The Experts below are selected from a list of 474 Experts worldwide ranked by ideXlab platform
Kazunari Yoshida - One of the best experts on this subject based on the ideXlab platform.
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intraosseous venous structures adjacent to the jugular tubercle associated with an anterior condylar dural arteriovenous fistula
Neuroradiology, 2018Co-Authors: Katsuhiro Mizutani, Takenori Akiyama, Yasuhiro Minami, Masahiro Toda, Hirokazu Fujiwara, Masahiro Jinzaki, Kazunari YoshidaAbstract:Purpose Although involvement of the osseous component with an anterior condylar dural arteriovenous fistula (AC-DAVF) has been frequently described, osseous venous structures in which AC-DAVFs develop have not been fully elucidated. We investigated osseous venous structures adjacent to the Hypoglossal Canal in normal controls and patients with AC-DAVFs.
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intraosseous venous structures adjacent to the jugular tubercle associated with an anterior condylar dural arteriovenous fistula
Neuroradiology, 2018Co-Authors: Katsuhiro Mizutani, Takenori Akiyama, Yasuhiro Minami, Masahiro Toda, Hirokazu Fujiwara, Masahiro Jinzaki, Kazunari YoshidaAbstract:Although involvement of the osseous component with an anterior condylar dural arteriovenous fistula (AC-DAVF) has been frequently described, osseous venous structures in which AC-DAVFs develop have not been fully elucidated. We investigated osseous venous structures adjacent to the Hypoglossal Canal in normal controls and patients with AC-DAVFs. The study included 50 individuals with unruptured aneurysms as normal controls and seven patients with AC-DAVFs. Osseous venous structures adjacent to the Hypoglossal Canal in normal controls were analyzed using computed tomography (CT) digital subtraction venography. In patients with AC-DAVFs, the fistulous pouches, draining veins, and surrounding venous structures were examined using cone beam CT. In 46.0% of laterals in normal controls, osseous venous structures were visualized within the jugular tubercle superomedially to the Hypoglossal Canal. We named these structures the jugular tubercle venous complex (JTVC). The JTVC was always continuous with the anterior condylar vein and was sometimes connected to surrounding venous channels. We detected nine fistulous pouches in the seven patients with AC-DAVFs. The fistulous pouches were in the JTVC (33.3%), anterior condylar vein (33.3%), and other venous channels within the exoccipital region (33.3%). Although the JTVC is a venous structure frequently found in normal people, it had not been investigated until now. The venous channel between the anterior condylar vein and JTVC is a common origin site for AC-DAVFs, and it was associated with 66.6% of the AC-DAVF cases in the current study.
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Hypoglossal neurinoma two case reports
Neurologia Medico-chirurgica, 2000Co-Authors: Michio Hoshi, Kazunari Yoshida, Kaoru Ogawa, Takeshi KawaseAbstract:Two patients presented with Hypoglossal neurinoma extending both intra- and extracranially. A 63-year-old male presented with right trigeminal neuralgia and Hypoglossal nerve paresis. The intracranial part of the tumor was removed totally via a suboccipital craniectomy. Over-coagulation of the venous collaterals, particularly the emissary veins, resulted in dural venous sinus thrombosis and cerebellar infarction. Unfortunately this patient died. A 48-year-old male presented with pareses of the VII, IX, X, XI, and XII cranial nerves and cerebellar sign. The tumor extended both extra- and intracranially, and was completely removed by opening the Hypoglossal Canal and the jugular foramen without over-coagulation of the venous collaterals. Preservation of the venous collaterals is very important for the prevention of postoperative venous complications.
William T Obrien - One of the best experts on this subject based on the ideXlab platform.
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republished the transclival artery a variant persistent carotid basilar arterial anastomosis not previously reported
Journal of NeuroInterventional Surgery, 2017Co-Authors: Jared D Kirkland, Brian C Dahlin, William T ObrienAbstract:During embryological development, primitive anastomoses exist between the carotid and vertebrobasilar arteries. These anastomoses typically regress or are incorporated into the developing vasculature. Persistence beyond fetal development, however, results in vascular anomalies that alter haemodynamic flow with a predisposition for aneurysm formation. The carotid–vertebrobasilar anastomoses mirror the primitive communications and include (from most to least common) the trigeminal, Hypoglossal, proatlantal and otic arteries. The Hypoglossal and proatlantal variants extend through the Hypoglossal Canal or foramen magnum, respectively. We present a previously undescribed variant of these persistent fetal anastomoses, the ‘transclival artery’, which courses through its own transclival skull base Canal/foramen.
