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Danute Kalibatiene - One of the best experts on this subject based on the ideXlab platform.
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association between the Posterior Part of the circle of willis and the vertebral artery hypoplasia
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p<0.001. Moreover FCW was recorded in 50% of the subjects with VA-PICA in comparison with 13.5% of those with normal VA and 22.8% with VAH-BA, p<0.005. On the contrary, absence/hypoplasia of both PCoA was mostly found in the group with normal VA in comparison with VAH-BA and VAH-PICA (accordingly, 50.7%, 38.6% and 12.5%, p<0.01). CONCLUSION: Individuals with VAH have a different pattern of the Posterior Part of CW in comparison with those with normal VA. With the increasing degree of VAH, the proportion of FCW increases, while the proportion of absence/hypoplastic of both PCoA decreases.
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Association between the Posterior Part of the circle of Willis and the vertebral artery hypoplasia.
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p
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Association Between The Posterior Part Of The Circle Of Willis And Vertebral Artery Hypoplasia
bioRxiv, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:Background. It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in subjects free from stroke and TIA. Materials and methods. The present study was based on a sample of 923 subjects free from stroke and TIA who were examined from 2013 through 2018. All the Participants underwent MRA examination. The duplex ultrasonographic examination of the extracranial arteries (vertebral and carotid) was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. We classified the Posterior communicating arteries (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal CW (FCW). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery and terminating in PICA, neck or aplasia (VAH-PICA)). Results. FCW was found in 15.9% of subjects, bilaterally – in 2.3 %. The coexisting VAH was more common in subjects with FCW rather than in those with adult CW (respectively, 28.6% and 13.4%, p
Virginija Gaigalaite - One of the best experts on this subject based on the ideXlab platform.
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association between the Posterior Part of the circle of willis and the vertebral artery hypoplasia
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p<0.001. Moreover FCW was recorded in 50% of the subjects with VA-PICA in comparison with 13.5% of those with normal VA and 22.8% with VAH-BA, p<0.005. On the contrary, absence/hypoplasia of both PCoA was mostly found in the group with normal VA in comparison with VAH-BA and VAH-PICA (accordingly, 50.7%, 38.6% and 12.5%, p<0.01). CONCLUSION: Individuals with VAH have a different pattern of the Posterior Part of CW in comparison with those with normal VA. With the increasing degree of VAH, the proportion of FCW increases, while the proportion of absence/hypoplastic of both PCoA decreases.
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Association between the Posterior Part of the circle of Willis and the vertebral artery hypoplasia.
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p
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Association Between The Posterior Part Of The Circle Of Willis And Vertebral Artery Hypoplasia
bioRxiv, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:Background. It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in subjects free from stroke and TIA. Materials and methods. The present study was based on a sample of 923 subjects free from stroke and TIA who were examined from 2013 through 2018. All the Participants underwent MRA examination. The duplex ultrasonographic examination of the extracranial arteries (vertebral and carotid) was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. We classified the Posterior communicating arteries (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal CW (FCW). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery and terminating in PICA, neck or aplasia (VAH-PICA)). Results. FCW was found in 15.9% of subjects, bilaterally – in 2.3 %. The coexisting VAH was more common in subjects with FCW rather than in those with adult CW (respectively, 28.6% and 13.4%, p
Zbyněk Rocek - One of the best experts on this subject based on the ideXlab platform.
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development of the pelvis and Posterior Part of the vertebral column in the anura
Journal of Anatomy, 2005Co-Authors: Hana Rockova, Zbyněk RocekAbstract:The anuran pelvic girdle is unique among all amphibians in that its acetabular portion is located far Posterior to the sacrum, lateral to the postsacral (= caudal) vertebral column, which is reduced to a single rod-like element called the urostyle. This situation in the adult is strikingly different not only from that in ancestral temnospondyls but also in other modern amphibians. Because there is no fossil that would document this evolutionary anatomical modification except for Triadobatrachus, the only data may be inferred from development in modern anurans. We chose seven anuran species (belonging to the genera Discoglossus, Bombina, Pelobates, Bufo, Rana and Xenopus), representing the principal locomotory types (saltation, swimming, crawling and burrowing). Development of the pelvic girdle was studied on cleared and stained whole mounts and Partly on serial histological sections. The basic developmental pattern was similar in all species: the pelvis on both sides develops from two centres (puboischiadic and iliac, respectively). The ilium then extends vertically towards the sacral vertebra and later rotates Posteriorly so that ultimately the acetabulum is lateral to the tail (= urostyle). Only minor deviations from this pattern were found, mainly associated with differences in water and terrestrial dwelling.
Jurate Dementaviciene - One of the best experts on this subject based on the ideXlab platform.
