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willis circle

Anita A Harteveld, Nerissa P Denswil, Wim Van Hecke, Hugo J Kuijf, Aryan Vink, Wim G M Spliet, Mat J Daemen, Peter R Luijten, Jaco J M Zwanenburg, Jeroen Hendrikse, Anja G van der Kolk
In this article, we report data on vessel wall thickness parameters derived from different arterial segments of the circle of Willis and its primary branches in patients with and without cerebrovascular disease. Also data on inter-rater reliability and agreement of the derived vessel wall parameters are reported. For further interpretation and discussion please refer to the research article "ex vivo vessel wall thickness measurements of the human circle of Willis using 7T MRI" (Harteveld et al., in press) [1]...
August 2018: Data in Brief
Constantin Roder, Eva Bürkle, Florian Heinrich Ebner, Marcos Tatagiba, Ulrike Ernemann, Alfred Buck, Philipp T Meyer, Nadia Khan
BACKGROUND: and Purpose: Moyamoya disease is a stenoocclusive disease of the circle of Willis with growth of pathological collaterals. We studied the indispensability of functional perfusion imaging (H2 15 O-PET with Acetazolamide (AZA) challenge) compared to conventional MRI and angiography for indication of cerebral revascularization of Moyamoya patients. METHODS: We performed a retrospective blinded analysis of individual imaging modalities (MRI, angiogram, PET) and scored each modality for the severity of disease in 21 untreated Moyamoya patients with 78 affected vascular territories...
June 7, 2018: World Neurosurgery
Masatsugu Hamaji, Takeshi Kubo, Kenji Minatoya, Hiroshi Date
A 74-year-old man presented with a left superior sulcus tumour invading the subclavian artery. After induction chemoradiotherapy, he underwent a vertebral artery reconstruction in addition to the subclavian artery reconstruction via a transmanubrial approach and video-assisted thoracoscopic left upper lobectomy. The final pathology was ypT4N0M0 adenocarcinoma. The technical aspects and indication for a vertebral artery reconstruction are discussed in this article.
June 1, 2018: European Journal of Cardio-thoracic Surgery
Ryota Sugisawa, Masaki Sano, Naoto Yamamoto, Kazunori Inuzuka, Hiroki Tanaka, Takaaki Saito, Kazuto Katahashi, Tatsuro Yata, Takafumi Kayama, Yuta Yamanaka, Hiroya Takeuchi, Naoki Unno
BACKGROUND: Innominate artery aneurysm (IAA) is a rare cervical artery aneurysm. Although atherosclerosis is its most common cause, IAAs due to cervical injury are often reported. Operative indications for IAAs include rupture or symptomatic aneurysm, saccular aneurysm, aneurysm with a diameter of 3 cm or greater, and aneurysmal change of the origin of the innominate artery. Although the ligature of the innominate artery or open surgical repair is well described, the usefulness of endovascular repair has also recently been reported...
January 1, 2018: Vascular and Endovascular Surgery
Yabo Huang, Peng Zhou, Zhong Wang, Qingdong Han
BACKGROUND: Internal carotid artery (ICA) occlusion associated with posterior cerebral artery (PCA) aneurysms can be regarded as rare cerebrovascular disease. The common treatment of aneurysms consisting of direct clipping or coiling are not taken into consideration as to this kind of cerebrovascular property. Combined surgical cerebrovascular reconstruction of superficial temporal artery to middle cerebral artery (STA-MCA) bypass is a chance of down-regulating the hemodynamic stress of rupture of aneurysms...
May 23, 2018: World Neurosurgery
K N Babichev, A V Savello, D V Svistov, D V Kandyba, E M Barashkov
The article presents a clinical case of segmental agenesis of the cervical ICA with collateral blood supply to the ICA territory through the intercavernous anastomosis and ascending pharyngeal artery with the branching primitive stapedial artery - the aberrant ICA variant. A feature of the case is a unique combination of the intercavernous anastomosis and the aberrant ICA, which provide collateral blood flow in cervical ICA agenesis. In the world literature, there are no reports of similar combinations. The discussion provides information on the stages of circle of Willis formation and presents a literature review of cases of intercavernous anastomoses associated with ICA agenesis...
2018: Zhurnal Voprosy Neĭrokhirurgii Imeni N. N. Burdenko
R S Dzhindzhikhadze, O N Dreval', V A Lazarev, A V Polyakov, R L Kambiev
The concept of minimally invasive neurosurgery has significantly evolved in recent years, which is associated with improvements in diagnostics, microneurosurgical techniques, anesthesiology, and intraoperative imaging. MATERIAL AND METHODS: We present the preliminary results of using transpalpebral craniotomy in surgery of supratentorial aneurysms and anterior cranial fossa tumors. In the period between 2015 and 2107, we used this approach in surgical treatment of 30 aneurysms (10 aneurysms in the 'cold' period of hemorrhage and 20 unruptured aneurysms) and 10 anterior cranial fossa base tumors...
