The authors report an adult patient with a symptomatic interhemispheric cyst demonstrated by computerized tomography (CT), angiography, and at surgery. Choroid plexus epithelium was identified arising from the inner aspect of the cyst wall. Partial agenesis of the corpus callosum is postulated on the basis of the CT findings and the presence of choroid plexus in the interhemispheric cyst.
The authors report an adult patient with a symptomatic intracranial meningioma that was demonstrated by computerized tomography, angiography, and at surgery. The meningioma had occurred at a site where 19 years previously thorium dioxide had been injected into an abscess cavity. Pathological examination revealed the presence of thorium granules within the meningioma.
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