RESUMO
Magnetic resonance imaging (MRI) can visualize the extent of corpus callosotomy performed for medically intractable epilepsy not amenable to focal surgery. Five patients underwent complete callosotomy and one an anterior callosotomy, aged 19 to 24 years, 21 to 53 months (prior to scanning). T1 images showed complete absence of the callosal shadow in five cases and visualization of the genu and splenium in the sixth case. T2-weighted pulse sequence spin-echo MRI showed intense image throughout the region of the entire callosum in the two cases with the longest postoperative course. The two middle cases showed intense T2 signal from the splenium, and the two latest showed no increase in T2 signal. We believe the increase in T2 signal in the transected callosum may represent an in vivo example of anisomorphic gliosis. T1 images demonstrate the anatomic extent of transection, while T2 images demonstrate the chemical and pathophysiologic sequence of transection. Thus, MRI is the imaging test of choice to evaluate callosotomy patients.
Assuntos
Corpo Caloso/cirurgia , Espectroscopia de Ressonância Magnética , Adolescente , Adulto , Corpo Caloso/anatomia & histologia , Humanos , Período Pós-OperatórioRESUMO
In an 11-year-old girl who had repeated episodes of aspiration pneumonia, no lateral ventricles and no third or fourth ventricle could be identified on T1-, T2-, or proton density-weighted MR images. This condition was associated with failure of midline cleavage of the cerebral hemispheres, rhombencephalosynapsis, and complex migrational disorders.
Assuntos
Anormalidades Múltiplas/diagnóstico , Encéfalo/anormalidades , Ventrículos Cerebrais/anormalidades , Holoprosencefalia/diagnóstico , Imageamento por Ressonância Magnética , Encéfalo/patologia , Ventrículos Cerebrais/patologia , Criança , Feminino , Humanos , Pneumonia Aspirativa/congênito , RecidivaRESUMO
A case of ruptured intracranaial dermoid cyst in the right middle fossa is reported. A definitive diagnosis of the lesion and the fact that it had ruptured was made possible by specific computerized tomographic findings. The findings were confirmed at surgery.
Assuntos
Neoplasias Encefálicas/diagnóstico por imagem , Cisto Dermoide/diagnóstico por imagem , Tomografia Computadorizada por Raios X , Adulto , Neoplasias Encefálicas/cirurgia , Cisto Dermoide/cirurgia , Humanos , Masculino , Ruptura EspontâneaRESUMO
We present two cases of posterior ocular staphylomas in axial myopia. CT findings of an enlarged globe with focal posterior bulging and scleral-uveal rim thinning appear to be specific for this diagnosis.