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willis circle

Rui Zhang, Lotte Bonde Bertelsen, Christian Flø, Yan Wang, Hans Stødkilde-Jørgensen
BACKGROUND AND PURPOSE: Due to well-developed Circle of Willis in pigs, it is technically challenging to make persistent focal ischemic stroke based on occlusion of cerebral arteries. Endothelin-1 could cause a focal lesion by forcing transient but strong vasoconstriction in the circumscribed injected area. Its use in porcine stroke model has drawn attention lately. However, all the porcine endothelin-1 induced models were euthanized soon after surgery. Whether the brain lesion is persistent, and whether they could cause neurological deficit are not known...
October 20, 2016: Neuroscience Letters
Makarand Kulkarni, Vinay Chauhan, Sudheer Shetty
Reversible cerebral vasoconstriction syndrome (RCVS) is a disease characterized by thunderclap headache with severe vasospasm of middle sized vessels of circle of Willis or the extracranial circulation which spontaneously revert back. We report a middle aged female with severe headache and vasospasm of the vertebral arteries and vessels of circle of Willis causing multiple cerebral infarcts. The vasospasm resolved within 3 months.
June 2016: Journal of the Association of Physicians of India
Hatasu Kobayashi, Miroslav Brozman, Kateřina Kyselová, Daša Viszlayová, Takaaki Morimoto, Martin Roubec, David Školoudík, Andrea Petrovičová, Dominik Juskanič, Jozef Strauss, Marián Halaj, Peter Kurray, Marián Hranai, Kouji H Harada, Sumiko Inoue, Yukako Yoshida, Toshiyuki Habu, Roman Herzig, Shohab Youssefian, Akio Koizumi
RNF213/Mysterin has been identified as a susceptibility gene for moyamoya disease, a cerebrovascular disease characterized by occlusive lesions in the circle of Willis. The p.R4810K (rs112735431) variant is a founder polymorphism that is strongly associated with moyamoya disease in East Asia. Many non-p.R4810K rare variants of RNF213 have been identified in white moyamoya disease patients, although the ethnic mutations have not been investigated in this population. In the present study, we screened for RNF213 variants in 19 Slovakian and Czech moyamoya disease patients...
2016: PloS One
Ronak Dholakia, Chandramouli Sadasivan, David Fiorella, Henry Woo, B Barry Lieber
Cerebral aneurysms are pathological focal evaginations of the arterial wall at and around the junctions of the circle of Willis. Their tenuous walls predispose aneurysms to leak or rupture leading to hemorrhagic strokes with high morbidity and mortality rates. The endovascular treatment of cerebral aneurysms currently includes the implantation of fine-mesh stents, called flow diverters, within the parent artery bearing the aneurysm. By mitigating flow velocities within the aneurysmal sac, the devices preferentially induce thrombus formation in the aneurysm within hours to days...
October 11, 2016: Journal of Biomechanical Engineering
Esther A Warnert, Jonathan C Rodrigues, Amy E Burchell, Sandra Neumann, Laura E Ratcliffe, Nathan E Manghat, Ashley D Harris, Zoe H Adams, Angus K Nightingale, Richard G Wise, Julian F Paton, Emma C Hart
RATIONALE: Data from animal models of hypertension indicate that high blood pressure may develop as a vital mechanism to maintain adequate blood flow to the brain. We propose that congenital vascular abnormalities of the posterior cerebral circulation and cerebral hypoperfusion could partially explain the etiology of essential hypertension, which remains enigmatic in 95% of patients. OBJECTIVE: To evaluate the role of the cerebral circulation in the pathophysiology of hypertension...
September 26, 2016: Circulation Research
Gaspar Alberto Motta-Ramírez
BACKGROUND: Trauma is the most common cause of death in young adults. A multidisciplinary trauma team consists of at least a surgical team, an anesthesiology team, radiologic team, and an emergency department team. OBJECTIVE: Recognize the integration of multidisciplinary medical team in managing the trauma patient and which must include the radiologist physician responsible for the institutional approach to the systematization of the trauma patient regarding any radiological and imaging study with emphasis on the FAST (del inglés, Focused Assessment with Sonography in Trauma)/USTA, Whole body computed tomography...
July 2016: Gaceta Médica de México
Metin Orakdöğen, Selin Tural Emon, Hakan Somay, Taner Engin, Merih Iş, Tayfun Hakan
AIM: Investigation of the vascular variations in patients with intracranial aneurysm in circle of Willis. MATERIAL AND METHODS: We used the data on 128 consecutive intracranial aneurysm cases. Cerebral angiography images were analyzed retrospectively. Arteries grouped as anterior cerebral arterial system (ACS), posterior cerebral arterial system (PCS) and middle cerebral arterial system (MCS) for grouping vascular variations. Lateralization, being single/multiple, gender; and also any connection with accompanying aneurysm's number, localization, dimension, being bleeding/incidental aneurysm has been inspected...
