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Cerebral artery anatomy

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https://www.readbyqxmd.com/read/28626075/sex-differences-in-vascular-physiology-and-pathophysiology-estrogen-and-androgen-signaling-in-health-and-disease
#1
Austin C Boese, Seong Chul Kim, Ke-Jie Yin, Jean-Pyo Lee, Milton H Hamblin
Sex differences between women and men are often overlooked and underappreciated when studying the cardiovascular system. It has been long assumed that men and women are physiologically similar, and this notion has resulted in females being clinically evaluated and treated for cardiovascular pathophysiological complications as males. Currently, there is increased recognition of fundamental sex differences in cardiovascular function, anatomy, cell signaling, and pathophysiology. NIH has enacted guidelines expressly to gain knowledge about ways the sexes differ in both normal function and diseases at the various research levels (molecular, cellular, tissue, organ, system)...
June 16, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28574040/-use-of-a-filtering-protective-device-during-angioplasty-and-stenting-of-the-brachiocephalic-trunk
#2
V N Tsygankov, A M Frantsevich
The authors carried out a pilot study aimed at assessing the possibility and efficacy of using filtering systems for protection of cerebral arteries from distal embolism during angioplasty and stenting of the brachiocephalic trunk. A total of five patients presenting with lesions of the brachiocephalic trunk underwent 5 roentgenoendovascular interventions with the use of the filtering protective device Spider FX. Angiographic and clinical success was achieved in 100% of cases. Particles of debris were obtained from the protective device in all cases...
2017: Angiologii︠a︡ i Sosudistai︠a︡ Khirurgii︠a︡, Angiology and Vascular Surgery
https://www.readbyqxmd.com/read/28565990/transcirculation-pipeline-embolization-device-deployment-a-rescue-technique
#3
Edison P Valle-Giler, Elias Atallah, Stavropoula Tjoumakaris, Robert H Rosenwasser, Pascal Jabbour
The Pipeline embolization device (PED) has become a very important tool in the treatment of nonruptured cerebral aneurysms. However, a patient's difficult anatomy or vascular stenosis may affect the device delivery. The purpose of this article was to describe an alternate technique for PED deployment when ipsilateral anatomy is not amenable for catheter navigation. A 44-year-old woman with a symptomatic 6-mm right superior hypophyseal artery aneurysm and a known history of right internal carotid artery dissection presented for PED treatment of her aneurysm...
June 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28556192/microsurgical-anatomy-of-the-maxillary-artery-for-extracranial-intracranial-bypass-in-the-pterygopalatine-segment-of-the-maxillary-artery
#4
O Akiyama, A Güngör, E H Middlebrooks, A Kondo, H Arai
The extracranial-intracranial (EC-IC) bypass using the maxillary artery (MA) has been successfully completed using a radial artery graft but the complicated anatomy and narrow exposure make it difficult. The purpose of this article is to define the microsurgical exposure of the MA through the middle fossa and describe the branches, diameter, and length of the MA available for the EC-IC bypass in the sphenopalatine fossa and anterior part of the infratemporal fossa. 5 cadaveric specimens were dissected bilaterally (10 MA dissections) to define the microsurgical anatomy of the MA through an intracranial approach...
May 27, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28552132/surgical-management-of-cerebral-dural-arteriovenous-fistulae
#5
Martin J Rutkowski, Brian Jian, Michael T Lawton
Dural arteriovenous fistulae are high flow, low resistance intracranial vascular malformations defined by an aberrant connection between an artery and dural vein or sinus. Symptomatology and presentation are highly dependent on location, generally categorized as supratentorial, tentorial, or infratentorial, and consist primarily of sequelae secondary to local venous hypertension, insufficiency, and cortical venous reflux. Surgery is generally reserved for high risk or persistently symptomatic lesions that are unamenable or unresponsive to endovascular therapy...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28541503/reduced-efficacy-of-the-pipeline-embolization-device-in-the-treatment-of-posterior-communicating-region-aneurysms-with-fetal-posterior-cerebral-artery-configuration
#6
Anil K Roy, Brian M Howard, Diogo C Haussen, Joshua W Osbun, Sameer H Halani, Susana L Skukalek, Frank Tong, Raul G Nogueira, Jacques E Dion, Charles M Cawley, Jonathan A Grossberg
BACKGROUND: Aneurysms at the origin of the posterior communicating artery (PcommA) have been demonstrated to be effectively treated with the pipeline embolization device (PED). Much less is known about the efficacy of the PED for aneurysms associated with a fetal posterior cerebral artery (fPCA) variant. OBJECTIVE: To study PED treatment efficacy of PcommA aneurysms, including fPCA aneurysms. METHODS: A prospectively maintained university database of aneurysm patients treated with the PED was retrospectively reviewed...
