الفهرس 
ACKNOWLEDGEMENTOnly 14 pages are availabe for public view
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Abstract
ntroduetfon: Cerebrovascular diseases are the most common cause pf pathology affecting the brain. Angiography has been considered the most important radiologic procedure for the evaluation of these lesions. In the Current era of noninvasive imaging there has been a shift in emphasis away from invasive imaging tests such as cerebral ~giography toward noninvasive means such as CT and MRI. Aim of the work: The aim of this work is to asses the role of MRI in the evaluation of intracranial vascular lesions. Materials & Methods: This study included 111 patients. There were 67 females and 44 males. Their age ranged from 3 days to 86 years. All patients were examined with MRI (SE imaging), 67 patients were examined with MRA and 11 patients With MRV. Cerebral angiography twas done for 54 patients and CT was done for 20 other patients. The .results of the MRI (SE and MRA) studies were compared with those of cerebral angiography, CT and/or the clinical follow up of the patients. Results: The patients were divided into 4 main groups according to their final diagnosis; 1- Cerebrovascular occlusive diseases (CVOD): A-Acute cerebral infarction: MRi showed a sensitivity of 85% , compared with 60% for CT, in the diagnosis of acute cerebral; infarction in the first 24 hours. B- Sickle cell disease: MRA, compared with cerebral angiography, made the correct diagnosis in 84% of the vessels of the carotid circulation with a sensitivity and specificity of 820/0 and 93% respectively. II- Cerebral venous thrombosis: MRV is a better diagnostic test than SE imaging for the initial diagnosis and follow up of cerebral venous thrombosis. The combined use of both techniques enables a confident and easy diagnosis of these lesions. III - Aneurysms: MRI (SE and MRA) is inferior to cerebral antography in the detection of cerebral aneurysms, especially those smaller than 5 mm.