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  1. Book ; Online ; E-Book: Atlas of the supraaortic craniocervical arterial variations

    Uchino, Akira

    MR and CT angiography

    2022  

    Author's details Akira Uchino
    Keywords Electronic books
    Language English
    Size 1 online resource (xx, 162 pages), Illustrationen, Diagramme
    Publisher Springer
    Publishing place Singapore
    Publishing country Singapore
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    HBZ-ID HT021197650
    ISBN 978-981-16-6803-6 ; 9789811668029 ; 981-16-6803-5 ; 9811668027
    DOI 10.1007/978-981-16-6803-6
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Article ; Online: Large persistent trigeminal artery variant that supplied the subtotal cerebellar hemisphere and caused trigeminal neuralgia, which was diagnosed by magnetic resonance (MR) angiography and MR cisternography.

    Uchino, Akira

    Surgical and radiologic anatomy : SRA

    2023  Volume 45, Issue 4, Page(s) 363–366

    Abstract: Purpose: To describe a case of large persistent trigeminal artery (PTA) variant that caused trigeminal neuralgia, which was diagnosed by magnetic resonance (MR) angiography and MR cisternography.: Case report: An 82-year-old woman with left ... ...

    Abstract Purpose: To describe a case of large persistent trigeminal artery (PTA) variant that caused trigeminal neuralgia, which was diagnosed by magnetic resonance (MR) angiography and MR cisternography.
    Case report: An 82-year-old woman with left trigeminal neuralgia underwent cranial MR imaging, MR angiography and MR cisternography. MR imaging revealed no significant abnormality. MR angiography showed that a relatively large artery arose from the precavernous segment of the left internal carotid artery (ICA) without connection to the basilar artery, which is indicative of a PTA variant. This artery supplied the left cerebellar arteries, except for the rostral branch of the superior cerebellar artery. MR cisternography showed that the inferior surface of the left trigeminal nerve was compressed by the PTA variant. She was treated by microvascular decompression surgery and her symptoms disappeared.
    Discussion: According to a meta-analysis, the prevalence of the PTA variants is reported to be 0.2%. The majority of PTA variants are small arteries and are classified as the anterior inferior cerebellar artery type. The present case involved a relatively large artery that supplied large territories of the cerebellar hemisphere. PTA and PTA variants rarely cause trigeminal neuralgia.
    Conclusion: Using MR angiography and MR cisternography, the author diagnosed a case of large PTA variant that caused trigeminal neuralgia. No similar case has been reported in the relevant English language literature.
    MeSH term(s) Aged, 80 and over ; Female ; Humans ; Cerebral Arteries/diagnostic imaging ; Magnetic Resonance Angiography ; Magnetic Resonance Imaging ; Magnetic Resonance Spectroscopy/adverse effects ; Trigeminal Neuralgia/diagnostic imaging ; Trigeminal Neuralgia/surgery
    Language English
    Publishing date 2023-02-09
    Publishing country Germany
    Document type Case Reports ; Journal Article
    ZDB-ID 632839-8
    ISSN 1279-8517 ; 0930-312X ; 0930-1038
    ISSN (online) 1279-8517
    ISSN 0930-312X ; 0930-1038
    DOI 10.1007/s00276-023-03098-8
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  3. Article: Supraclinoid internal carotid artery fenestration from which the posterior communicating artery arising with infundibular dilatation at its origin diagnosed by magnetic resonance angiography.

    Uchino, Akira

    Radiology case reports

    2022  Volume 17, Issue 7, Page(s) 2579–2582

    Abstract: A 72-year-old man with vertigo underwent cranial magnetic resonance (MR) imaging and MR angiography using a 3.0-Tesla scanner. MR angiography showed an aneurysm-like lateral protrusion from the left supraclinoid internal carotid artery (ICA) and ... ...

    Abstract A 72-year-old man with vertigo underwent cranial magnetic resonance (MR) imaging and MR angiography using a 3.0-Tesla scanner. MR angiography showed an aneurysm-like lateral protrusion from the left supraclinoid internal carotid artery (ICA) and infundibular dilatation of the left posterior communicating artery at its origin. After creating both partial maximum-intensity-projection images and partial volume-rendering images, a fenestration of the supraclinoid ICA was found. The posterior communicating artery arose from the fenestrated segment, and its origin was dilated triangularly, indicating infundibular dilatation. Cerebral arterial fenestration is not so rare, but it is rarely found at the ICA. The majority of recently reported cases had an associated aneurysm at the proximal end of the fenestration diagnosed using three-dimensional rotational angiography (3DRA). MR angiography is noninvasive and widely used for the screening of cerebral arterial lesions. Even though 3.0-Tesla scanner, special resolution of MR angiography is much lower than that of the 3DRA. For the diagnosis and confirmation of this rare variation, partial maximum-intensity-projection images and/or partial volume-rendering images are useful.
    Language English
    Publishing date 2022-05-20
    Publishing country Netherlands
    Document type Case Reports
    ZDB-ID 2406300-9
    ISSN 1930-0433
    ISSN 1930-0433
    DOI 10.1016/j.radcr.2022.04.033
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  4. Article ; Online: Duplicated superior cerebellar arteries, one of which was supplied by a persistent trigeminal artery variant diagnosed by magnetic resonance angiography.

