Question 1354
{"accessible":false,"alternatives":[{"id":6753,"text":"Alzheimer disease"},{"id":6754,"text":"behavioural variant frontotemporal dementia"},{"id":6755,"text":"language variant frontotemporal dementia"},{"id":6756,"text":"normal pressure hydrocephalus"},{"id":6757,"text":"posterior cortical atrophy"}],"archived":false,"correctAlternativeId":6756,"explanation":"\u003cp\u003eAlthough any disease resulting in atrophy of the frontal and/or temporal lobes will potentially widen the Sylvian cistern and fissure, they will not change the callosal angle.\u0026nbsp;\u003c/p\u003e\u003cp\u003eIn contrast, in normal pressure hydrocephalus, there is a\u0026nbsp;combination of ventriculomegaly, Sylvian fissure widening, and crowding of gyri at the vertex (termed\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/disproportionately-enlarged-subarachnoid-space-hydrocephalus-desh?lang=gb\"\u003edisproportionately enlarged subarachnoid space hydrocephalus\u003c/a\u003e).\u0026nbsp;This reflects disproportionality between the superior and inferior CSF spaces and narrows the callosal angle.\u0026nbsp;\u003c/p\u003e","id":1354,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1354","nextQuestionPath":null,"relatedArticles":[{"id":6306,"title":"Normal pressure hydrocephalus","link":"/articles/normal-pressure-hydrocephalus?lang=gb"},{"id":13001,"title":"Neurodegenerative disease","link":"/articles/neurodegenerative-disease?lang=gb"},{"id":28361,"title":"Neurodegenerative MRI brain (an approach)","link":"/articles/neurodegenerative-mri-brain-an-approach?lang=gb"},{"id":68134,"title":"Disproportionately enlarged subarachnoid space hydrocephalus (DESH)","link":"/articles/disproportionately-enlarged-subarachnoid-space-hydrocephalus-desh?lang=gb"}],"alsoUsedIn":[{"id":497,"kind":"Course","title":"Neurodegenerative Learning Pathway - page 497","link":"https://radiopaedia.org/courses/neurodegenerative-learning-pathway/pages/497"},{"id":1059,"kind":"Course","title":"Neurodegenerative Learning Pathway - page 1059","link":"https://radiopaedia.org/courses/neurodegenerative-learning-pathway/pages/1059"}],"stem":"\u003cp\u003eReduced callosal angle combined with a disproportionate\u0026nbsp;increased size of the Sylvian cisterns and fissures are most likely seen in which of the following conditions?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/1354"}],"attemptsPercentages":[{"alternativeId":"6757","percentage":1},{"alternativeId":"6753","percentage":2},{"alternativeId":"6756","percentage":94},{"alternativeId":"6755","percentage":1},{"alternativeId":"6754","percentage":2}],"promptToLogin":false,"questionManager":false,"articleId":"callosal-angle"}