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the transclival artery a variant persistent carotid basilar arterial anastomosis not previously reported
Case Reports, 2016Co-Authors: Jared D Kirkland, Brian C Dahlin, William T ObrienAbstract:During embryological development, primitive anastomoses exist between the carotid and vertebrobasilar arteries. These anastomoses typically regress or are incorporated into the developing vasculature. Persistence beyond fetal development, however, results in vascular anomalies that alter haemodynamic flow with a predisposition for aneurysm formation. The carotid–vertebrobasilar anastomoses mirror the primitive communications and include (from most to least common) the trigeminal, Hypoglossal, proatlantal and otic arteries. The Hypoglossal and proatlantal variants extend through the Hypoglossal Canal or foramen magnum, respectively. We present a previously undescribed variant of these persistent fetal anastomoses, the ‘transclival artery’, which courses through its own transclival skull base Canal/foramen.
Katsuhiro Mizutani - One of the best experts on this subject based on the ideXlab platform.
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intraosseous venous structures adjacent to the jugular tubercle associated with an anterior condylar dural arteriovenous fistula
Neuroradiology, 2018Co-Authors: Katsuhiro Mizutani, Takenori Akiyama, Yasuhiro Minami, Masahiro Toda, Hirokazu Fujiwara, Masahiro Jinzaki, Kazunari YoshidaAbstract:Purpose Although involvement of the osseous component with an anterior condylar dural arteriovenous fistula (AC-DAVF) has been frequently described, osseous venous structures in which AC-DAVFs develop have not been fully elucidated. We investigated osseous venous structures adjacent to the Hypoglossal Canal in normal controls and patients with AC-DAVFs.
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intraosseous venous structures adjacent to the jugular tubercle associated with an anterior condylar dural arteriovenous fistula
Neuroradiology, 2018Co-Authors: Katsuhiro Mizutani, Takenori Akiyama, Yasuhiro Minami, Masahiro Toda, Hirokazu Fujiwara, Masahiro Jinzaki, Kazunari YoshidaAbstract:Although involvement of the osseous component with an anterior condylar dural arteriovenous fistula (AC-DAVF) has been frequently described, osseous venous structures in which AC-DAVFs develop have not been fully elucidated. We investigated osseous venous structures adjacent to the Hypoglossal Canal in normal controls and patients with AC-DAVFs. The study included 50 individuals with unruptured aneurysms as normal controls and seven patients with AC-DAVFs. Osseous venous structures adjacent to the Hypoglossal Canal in normal controls were analyzed using computed tomography (CT) digital subtraction venography. In patients with AC-DAVFs, the fistulous pouches, draining veins, and surrounding venous structures were examined using cone beam CT. In 46.0% of laterals in normal controls, osseous venous structures were visualized within the jugular tubercle superomedially to the Hypoglossal Canal. We named these structures the jugular tubercle venous complex (JTVC). The JTVC was always continuous with the anterior condylar vein and was sometimes connected to surrounding venous channels. We detected nine fistulous pouches in the seven patients with AC-DAVFs. The fistulous pouches were in the JTVC (33.3%), anterior condylar vein (33.3%), and other venous channels within the exoccipital region (33.3%). Although the JTVC is a venous structure frequently found in normal people, it had not been investigated until now. The venous channel between the anterior condylar vein and JTVC is a common origin site for AC-DAVFs, and it was associated with 66.6% of the AC-DAVF cases in the current study.
Johnny B Delashaw - One of the best experts on this subject based on the ideXlab platform.
