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  • 1
    ISSN: 1279-8517
    Keywords: Vascular model ; Methodology ; Reproducibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An in vitro model of the main human cerebral arteries with or without saccular arterial aneurysms is presented. A cast of the cerebral arteries was obtained in a human specimen. Three aneurysms were simulated and added to the cast. Wax copies of the cast were produced, and embedded with liquid resin solidifying into solid blocks. After evacuation of the wax, a model consisting of a hollow reproduction of the cast within the resin block was obtained. The model is reproducible and anatomically accurate. Since it is transparent to visible light, and compatible with x-ray, magnetic resonance and transcranial doppler techniques, it should prove useful for a wide range of haemodynamic and radiologic investigations. The reported technique may be adapted to any structure with a hollow configuration, allowing for the preparation of arterial and venous models from other vascular areas, as well as models from other anatomic systems, such as the biliary or urinary tracts.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1279-8517
    Keywords: Vascular model ; Methodology ; Reproducibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Un modèle in vitro des principales artères cérébrales humaines avec ou sans anévrysmes artériels sacciformes est présenté. Un moulage par corrosion des artères cérébrales fut obtenu sur un specimen humain. Trois anévrysmes furent simulés et ajoutés à ce moulage. Des copies en cire de ce montage furent produites, puis enrobées d'une résine liquide se solidifiant en blocs transparents. Après évacuation de la cire, un modèle consistant en une reproduction «en creux» de l'arbre vasculaire original dans un bloc transparent fut obtenu. Ce modèle est reproductible et anatomiquement réaliste. Comme il est transparent à la lumière visible et compatible avec les techniques d'imagerie moderne (angio-graphie numérisée, TDM, IRM, Doppler transcrânien), ce modèle devrait se révêler utile dans le cadre d'investigations de type hémodynamique et radiologique. La méthodologie décrite peut être appliquée à toute structure anatomique de configuration creuse, permettant la préparation de modèles artériels et veineux de régions anatomiques diverses, ainsi que de modèles basés sur d'autres systèmes anatomiques à l'exemple des voies biliaires ou urinaires.
    Notes: Summary Anin vitro model of the main human cerebral arteries with or without saccular arterial aneurysms is presented. A cast of the cerebral arteries was obtained in a human specimen. Three aneurysms were simulated and added to the cast. Wax copies of the cast were produced, and embedded with liquid resin solidifying into solid blocks. After evacuation of the wax, a model consisting of a hollow reproduction of the cast within the resin block was obtained. The model is reproducible and anatomically accurate. Since it is transparent to visible light, and compatible with x-ray, magnetic resonance and transcranial doppler techniques, it should prove useful for a wide range of haemodynamic and radiologic investigations. The reported technique may be adapted to any structure with a hollow configuration, allowing for the preparation of arterial and venous models from other vascular areas, as well as models from other anatomic systems, such as the biliary or urinary tracts.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1279-8517
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Conclusion Un modèle anatomique in vitro des artères cérébrales est présenté. Ce modèle est hautement reproductible et restitue l'arbre artériel humain dans sa complexité. Des anévrysmes sacciformes secondairement implantés sur le moulage artériel sont présentés comme exemple de pathologies qui peuvent être simulées sur ce modèle. Le modèle est obtenu avec un faible coût de production. Il est transparent à la lumière visible, et compatible avec les techniques radiologiques faisant appel aux rayons X, à l'imagerie par résonance magnétique et au Doppler transcrânien. Ce modèle devrait donc se révêler utile comme outil d'investigation hémodynamique et radiologique, ainsi que comme support d'enseignement.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1084
    Keywords: Key words: Pituitary apoplexy ; Pituitary hemorrhage ; Pituitary tumors ; MR imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was to describe the various MRI features, in correlation to surgical and pathological findings, in patients who presented with pituitary apoplexy (PA). Eleven patients presenting with PA, were evaluated with various MR protocols including spin-echo (SE) T1-weighted sequences in 9 of 11 patients, post gadolinium SE T1-weighted sequences in only 8 of 11 patients, and with T2-weighted SE sequences in 2 of 11 patients. All patients had transsphenoidal pituitary surgery after MR studies. The severity of presenting symptoms ranged from headaches to coma. Ten patients had pituitary macroadenoma; one had a non-hemorrhagic metastatic lesion into a non-adenomatous pituitary gland. Of the 11 patients, one was studied at the acute stage of PA (1 day after onset), 9 at the subacute period (3–15 days after onset), and one at the late stage (5 months after onset). Images compatible with intratumoral hemorrhage were found in all macroadenomas, whereas the metastatic pituitary lesion did not show evidence of bleeding. All gadolinium-enhanced studies showed partial tumoral enhancement. The SE T2-weighted studies demonstrated areas of low and high signal intensities in keeping with the presence of blood degradation contents. Pituitary apoplexy present with different MR features, including hemorrhagic and non-hemorrhagic characteristics on T1-weighted images. Gadolinium-enhanced images do not provide complementary diagnostic information when the presence of blood is assessed on plain images.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1920
    Keywords: Key words Artery ; trigeminal ; Arteries ; anomalies ; Magnetic resonance imaging ; Magnetic resonance angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe the MRA and MR angiography (MRA) features of persistent trigeminal artery (PTA) found incidentally in eight patients, with special attention to its origin, site and course. The different patterns of posterior communicating arteries were also noted. The PTA were shown on sagittal, coronal and axial MRI and on MRA. In four cases, the PTA arose from the lateral aspect of the intracavernous internal carotid artery, ran caudally, passing round the bottom of the dorsum sellae to join the basilar artery. In the other four cases, it arose from the medial aspect, ran caudally through the sella turcica and pierced the dorsum sellae to join the basilar artery. The posterior communicating arteries were present unilaterally in five cases and bilaterally in one, and absent bilaterally in two. Identification of a PTA with a trans-sellar course is crucial if a trans-sphenoidal surgery is planned.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1920
    Keywords: Key words Brain ; Computed tomography ; Magnetic resonance imaging ; Echinococcosis multilocularis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cerebral alveolar echinococcosis is rare and has a poor prognosis. We report an unusual case presenting with disseminated intracranial lesions secondary to primary hepatic infection.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1920
    Keywords: Key words Sinuses ; dural ; Epidermoid cyst ; skull ; Magnetic resonance imaging ; Tinnitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report an intradiploic epidermoid cyst of the skull responsible for transverse sinus compression and presenting with nonpulsatile tinnitus. Plain films and CT both demonstrated the tumour. Cerebral angiography showed best the degree of narrowing of the right transverse sinus, accompanied with turbulent flow probably leading to tinnitus. MRI demonstrated accurately both the tumour and the dural sinus compression. The tumour was totally removed, cranioplasty was performed, and the patient was discharged free of symptoms.
    Type of Medium: Electronic Resource
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