobile app.
Download the mobile app.
Fetching more papers... 