    Uchino, Akira

    Surgical and radiologic anatomy : SRA

    2022  Volume 45, Issue 1, Page(s) 39–42

    Abstract: Purpose: The purpose of the study was to describe a case of duplicated superior cerebellar arteries (SCAs), whose caudal branch was supplied by a persistent trigeminal artery (PTA) variant, diagnosed by magnetic resonance (MR) angiography.: Case ... ...

    Abstract Purpose: The purpose of the study was to describe a case of duplicated superior cerebellar arteries (SCAs), whose caudal branch was supplied by a persistent trigeminal artery (PTA) variant, diagnosed by magnetic resonance (MR) angiography.
    Case report: A 74-year-old woman with a history of cerebral infarction underwent cranial MR imaging and MR angiography. MR imaging revealed chronic-stage left cerebellar and right basal ganglionic infarctions. MR angiography showed no steno-occlusive lesions in the intracranial arteries; however, duplicated left SCAs were observed and the caudal branch arose from the precavernous segment of the left internal carotid artery, which is indicative of a PTA variant.
    Discussion: Variations of the SCA (e.g., duplication, early bifurcation, and common trunk of the posterior cerebral artery and SCA) are frequently seen. A cerebellar artery arising from the precavernous segment of the internal carotid artery without connection to the basilar artery is regarded as a PTA variant. According to a meta-analysis, the prevalence is reported to be 0.2%. The majority of PTA variants are classified as the anterior inferior cerebellar artery type. PTA and PTA variants are frequently associated with other cerebral variations. A case of duplicated posterior inferior cerebellar artery, in which one of the branches was supplied by a PTA variant, was reported previously. However, the combination of duplicated SCA and PTA variants has not been reported.
    Conclusion: Using MR angiography, the author diagnosed a case of duplicated SCA, whose caudal branch was supplied by a PTA variant. No similar case has been reported in the relevant English-language literature.
    MeSH term(s) Female ; Humans ; Aged ; Basilar Artery/diagnostic imaging ; Magnetic Resonance Angiography ; Carotid Artery, Internal/diagnostic imaging ; Cerebral Arteries/diagnostic imaging ; Cerebral Infarction ; Cerebral Angiography
    Language English
    Publishing date 2022-12-12
    Publishing country Germany
    Document type Case Reports ; Meta-Analysis ; Journal Article
    ZDB-ID 632839-8
    ISSN 1279-8517 ; 0930-312X ; 0930-1038
    ISSN (online) 1279-8517
    ISSN 0930-312X ; 0930-1038
    DOI 10.1007/s00276-022-03057-9
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  5. Article ; Online: An extremely short posterior communicating artery diagnosed by magnetic resonance angiography.

    Uchino, Akira

    Surgical and radiologic anatomy : SRA

    2022  Volume 44, Issue 11, Page(s) 1467–1469

    Abstract: Purpose: To describe a case of an extremely short posterior communicating artery (PCoA) incidentally diagnosed by magnetic resonance (MR) angiography.: Case report: A 48-year-old woman with Parkinson's disease underwent cranial MR imaging and MR ... ...

    Abstract Purpose: To describe a case of an extremely short posterior communicating artery (PCoA) incidentally diagnosed by magnetic resonance (MR) angiography.
    Case report: A 48-year-old woman with Parkinson's disease underwent cranial MR imaging and MR angiography. MR imaging revealed no abnormality. After creating partial maximum-intensity-projection (MIP) images, MR angiography showed an extremely short right PCoA, only 4 mm long. The P1 segment of the right posterior cerebral artery (PCA) took an anterior course, and at the junction with the PCoA, the PCA made a hairpin turn and ran posteriorly. The length of the P1 segment was approximately 20 mm, which was relatively long.
    Discussion: According to an anatomical study using 170 cadaveric brains, the length of the PCoA ranged 5 to 26 mm (mean: 15 mm). Another 2 anatomical studies reported that the shortest PCoA was 7 mm. The present case had an extremely short right PCoA connecting with a hairpin turn at the P1-P2 junction, a unique configuration.
    Conclusion: To identify this variation by MR angiography, creation of partial MIP images was useful.
    MeSH term(s) Female ; Humans ; Middle Aged ; Magnetic Resonance Angiography/methods ; Circle of Willis ; Posterior Cerebral Artery/diagnostic imaging ; Imaging, Three-Dimensional ; Magnetic Resonance Imaging ; Cerebral Angiography ; Intracranial Aneurysm
    Language English
    Publishing date 2022-10-25
    Publishing country Germany
    Document type Case Reports ; Journal Article
    ZDB-ID 632839-8
    ISSN 1279-8517 ; 0930-312X ; 0930-1038
    ISSN (online) 1279-8517
    ISSN 0930-312X ; 0930-1038
    DOI 10.1007/s00276-022-03037-z
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  6. Article: [Fatty Density and Air].