May 25, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28521360/exposure-of-the-external-carotid-artery-through-the-posterior-triangle-of-the-neck-a-novel-approach-to-facilitate-bypass-procedures-to-the-posterior-cerebral-circulation
#7
Ali Tayebi Meybodi, Michael T Lawton, Pooneh Mokhtari, Olivia Kola, Ivan H El-Sayed, Arnau Benet
BACKGROUND: The external carotid artery (ECA) is the main high-flow donor for extracranial-intracranial revascularization procedures. However, anatomic restraints limit the availability of ECA in posterior exposures of the craniocervical junction aimed for bypass to distal vertebral artery segments. OBJECTIVE: To examine the feasibility and safety of exposure of the ECA through the posterior triangle of the neck. METHODS: A preliminary feasibility study on the posterior neck exposure of the ECA was performed in 1 cadaveric head (2 sides) followed by a morphometric study on 9 cadaveric heads (18 sides)...
June 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28494642/normal-anatomy-and-variations-in-the-confluence-of-sinuses-using-digital-subtraction-angiography
#8
Yaqin Cheng, William A Li, Xingjuan Fan, Xiaohua Li, Jian Chen, Yan Wu, Ran Meng, Xunming Ji
OBJECTIVES: The configuration of the confluence of sinuses differs not only between individuals, but also between the two brain hemispheres, making the anatomical classification of this region difficult. In this study, we evaluated the anatomy of the confluence of sinuses and ascertained the accuracy and usefulness of digital subtraction angiography (DSA) in the evaluation of cerebral veins. METHODS: Bilateral carotid and vertebral artery angiographies were performed in 500 adult patients to evaluate the anatomy of the confluence of sinuses and contributory venous sinuses...
June 2017: Neurological Research
https://www.readbyqxmd.com/read/28439406/angiographic-anatomy-of-the-extracranial-and-intracranial-portions-of-the-internal-carotid-arteries-in-donkeys
#9
Nurul Hayah Khairuddin, Martin Sullivan, Patrick J Pollock
BACKGROUND: In horses, the extracranial and intracranial pathway of the internal carotid artery has been described. The extracranial pathway of the internal carotid artery begins at the carotid termination and runs on the dorsal surface of the medial compartment of the guttural pouch. Thereafter the internal carotid artery passes through the foramen lacerum to continue intracranially, forming part of the rostrolateral quadrants of the cerebral arterial circle (Circle of Willis). The objectives of this study were to define and record the anatomy of the carotid arterial tree and the internal carotid artery in donkeys using angiographic techniques...
2017: Irish Veterinary Journal
https://www.readbyqxmd.com/read/28400487/vascular-anatomy-predicts-the-risk-of-cerebral-ischemia-in-patients-randomized-to-carotid-stenting-versus-endarterectomy
#10
Mandy D Müller, Frank J Ahlhelm, Alexander von Hessling, David Doig, Paul J Nederkoorn, Sumaira Macdonald, Philippe A Lyrer, Aad van der Lugt, Jeroen Hendrikse, Christoph Stippich, H Bart van der Worp, Toby Richards, Martin M Brown, Stefan T Engelter, Leo H Bonati
BACKGROUND AND PURPOSE: Complex vascular anatomy might increase the risk of procedural stroke during carotid artery stenting (CAS). Randomized controlled trial evidence that vascular anatomy should inform the choice between CAS and carotid endarterectomy (CEA) has been lacking. METHODS: One-hundred eighty-four patients with symptomatic internal carotid artery stenosis who were randomly assigned to CAS or CEA in the ICSS (International Carotid Stenting Study) underwent magnetic resonance (n=126) or computed tomographic angiography (n=58) at baseline and brain magnetic resonance imaging before and after treatment...