2018: Zhurnal Voprosy Neĭrokhirurgii Imeni N. N. Burdenko
Rosie Kitson-Boyce, Nicholas Blagden, Belinda Winder, Gayle Dillon
Circles of support and accountability (CoSA) in the prison-model begin prior to the core members' release from prison and continue with them on release in to the community. The purpose of this study was to explore the expectations of release of those convicted of a sexual offense and how this develops during their participation in the prison sessions of CoSA. The research question was to consider how the prison-model of CoSA relates to the desistance of crime, in particular the phases of desistance developed by Gobbels, Ward, and Willis...
May 1, 2018: Sexual Abuse: a Journal of Research and Treatment
Akram Youssef, Tamer Ghazy, Stephan Kersting, Jennifer Lynne Leip, Ralf-Thorsten Hoffmann, Utz Kappert, Klaus Matschke, Norbert Weiss, Adrian Mahlmann
BACKGROUND: Numerous conditions that affect the boundary between the aortic arch and descending aorta are treated with thoracic endovascular aortic repair (TEVAR). In 40 % of cases, coverage of the left subclavian artery (LSA) cannot be prevented. Subsequently, neurological complications such as stroke or ischemia of the left upper extremity may develop. However, the actual risk of these complications is subject to considerable controversy. The optimal treatment approach, specifically the question whether primary revascularization of the LSA should be performed in all cases, is unclear...
May 23, 2018: VASA. Zeitschrift Für Gefässkrankheiten
Tarek Mohammed El-Gammal, Wafik Said Bahnasy, Osama Abd Allah Ragab, Ayman Mohammed Al-Malt
Background: Border zone infarcts (BZI) are ischemic lesions at the junction between two main arterial territories which may be either cortical or internal BZI. Methods: This study was conducted on 76 cerebral BZI patients and 20 healthy control subjects. Patients were divided to group I included 26 internal BZI, group II included 19 cortical BZI and group III included 21 mixed internal/cortical BZI patients. Included subjects were submitted to neurological examination, laboratory investigations, ECG, echocardiogram, brain CT and/or MRI and extra and intracranial blood vessels imaging by duplex and CT angiography...
2018: The Egyptian journal of neurology, psychiatry and neurosurgery
Anita Lwanga, Waldo Herrera, Katya Cruz Madrid, Antony Irungu
Moyamoya vasculopathy is a condition of chronic, progressive occlusion of the distal internal carotid arteries and the Circle of Willis. The resultant ischemia produces compensatory angiogenesis and the growth of a network of collateral blood vessels, which on angiography resemble a "puff of smoke" or "moyamoya" in Japanese. The objective of this case report is to describe the clinical course of a patient with Down and moyamoya syndromes and to enlighten clinicians about strategies that can be taken to enhance the care of similar patients...
March 16, 2018: Curēus
B-C Lee, Y-H Lin, C-W Lee, H-M Liu, A Huang
BACKGROUND AND PURPOSE: Permanent common carotid artery and/or ICA occlusion is an effective treatment for carotid blowout syndrome. Besides postoperative thromboembolic infarction, permanent common carotid artery and/or ICA occlusion may cause borderzone infarction when the collateral flow to the deprived brain territory is inadequate. In this study, we aimed to test the predictive value of CTA for post-permanent common carotid artery and/or ICA occlusion borderzone infarction in patients with carotid blowout syndrome...
May 17, 2018: AJNR. American Journal of Neuroradiology
Rémy Pascot, Benjamin Parat, Yann Le Teurnier, Gilles Godet, Jean-Yves Gauvrit, Yann Gouëffic, Eric Steinmetz, Alain Cardon, Adrien Kaladji
BACKGROUND: The optimization of medical treatment regularly challenges the role of carotid surgery for asymptomatic patients. Current research seeks to determine which of these patients will benefit most from surgery. The goal of this study was to identify in a multi-center study, using MRI, the risk factors for postoperative silent cerebral ischemic lesions after carotid surgery for asymptomatic stenosis METHODS: The multicenter, retrospective study included patients with asymptomatic severe carotid stenosis suitable for surgical treatment and who did not have a history of cerebral ischemia...