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association between the Posterior Part of the circle of willis and the vertebral artery hypoplasia
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p<0.001. Moreover FCW was recorded in 50% of the subjects with VA-PICA in comparison with 13.5% of those with normal VA and 22.8% with VAH-BA, p<0.005. On the contrary, absence/hypoplasia of both PCoA was mostly found in the group with normal VA in comparison with VAH-BA and VAH-PICA (accordingly, 50.7%, 38.6% and 12.5%, p<0.01). CONCLUSION: Individuals with VAH have a different pattern of the Posterior Part of CW in comparison with those with normal VA. With the increasing degree of VAH, the proportion of FCW increases, while the proportion of absence/hypoplastic of both PCoA decreases.
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Association between the Posterior Part of the circle of Willis and the vertebral artery hypoplasia.
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p
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Association Between The Posterior Part Of The Circle Of Willis And Vertebral Artery Hypoplasia
bioRxiv, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:Background. It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in subjects free from stroke and TIA. Materials and methods. The present study was based on a sample of 923 subjects free from stroke and TIA who were examined from 2013 through 2018. All the Participants underwent MRA examination. The duplex ultrasonographic examination of the extracranial arteries (vertebral and carotid) was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. We classified the Posterior communicating arteries (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal CW (FCW). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery and terminating in PICA, neck or aplasia (VAH-PICA)). Results. FCW was found in 15.9% of subjects, bilaterally – in 2.3 %. The coexisting VAH was more common in subjects with FCW rather than in those with adult CW (respectively, 28.6% and 13.4%, p
Augenijus Vilimas - One of the best experts on this subject based on the ideXlab platform.
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association between the Posterior Part of the circle of willis and the vertebral artery hypoplasia
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p<0.001. Moreover FCW was recorded in 50% of the subjects with VA-PICA in comparison with 13.5% of those with normal VA and 22.8% with VAH-BA, p<0.005. On the contrary, absence/hypoplasia of both PCoA was mostly found in the group with normal VA in comparison with VAH-BA and VAH-PICA (accordingly, 50.7%, 38.6% and 12.5%, p<0.01). CONCLUSION: Individuals with VAH have a different pattern of the Posterior Part of CW in comparison with those with normal VA. With the increasing degree of VAH, the proportion of FCW increases, while the proportion of absence/hypoplastic of both PCoA decreases.
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Association between the Posterior Part of the circle of Willis and the vertebral artery hypoplasia.
PLOS ONE, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:BACKGROUND: It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in healthy volunteers. MATERIALS AND METHODS: The present study was based on a sample of 923 healthy volunteers who were examined from 2013 through 2018. The duplex ultrasonographic examination of the extracranial vertebral (VA) and carotid arteries was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. All the Participants underwent magnetic resonance angiography (MRA) examination. All the component vessels of the circle of Willis were assessed in each individual. We classified the Posterior communicating artery (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal-type Posterior circle of Willis (FCW) in which the major stem of the Posterior cerebral artery (PCA) arises from ipsilateral internal carotid artery (ICA). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery (VAH-PICA)). RESULTS: FCW was found in 15.9% of subjects, bilaterally-in 2.3%. FCW was more frequent in individuals with VAH than in those with normal VA (accordingly, 28.8% vs. 13.5%, p
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Association Between The Posterior Part Of The Circle Of Willis And Vertebral Artery Hypoplasia
bioRxiv, 2019Co-Authors: Virginija Gaigalaite, Jurate Dementaviciene, Augenijus Vilimas, Danute KalibatieneAbstract:Background. It is not clear whether the configuration of the Posterior Part of the circle of Willis (CW) depends on the proximal Part of the vertebrobasilar system. Our aim is to evaluate the Posterior Part of CW in association with different size of vertebral arteries (VA) in subjects free from stroke and TIA. Materials and methods. The present study was based on a sample of 923 subjects free from stroke and TIA who were examined from 2013 through 2018. All the Participants underwent MRA examination. The duplex ultrasonographic examination of the extracranial arteries (vertebral and carotid) was performed. VA was defined as hypoplastic (VAH) when VA diameter in the entire course was less than 2.5 mm. We classified the Posterior communicating arteries (PCoA) as presence PCoA, absence/hypoplastic PCoA and fetal CW (FCW). The comparison of the Posterior Part of CW was made in subjects with normal VA and VAH of a different degree (communicating with basilar artery (VAH-BA) and not communicating with the basilar artery and terminating in PICA, neck or aplasia (VAH-PICA)). Results. FCW was found in 15.9% of subjects, bilaterally – in 2.3 %. The coexisting VAH was more common in subjects with FCW rather than in those with adult CW (respectively, 28.6% and 13.4%, p
