RESUMO
A comparative study between magnetic resonance (MR) and computed tomography (CT) showed MR to be more sensitive than CT for detecting subacute and chronic hemorrhage into cerebral infarction. The hemorrhage appeared as either high signal on T1 weighted images or low signal on T2 weighted images, depending on the age of the hemorrhage. Cortical hemorrhagic infarction showed a characteristic gyral pattern. Methemoglobin and hemosiderin served as markers of previous hemorrhage into cerebral infarcts.
Assuntos
Hemorragia Cerebral/complicações , Infarto Cerebral/diagnóstico , Imageamento por Ressonância Magnética , Adolescente , Adulto , Idoso , Encéfalo/diagnóstico por imagem , Encéfalo/patologia , Hemorragia Cerebral/diagnóstico por imagem , Infarto Cerebral/diagnóstico por imagem , Infarto Cerebral/etiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Tomografia Computadorizada por Raios XRESUMO
Magnetic resonance imaging (MRI) was performed on 30 patients with cerebral symptoms before and after intravenous gadolinium-DTPA (Gd-DTPA) administration. T1 and T2 weighted images were obtained in all patients. Fifty abnormalities were found in 27 patients. The post-contrast images revealed lesions not seen on pre-contrast scans in 6 patients. Also, the post-contrast images showed a change in morphology of the lesions in 15 that provided additional information for assessing the abnormality. The Gd-DTPA did not obscure any of the lesions seen on pre-contrast scans. Gd-DTPA improves conspicuity, helps characterize and delineate the extent of lesions and increases the sensitivity for detection of cerebral abnormalities.