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dural arteriovenous fistula of the anterior condylar confluence and Hypoglossal Canal mimicking a jugular foramen tumor case report
Journal of Neurosurgery, 2008Co-Authors: Sean O Mcmenomey, James K Liu, Kelly B Mahaney, Stanley L Barnwell, Johnny B DelashawAbstract:The anterior condylar confluence (ACC) is located on the external orifice of the Canal of the Hypoglossal nerve and provides multiple connections with the dural venous sinuses of the posterior fossa, internal jugular vein, and the vertebral venous plexus. Dural arteriovenous fistulas (DAVFs) of the ACC and Hypoglossal Canal (anterior condylar vein) are extremely rare. The authors present a case involving an ACC DAVF and Hypoglossal Canal that mimicked a hypervascular jugular bulb tumor. This 53-year-old man presented with right Hypoglossal nerve palsy. A right pulsatile tinnitus had resolved several months previously. Magnetic resonance imaging demonstrated an enhancing right-sided jugular foramen lesion involving the Hypoglossal Canal. Cerebral angiography revealed a hypervascular lesion at the jugular bulb, with early venous drainage into the extracranial vertebral venous plexus. This was thought to represent either a glomus jugulare tumor or a DAVF. The patient underwent preoperative transarterial embolization followed by surgical exploration via a far-lateral transcondylar approach. At surgery, a DAVF was identified draining into the ACC and Hypoglossal Canal. The fistula was surgically obliterated, and this was confirmed on postoperative angiography. The patient's Hypoglossal nerve palsy resolved. Dural arteriovenous fistulas of the ACC and Hypoglossal Canal are rare lesions that can present with isolated Hypoglossal nerve palsies. They should be included in the differential diagnosis of hypervascular jugular bulb lesions. The authors review the anatomy of the ACC and discuss the literature on DAVFs involving the Hypoglossal Canal.
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quantitative description of the far lateral transcondylar transtubercular approach to the foramen magnum and clivus
Journal of Neurosurgery, 2000Co-Authors: Sergey Spektor, Gregory J Anderson, Sean O Mcmenomey, Michael A Horgan, Jordi X Kellogg, Johnny B DelashawAbstract:Object. The purpose of this study was to evaluate the far-lateral transcondylar transtubercular approach (complete FLA) based on quantitative measurements of the exposure of the foramen magnum and petroclival area obtained after each successive step of this approach. Methods. The complete FLA was reproduced in eight specially prepared cadaveric heads (a total of 15 sides). The approach was divided into six steps: 1) C-1 hemilaminectomy and suboccipital craniectomy with unroofing of the sigmoid sinus (basic FLA); 2) partial resection of the occipital condyle (up to the Hypoglossal Canal); 3) removal of the jugular tuberculum; 4) mastoidectomy (limited to the labyrinth and the fallopian Canal) and retraction of the sigmoid sinus; 5) resection of the lateral mass of C-1 with mobilization of the vertebral artery; and 6) resection of the remaining portion of the occipital condyle. After each successive step, a standard set of measurements was obtained using a frameless stereotactic device. The measurements wer...
James K Liu - One of the best experts on this subject based on the ideXlab platform.
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dural arteriovenous fistula of the anterior condylar confluence and Hypoglossal Canal mimicking a jugular foramen tumor case report
Journal of Neurosurgery, 2008Co-Authors: Sean O Mcmenomey, James K Liu, Kelly B Mahaney, Stanley L Barnwell, Johnny B DelashawAbstract:The anterior condylar confluence (ACC) is located on the external orifice of the Canal of the Hypoglossal nerve and provides multiple connections with the dural venous sinuses of the posterior fossa, internal jugular vein, and the vertebral venous plexus. Dural arteriovenous fistulas (DAVFs) of the ACC and Hypoglossal Canal (anterior condylar vein) are extremely rare. The authors present a case involving an ACC DAVF and Hypoglossal Canal that mimicked a hypervascular jugular bulb tumor. This 53-year-old man presented with right Hypoglossal nerve palsy. A right pulsatile tinnitus had resolved several months previously. Magnetic resonance imaging demonstrated an enhancing right-sided jugular foramen lesion involving the Hypoglossal Canal. Cerebral angiography revealed a hypervascular lesion at the jugular bulb, with early venous drainage into the extracranial vertebral venous plexus. This was thought to represent either a glomus jugulare tumor or a DAVF. The patient underwent preoperative transarterial embolization followed by surgical exploration via a far-lateral transcondylar approach. At surgery, a DAVF was identified draining into the ACC and Hypoglossal Canal. The fistula was surgically obliterated, and this was confirmed on postoperative angiography. The patient's Hypoglossal nerve palsy resolved. Dural arteriovenous fistulas of the ACC and Hypoglossal Canal are rare lesions that can present with isolated Hypoglossal nerve palsies. They should be included in the differential diagnosis of hypervascular jugular bulb lesions. The authors review the anatomy of the ACC and discuss the literature on DAVFs involving the Hypoglossal Canal.