May 25, 2016: Turkish Neurosurgery
Grzegorz Turek, Andrzej Lewszuk, Jan Kochanowicz, Tomasz Lyson, Justyna Zielinska-Turek, Krzysztof Gorbacz, Zenon Mariak
BACKGROUND: We still lack reliable data on the outcomes of endovascular coiling for ruptured cerebral aneurysms. As this is still an evolving technique, the outcomes of the procedures performed in the past and more recently cannot be directly compared. We present the early outcomes of endovascular coiling in a relatively large group of patients with ruptured intracranial aneurysms. METHOD: The study included 190 consecutive patients (a total of 216 aneurysms) subjected to endovascular coiling in 2006-2013 (127 women aged 56±13 years and 63 men aged 50± 15 years)...
2016: Neurologia i Neurochirurgia Polska
Ji Man Hong, Yoon Hee Hong, Seong-Joon Lee, Sung Eun Lee, Jin Soo Lee, Dong Hoon Shin
To evaluate the hemodynamic contributions of collateral flow in adult patients with moyamoya disease, neurological deterioration or fluctuation during admission, Suzuki grade, various collateral routes, lesion volume, cerebral blood flow (CBF), and their associations were analyzed. Thirty patients (60 cerebral hemispheres, mean age 45 ± 25 years, and 73.3 % female) who were diagnosed with moyamoya disease or syndrome were enrolled over 3 years. Moyamoya stages from each hemisphere were stratified according to the Suzuki's criteria through six-vessel angiography into internal carotid arteries (ICAs), external carotid arteries (ECAs), and vertebral arteries (VAs)...
September 2, 2016: Neurological Sciences
Printha Wijesinghe, S K Shankar, T C Yasha, Catherine Gorrie, Dhammika Amaratunga, Sanjayah Hulathduwa, K Sunil Kumara, Kamani Samarasinghe, Yoo-Hun Suh, Harry W M Steinbusch, K Ranil D De Silva
BACKGROUND: Evidence from various consortia on vascular contributions has been inconsistent in determining the etiology of sporadic Alzheimer's disease (AD). OBJECTIVE: To investigate vascular risk factors and cerebrovascular pathologies associated in manifestation of AD-related neuropathological changes of an elderly population. METHODS: Postmortem brain samples from 76 elderly subjects (≥50 years) were used to study genetic polymorphisms, intracranial atherosclerosis of the circle of Willis (IASCW), and microscopic infarcts in deep white matters...
October 18, 2016: Journal of Alzheimer's Disease: JAD
N Wilson, D Pohl, J Michaud, A Doja, E Miller
AIM: To review the long-term clinical and imaging follow-up of eight children with histopathologically proven childhood primary central nervous system angiitis (cPACNS). MATERIALS AND METHODS: Eight children (5-17 years, five female and three male patients) with biopsy-proven cPACNS vasculitis were reviewed retrospectively. All children were followed at the Children's Hospital of Eastern Ontario. Magnetic resonance imaging (MRI) images of the brain parenchyma and vessel pattern of the arteries of the circle of Willis were reviewed at baseline and follow-up(s)...
November 2016: Clinical Radiology
Nikki Dieleman, Wenjie Yang, Anja G van der Kolk, Jill Abrigo, Ka Lok Lee, Winnie Chiu Wing Chu, Jaco J M Zwanenburg, Jeroen C W Siero, Ka Sing Wong, Jeroen Hendrikse, Fiona Xiang Yan Chen
BACKGROUND AND PURPOSE: Intracranial vessel wall imaging using MRI has great potential as a clinical method for assessing intracranial atherosclerosis. The purpose of the current study was to compare three 3T MRI vessel wall sequences with different contrast weightings (T1w, PD, T2w) and dedicated sagittal orientation perpendicular to the middle cerebral artery, to the reconstructed sagittal image from a transverse 3D T1w volumetric isotropically reconstructed turbo spin-echo acquisition (VIRTA), and provide a clinical recommendation...
2016: PloS One
André Rüffer, Philip Tischer, Frank Münch, Ariawan Purbojo, Okan Toka, Wolfgang Rascher, Robert Anton Cesnjevar, Jörg Jüngert
BACKGROUND: Cerebral protection during aortic arch repair can be provided by regional cerebral perfusion (RCP) through the innominate artery. This study addresses the question of an adequate bilateral blood flow in both hemispheres during RCP. METHODS: Fourteen infants (median age 11 days [range, 3 to 108]; median weight, 3.6 kg [range, 2.8 to 6.0 kg]) undergoing RCP (flow rate 54 to 60 mL · kg(-1) · min(-1)) were prospectively included. Using combined transfontanellar/transtemporal two- and three-dimensional power/color Doppler sonography, cerebral blood flow intensity in the main cerebral vessels was displayed...