April 11, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28379506/morphological-and-hemodynamic-differences-between-aneurysmal-middle-cerebral-artery-bifurcation-and-contralateral-nonaneurysmal-anatomy
#11
Jianping Song, Fengping Zhu, Yi Qian, Chubin Ou, Jiajun Cai, Xiang Zou, Zehan Wu, Wei Zhu, Liang Chen, Ying Mao
BACKGROUND: The morphological and hemodynamic features differ between middle cerebral artery (MCA) bifurcations with and without aneurysms. OBJECTIVE: To investigate the morphological and hemodynamic differences between aneurysmal MCA bifurcation and contralateral nonaneurysmal anatomy. METHODS: Computed tomography angiography of 36 patients with unilateral small saccular MCA bifurcation aneurysms was evaluated. The parent-daughter angles (φ1 for larger branch and φ2 for smaller branch), bifurcation angle (φ = φ1 + φ2), inclination angle (γ angle), and their relationships with the MCA bifurcation locations were analyzed...
March 30, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28347213/limb-misidentification-a-clinical-anatomical-prospective-study
#12
Daniel Antoniello, Reena Gottesman
The misidentification of one's own limb (LM) after right hemisphere stroke is a striking phenomenon that is incompletely understood. The authors prospectively studied the natural history and anatomy of LM in 36 patients with hyperacute right middle cerebral artery infarct. Unlike in previous studies, rapid clinical assessment was prioritized. The authors found LM to be common and transient, involving 61% at onset, evolving to 15% at 1 week. Voxel-based lesion-symptom mapping found supramarginal gyrus (SMG) damage associated with LM...
March 28, 2017: Journal of Neuropsychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28338438/learning-brain-aneurysm-microsurgical-skills-in-a-human-placenta-model-predictive-validity
#13
Marcelo Magaldi Ribeiro de Oliveira, Carlos Eduardo Ferrarez, Taise Mosso Ramos, Jose Augusto Malheiros, Arthur Nicolato, Carla Jorge Machado, Mauro Tostes Ferreira, Fellype Borges de Oliveira, Cecília Félix Penido Mendes de Sousa, Pollyana Helena Vieira Costa, Sebastiao Gusmao, Giuseppe Lanzino, Rolando Del Maestro
OBJECTIVE Surgery for brain aneurysms is technically demanding. In recent years, the process to learn the technical skills necessary for these challenging procedures has been affected by a decrease in the number of surgical cases available and progressive restrictions on resident training hours. To overcome these limitations, surgical simulators such as cadaver heads and human placenta models have been developed. However, the effectiveness of these models in improving technical skills is unknown. This study assessed concurrent and predictive validity of brain aneurysm surgery simulation in a human placenta model compared with a "live" human brain cadaveric model...
March 24, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28291675/choices-of-stent-and-cerebral-protection-in-the-ongoing-acst-2-trial-a-descriptive-study
#14
D D de Waard, A Halliday, G J de Borst, R Bulbulia, A Huibers, R Casana, L H Bonati, V Tolva
OBJECTIVE/BACKGROUND: Several plaque and lesion characteristics have been associated with an increased risk for procedural stroke during or shortly after carotid artery stenting (CAS). While technical advancements in stent design and cerebral protection devices (CPD) may help reduce the procedural stroke risk, and anatomy remains important, tailoring stenting procedures according to plaque and lesion characteristics might be a useful strategy in reducing stroke associated with CAS. In this descriptive report of the ongoing Asymptomatic Carotid Surgery Trial-2 (ACST-2), it was assessed whether choice for stent and use or type of CPD was influenced by plaque and lesion characteristics...