    Uchino, Akira

    No shinkei geka. Neurological surgery

    2021  Volume 49, Issue 2, Page(s) 278–283

    Abstract: Both fat and air have lower attenuation than water on CT images. Excluding ruptured dermoid cysts, a majority of intracranial fats have no clinical significance. In contrast, intracranial air sometimes indicates serious conditions. If CT attenuation of ... ...

    Abstract Both fat and air have lower attenuation than water on CT images. Excluding ruptured dermoid cysts, a majority of intracranial fats have no clinical significance. In contrast, intracranial air sometimes indicates serious conditions. If CT attenuation of the lesion is apparently lower than that of the orbital fat, it can be regarded as an air bubble. T1-weighted MRI is useful for differentiating fat from air. Air in the subarachnoid space, called pneumocephalus, is a significant sign of serious head injury. In such cases, there may be cerebrospinal fluid leakage, and the risk of meningitis. Iatrogenic pneumocephalus is also observed, including lumbar puncture. Air in the artery is indicative of air embolism, which is a serious condition. It is caused by trauma and iatrogenic procedures. Both, right-to-left shunt in the heart and pulmonary arteriovenous fistula are risk factors for air embolism. Small air bubbles rapidly disappear from the arterial lumen. On the other hand, air in the dural sinuses is iatrogenic but usually asymptomatic. According to anatomical characteristics, air from the left hand easily migrates into the dural sinuses via the left internal jugular vein.
    MeSH term(s) Craniocerebral Trauma ; Humans ; Meningitis ; Orbit ; Pneumocephalus
    Language Japanese
    Publishing date 2021-03-24
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 197053-7
    ISSN 1882-1251 ; 0301-2603
    ISSN (online) 1882-1251
    ISSN 0301-2603
    DOI 10.11477/mf.1436204389
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  7. Article ; Online: Accessory posterior cerebral artery (hyperplastic anterior choroidal artery) associated with contralateral accessory middle cerebral artery incidentally diagnosed by magnetic resonance angiography.

    Uchino, Akira / Irie, Tadanobu

    Surgical and radiologic anatomy : SRA

    2024  Volume 46, Issue 3, Page(s) 313–316

    Abstract: Purpose: To describe a case of accessory posterior cerebral artery (PCA) [hyperplastic anterior choroidal artery (AChA)] associated with contralateral accessory middle cerebral artery (MCA) incidentally diagnosed by magnetic resonance (MR) angiography.!# ...

    Abstract Purpose: To describe a case of accessory posterior cerebral artery (PCA) [hyperplastic anterior choroidal artery (AChA)] associated with contralateral accessory middle cerebral artery (MCA) incidentally diagnosed by magnetic resonance (MR) angiography.
    Methods: A 71-year-old man with paroxysmal atrial fibrillation underwent cranial MR imaging and MR angiography of the intracranial region using a 1.5-T scanner for the evaluation of brain and vascular lesions.
    Results: On MR angiography, two right PCAs of equal size arose from the internal carotid artery instead of the basilar artery. Additionally, a small left MCA branch arose from the proximal A2 segment of the anterior cerebral artery (ACA).
    Conclusion: One of the branches of the PCA rarely arises from the AChA. This variation is referred to as a hyperplastic AChA or accessory PCA. The latter name was recently proposed and may be more appropriate than the former name. An MCA branch arising from the ACA is called an accessory MCA. It is a frontal branch of two types: proximal-origin and distal-origin. The distal-origin accessory MCA arises from the distal A1 segment, A1-A2 junction or proximal A2 segment. Distal-origin accessory MCAs are rare. Our patient had two rare variations: an accessory right PCA and a distal-origin accessory left MCA. To identify cerebral arterial variations, especially accessory MCA, volume-rendering images are more useful than maximum-intensity projection images on MR angiography.
    MeSH term(s) Male ; Humans ; Aged ; Carotid Artery, Internal ; Middle Cerebral Artery ; Magnetic Resonance Angiography ; Posterior Cerebral Artery/diagnostic imaging ; Cerebral Arteries ; Anterior Cerebral Artery/diagnostic imaging ; Cerebral Angiography
    Language English
    Publishing date 2024-02-06
    Publishing country Germany
    Document type Case Reports ; Journal Article
    ZDB-ID 632839-8
    ISSN 1279-8517 ; 0930-312X ; 0930-1038
    ISSN (online) 1279-8517
    ISSN 0930-312X ; 0930-1038
    DOI 10.1007/s00276-024-03298-w
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  8. Article ; Online: Intracavernous internal carotid artery-originating ophthalmic artery entering the orbit via the optic canal.

