RESUMO
Angio-tomography is a selective radiological method which can be used to complement serial angiographs in order to demonstrate better detail. This results from the fact that selective levels can be demonstrated without super-imposition of bone or other vessels. Angio-tomography combines the advantages of tomography, subtraction and selective procedures. The method has been used for all types of intracranial disease; aneurysms and angiomas are the most common conditions for which angio-tomography has been employed. The present paper is based on a total of 60 cerebral aneurysms and angiomas in various situations; angiotomography was indicated for these amongst a larger material of intracranial vascular malformations in which the diagnosis was possible without its use. The indications consist of: 1) Demonstration of very small aneurysms and their differentiation from vessel loops, 2) Demonstration of the origin of an aneurysm which is situated at the confluence of several major vessels, 3) Point of origin of a so-called hugeaneurysms which cannot otherwise be shown by oblique views, 4) Demonstration of so-called micro-angiomas and of the afferent and efferent vessels in central arterio-venous malformations. Unusual aneurysms of the internal carotid artery, of the anterior choroidal and vertebral arteries are described. Some new concepts in the localisation of aneurysms of the anterior communicating artery are discussed. Many of the examinations were carried out with an angio-tomographic apparatus made in the department.
Assuntos
Neoplasias Encefálicas/diagnóstico por imagem , Hemangioma/diagnóstico por imagem , Aneurisma Intracraniano/diagnóstico por imagem , Artéria Basilar , Doenças das Artérias Carótidas/diagnóstico por imagem , Artéria Carótida Interna , Angiografia Cerebral/métodos , Artérias Cerebrais , Humanos , Tomografia por Raios X/métodos , Artéria VertebralRESUMO
Serial angiotomography is a selective investigative method which contributes to exact differential diagnosis and localization of the tumor. With the localization near the midline of the supratentorial tumors it can occasionally be the only arteriographical method which will bring a definite result. With basal processes the relationship of the tumor to the bones and dura can be demonstrated more accurately. In addition angiotomography brings new haemodynamic aspects with regard to the circulation time and intensity of the tumor stain of glioblastoma.
Assuntos
Neoplasias Encefálicas/diagnóstico por imagem , Angiografia Cerebral/métodos , Tomografia por Raios X/métodos , Angiografia Cerebral/instrumentação , Dura-Máter , Humanos , Tecnologia Radiológica , Tomografia por Raios X/instrumentaçãoRESUMO
The present paper reviews changes in the vessel wall in the carotid syphon, including variations in calibre, stenoses, post-stenotic dilatation and aneurysms. Particular attention is paid to a supraclinoid circular stenosis, which corresponds in its localisation to the emergence of the internal carotid artery from the dura. Reference is made to new anatomical findings in this region. The haemodynamic basis of poststenotic dilatations and the development of acquired aneurysms as a result of this mechanism are discussed. Examples of post-stenotic aneurysms are demonstrated.