May 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28217397/a5-segment-aneurysm-of-the-anterior-cerebral-artery-imbedded-into-the-body-of-the-corpus-callosum-a-case-report
#15
Fransua Sharafeddin, Ahmad Hafez, Martin Lehecka, Rahul Raj, Roberto Colasanti, Ahmadreza Rafiei, Joham Choque, Behnam R Jahromi, Mika Niemelä, Juha Hernesniemi
BACKGROUND: The A5 segment aneurysms of the anterior cerebral artery are rare, approximately 0.5% of all intracranial aneurysms. They are small with a wide base located in the midline, with the domes mostly projecting upward or backward. CASE DESCRIPTION: The authors describe a unique case of A5 segment aneurysm, with the dome embedded into the body of the corpus callosum. This 41-year-old female was admitted to the neurology department for possible multiple sclerosis investigation...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28209740/quantitative-mri-volumetry-diffusivity-cerebrovascular-flow-and-cranial-hydrodynamics-during-head-down-tilt-and-hypercapnia-the-spacecot-study
#16
Larry Allen Kramer, Khader M Hasan, Ashot E Sargsyan, Karina Marshall-Goebel, Jörn Rittweger, Dorit Donoviel, Saki Higashi, Benson Mwangi, Darius A Gerlach, Eric M Bershad
PURPOSE: In order to improve the pathophysiologic understanding of visual changes observed in astronauts, we aimed to use quantitative MRI to measure anatomic and physiologic responses during a ground-based spaceflight analogue (head down tilt, HDT) combined with increased ambient carbon dioxide (CO2). METHODS: Six healthy, male subjects participated in the double-blinded, randomized cross-over design study with two conditions: 26.5 h of -12° HDT with ambient air and with 0...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28198523/diversity-among-posterior-thalamoperforating-branches-originated-from-p1-segment-systematic-review
#17
Cezary Grochowski, Ryszard Maciejewski
BACKGROUND: The P1 segment of the posterior cerebral artery (PCA) begins at the termination of the basilar artery and ends at the origin of posterior communicating artery (PCoM), within the interpeduncular cistern. Perforating branches arising from this segment are called posterior thalamoperforating arteries and the main and biggest artery among those is called thalamoperforating artery (TPA). Perforating branches are a crucial component of cerebrovascular system supplying the posterior part of the thalamus, subthalamus, hypothalamus, substantia nigra, perforated substance, posterior part of internal capsule and the nucleus of III and IV cranial nerve...
February 15, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/28191601/the-maxillary-artery-and-its-variants-an-anatomical-study-with-neurosurgical-applications
#18
Jorge E Alvernia, Joaquin Hidalgo, Marc P Sindou, Chad Washington, Gustavo Luzardo, Eddie Perkins, Remi Nader, Patrick Mertens
BACKGROUND: The maxillary artery (MA) has gained attention in neurosurgery particularly in cerebral revascularization techniques, intracranial endonasal approaches and endovascular procedures. OBJECTIVES: To describe and illustrate the anatomy of the MA and its neurosurgical importance in a detailed manner. METHODS: Six cadaveric heads (12 MAs) were injected with latex. The arteries and surrounding structures were dissected and studied using microsurgical techniques...
February 13, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28183839/mr-imaging-of-individual-perfusion-reorganization-using-superselective-pseudocontinuous-arterial-spin-labeling-in-patients-with-complex-extracranial-steno-occlusive-disease
#19
V Richter, M Helle, M J P van Osch, T Lindner, A S Gersing, P Tsantilas, H-H Eckstein, C Preibisch, C Zimmer
BACKGROUND AND PURPOSE: Patients with multiple stenoses or occlusions of the extracranial arteries require an individualized diagnostic approach. We evaluated the feasibility and clinical utility of a novel MR imaging technique for regional perfusion imaging in this patient group. MATERIALS AND METHODS: Superselective pseudocontinuous arterial spin-labeling with a circular labeling spot enabling selective vessel labeling was added to routine imaging in a prospective pilot study in 50 patients (10 women, 70...
February 9, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28135902/mapping-common-aphasia-assessments-to-underlying-cognitive-processes-and-their-neural-substrates
#20
Elizabeth H Lacey, Laura M Skipper-Kallal, Shihui Xing, Mackenzie E Fama, Peter E Turkeltaub
BACKGROUND: Understanding the relationships between clinical tests, the processes they measure, and the brain networks underlying them, is critical in order for clinicians to move beyond aphasia syndrome classification toward specification of individual language process impairments. OBJECTIVE: To understand the cognitive, language, and neuroanatomical factors underlying scores of commonly used aphasia tests. METHODS: Twenty-five behavioral tests were administered to a group of 38 chronic left hemisphere stroke survivors and a high-resolution magnetic resonance image was obtained...
May 2017: Neurorehabilitation and Neural Repair
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