    Uchino, Akira

    Surgical and radiologic anatomy : SRA

    2021  Volume 43, Issue 12, Page(s) 1967–1968

    MeSH term(s) Carotid Artery Diseases ; Carotid Artery, Internal/diagnostic imaging ; Humans ; Ophthalmic Artery/diagnostic imaging ; Orbit/blood supply ; Orbit/diagnostic imaging ; Sphenoid Bone
    Language English
    Publishing date 2021-09-13
    Publishing country Germany
    Document type Letter
    ZDB-ID 632839-8
    ISSN 1279-8517 ; 0930-312X ; 0930-1038
    ISSN (online) 1279-8517
    ISSN 0930-312X ; 0930-1038
    DOI 10.1007/s00276-021-02835-1
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  9. Article ; Online: Right vertebral artery arising from the extreme proximal right subclavian artery and entering the third transverse foramen: CT angiographic demonstration.

    Uchino, Akira

    Surgical and radiologic anatomy : SRA

    2021  Volume 43, Issue 6, Page(s) 943–944

    MeSH term(s) Brachiocephalic Trunk ; Cervical Vertebrae/blood supply ; Computed Tomography Angiography ; Humans ; Subclavian Artery/diagnostic imaging ; Vertebral Artery/diagnostic imaging
    Language English
    Publishing date 2021-02-02
    Publishing country Germany
    Document type Letter
    ZDB-ID 632839-8
    ISSN 1279-8517 ; 0930-312X ; 0930-1038
    ISSN (online) 1279-8517
    ISSN 0930-312X ; 0930-1038
    DOI 10.1007/s00276-021-02692-y
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  10. Article ; Online: Posterior cerebral artery (PCA)-accessory PCA (hyperplastic anterior choroidal artery) anastomosis detected on magnetic resonance angiography.

    Uchino, Akira / Tokushige, Kazuo

    Surgical and radiologic anatomy : SRA

    2024  Volume 46, Issue 5, Page(s) 679–683

    Abstract: Purpose: To describe a case of posterior cerebral artery (PCA)-accessory PCA (hyperplastic anterior choroidal artery) anastomosis detected on magnetic resonance angiography.: Methods: A 76-year-old man with a history of cerebral infarction underwent ... ...

    Abstract Purpose: To describe a case of posterior cerebral artery (PCA)-accessory PCA (hyperplastic anterior choroidal artery) anastomosis detected on magnetic resonance angiography.
    Methods: A 76-year-old man with a history of cerebral infarction underwent cranial magnetic resonance (MR) imaging and MR angiography of the intracranial region for the evaluation of brain and vascular lesions. The MR machine was a 3-Tesla scanner. MR angiography was performed using a standard three-dimensional time-of-flight technique.
    Results: There were two right PCAs. The parieto-occipital and calcarine arteries of the right PCA arose from the right ICA, indicative of accessory PCA, and there were three stenotic lesions at the proximal segment of this artery. The temporal artery of the right PCA originated from the basilar artery. A small anastomotic channel between these two arteries was identified on partial maximum intensity projection (MIP) images. Computed tomography angiography was additionally performed and the findings were confirmed.
    Conclusion: We speculated that the pressure gradient between the PCA and the accessory PCA enlarged the anastomotic channel. Partial MIP images are useful for diagnosing small arterial variations using MR angiography.
    MeSH term(s) Humans ; Male ; Aged ; Posterior Cerebral Artery/diagnostic imaging ; Posterior Cerebral Artery/abnormalities ; Magnetic Resonance Angiography/methods ; Anatomic Variation ; Computed Tomography Angiography ; Imaging, Three-Dimensional
    Language English
    Publishing date 2024-03-26
    Publishing country Germany
    Document type Case Reports ; Journal Article
    ZDB-ID 632839-8
    ISSN 1279-8517 ; 0930-312X ; 0930-1038
    ISSN (online) 1279-8517
    ISSN 0930-312X ; 0930-1038
    DOI 10.1007/s00276-024-03350-9
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