August 12, 2016: Annals of Thoracic Surgery
Dario Paladini, Roee Birnbaum, Gloria Donarini, Ilaria Maffeo, Ezio Fulcheri
OBJECTIVES: Aims of this study are: 1) to perform an echo-anatomic correlation study, in order to confirm that the structure identified as the OC on ultrasound is indeed such anatomical structure; 2) to assess and compare the reproducibility of 2DUS and 3DUS in the measurement of the OC in normal foetuses; 3) to assess whether the spatial orientation of the chiasm changes with advancing gestational age. METHODS: Echo-anatomic study. The OC was studied in a neonatal specimen deceased at 29 + 4 weeks by passing a suture around the OC and visualising it during pulling of the suture itself...
August 12, 2016: Ultrasound in Obstetrics & Gynecology
R S Dzhindzhikhadze, O N Dreval', V A Lazarev, R L Kambiev
UNLABELLED: Progress in microneurosurgical techniques, neuroanesthesiology, and intraoperative imaging enables surgery using small incisions and craniotomy, in accordance with the keyhole surgery concept. Supraorbital craniotomy is the most widespread minimally invasive approach. There are a number of supraorbital craniotomy modifications, regarding different soft tissue incisions and the extent of craniotomy. We present the first results of using mini-orbitozygomatic craniotomy for aneurysms of the anterior circle of Willis and space-occupying lesions of the anterior and middle cranial fossae performed through an eyebrow incision...
2016: Zhurnal Voprosy Neĭrokhirurgii Imeni N. N. Burdenko
Andreas Polycarpou, László Hricisák, András Iring, Daniel Safar, Éva Ruisanchez, Béla Horváth, Péter Sándor, Zoltán Benyó
Cerebral circulation is secured by feed-forward and feed-back control pathways to maintain and eventually reestablish the optimal oxygen and nutrient supply of neurons in case of disturbances of the cardiovascular system. Using the high temporal and spatial resolution of laser-speckle imaging we aimed to analyze the pattern of cerebrocortical blood flow (CoBF) changes after unilateral (left) carotid artery occlusion (CAO) in anesthetized mice to evaluate the contribution of macrovascular (circle of Willis) vs...
October 1, 2016: American Journal of Physiology. Heart and Circulatory Physiology
Paulo Henrique Aguiar, Iracema Araújo ESTEVãO, César Cozar Pacheco, Marcos Vinicius Maldaun, Carlos Tadeu Oliveira
AIM: The aim of this retrospective study was to evaluate the follow-up results of patients who received surgical treatment for distal anterior cerebral artery aneurysms (pericallosal artery) and correlate these findings with the literature. MATERIAL AND METHODS: During the period of 2000 to 2013, 19 cases were operated, conducted preoperative angiographic and CT study. To classify the CT findings were used Fisher and World Federation of Neuro Surgeons (WFNS) SAH grading scales...
April 20, 2016: Turkish Neurosurgery
Nolan S Hartkamp, J Hendrikse, Laurens J L De Cocker, Gert Jan de Borst, L Jaap Kappelle, Reinoud P H Bokkers
PURPOSE: Cerebral perfusion territories are known to vary widely among individuals. This may lead to misinterpretation of the symptomatic artery in patients with ischaemic stroke to a wrong assumption of the underlying aetiology being thromboembolic or hypoperfusion. The aim of the present study was to investigate such potential misinterpretation with territorial arterial spin labelling (T-ASL) by correlating infarct location with imaging of the perfusion territory of the carotid arteries or basilar artery...
October 2016: Journal of Neurology, Neurosurgery, and Psychiatry
Sayied Abdol Mohieb Hosainey, Torstein R Meling
Unruptured intracranial aneurysms occur in 1-3 % of the general population, and the risk of rupture is generally considered to be low. However, patients with multiple aneurysms and familial predisposition carry a particular risk of subarachnoid hemorrhage (SAH). A 54-year-old hypertensive man underwent screening with a head CT angiography (CTA) because of his comorbidities. CTA revealed multiple bilateral aneurysms around the circle of Willis. At first surgery, seven aneurysms were clipped (BA, ACOM, ICA ×2, and MCA ×3), two of which were detected intraoperatively only...
October 2016: Neurosurgical Review
Joanna Wojczal, Tomasz Tomczyk, Piotr Luchowski, Grzegorz Kozera, Radosław Kaźmierski, Zbigniew Stelmasiak
The paper presents standards related to ultrasound imaging of the cerebral vasculature and structures. The aim of this paper is to standardize both the performance and description of ultrasound imaging of the extracranial and intracranial cerebral arteries as well as a study of a specific brain structure, i.e. substantia nigra hyperechogenicity. The following aspects are included in the description of standards for each ultrasonographic method: equipment requirements, patient preparation, study technique and documentation as well as the required elements of ultrasound description...
June 2016: Journal of Ultrasonography
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