May 14, 2018: Annals of Vascular Surgery
Adekunle Adekile, Meaad Hassan, Akram Asbeutah, Mohamed Al-Hinai, Omar Trad, Nayef Farhan
OBJECTIVES: Transcranial Doppler ultrasound is used to identify patients with sickle cell disease (SCD) at risk for stroke. We performed transcranial Doppler studies in patients from 4 countries in the Arabian Peninsula (Kuwait, Oman, Iraq, and United Arab Emirates) to document the prevalence of abnormal transcranial Doppler findings. METHODS: The patients were recruited from outpatient clinics and studied in a steady state. Transcranial Doppler examinations were performed with standard equipment by experienced operators...
May 6, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Giovanni Malferrari, Giuseppe Pulito, Attilia Maria Pizzini, Nicola Carraro, Giorgio Meneghetti, Enzo Sanzaro, Patrizio Prati, Antonio Siniscalchi, Daniela Monaco
The purpose of this review is to provide an update on technology related to Transcranial Color Coded Doppler Examinations. Microvascularization (MicroV) is an emerging Power Doppler technology which can allow visualization of low and weak blood flows even at high depths, thus providing a suitable technique for transcranial ultrasound analysis. With MicroV, reconstruction of the vessel shape can be improved, without any overestimation. Furthermore, by analyzing the Doppler signal, MicroV allows a global image of the Circle of Willis...
May 4, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
Selim Bozkurt
Neurological complications in continuous flow left ventricular assist device (CF-LVAD) patients are the second-leading risk of death after multi-organ failure. They are associated with altered blood flow in the cardiovascular system because of CF-LVAD support. Moreover, an impaired cerebral autoregulation function may also contribute to complications such as hyperperfusion in the cerebral circulation under mechanical circulatory support. The aim of this study is to evaluate the effect of cerebral autoregulatory function on cerebral blood flow rate under CF-LVAD support...
May 3, 2018: Artificial Organs
Alexander Patronis, Robin A Richardson, Sebastian Schmieschek, Brian J N Wylie, Rupert W Nash, Peter V Coveney
Drug targeting promises to substantially enhance future therapies, for example through the focussing of chemotherapeutic drugs at the site of a tumor, thus reducing the exposure of healthy tissue to unwanted damage. Promising work on the steering of medication in the human body employs magnetic fields acting on nanoparticles made of paramagnetic materials. We develop a computational tool to aid in the optimization of the physical parameters of these particles and the magnetic configuration, estimating the fraction of particles reaching a given target site in a large patient-specific vascular system for different physiological states (heart rate, cardiac output, etc...
2018: Frontiers in Physiology
George P Huang, Hongtao Yu, Zifeng Yang, Ryan Schwieterman, Bryan Ludwig
One-dimensional (1D) simulation of the complete vascular network, so called THINkS (Total Human Intravascular Network Simulation) is developed to investigate changes of blood flow characteristics caused by the variation of CoW. THINkS contains 158 major veins, 85 major arteries, and 77 venous and 43 arterial junctions. THINkS is validated with available in vivo blood flow waveform data. The overall trends of flow rates in variations of the CoW, such as the missing anterior cerebral artery (missing-A1) or missing posterior cerebral artery (missing-P1), are confirmed by in vivo experimental data...
March 2018: Computer Methods in Biomechanics and Biomedical Engineering
Anita A Harteveld, Nerissa P Denswil, Wim Van Hecke, Hugo J Kuijf, Aryan Vink, Wim G M Spliet, Mat J Daemen, Peter R Luijten, Jaco J M Zwanenburg, Jeroen Hendrikse, Anja G van der Kolk
BACKGROUND AND AIMS: MRI can detect intracranial vessel wall thickening before any luminal stenosis is present. Apart from representing a vessel wall lesion, wall thickening could also reflect normal (age-related) variations in vessel wall thickness present throughout the intracranial arterial vasculature. The aim of this study was to perform vessel wall thickness measurements of the major intracranial arteries in ex vivo circle of Willis (CoW) specimens using 7T MRI, to obtain more detailed information about wall thickness variations of the intracranial arteries...
April 24, 2018: Atherosclerosis
Byoung Joo Park, Kang Min Kim, Woong Jae Lee, In Kook Chun, Inkyeong Kim, Seung Jin Lee, Seongheon Kim
BACKGROUND: Despite improvements in medical treatment, many patients experience ischemic stroke owing to internal carotid artery occlusion. We retrospectively evaluated a novel method based on the arterial structure of the circle of Willis (CoW) to identify patients at a high risk of recurrent stroke. METHODS: The study enrolled 104 patients with symptomatic occlusion of the internal carotid artery. CoW integrity was evaluated by a quantitative scoring system based on conventional angiography...
April 24, 2018: World Neurosurgery
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