File:Chiari 1.5 malformation (Radiopaedia 70264-80337 Sagittal T2 11).jpg

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Summary:

Description	Radiopaedia case ID: 70264 Image ID: 51306522 Image stack position: 11/12 Plane projection: Sagittal Aux modality: T2 Modality: MRI System: Spine Findings: MRI demonstrates elongated and descent of the cerebellar tonsils that extend approximately 11 mm below the foramen magnum along with brain stem (obex) herniation, causing flattening of the medulla anteroposteriorly. The inferior displacement of the cerebellar tonsils measured concerning the McRae line, drawn from the anterior margin (basion) to the posterior margin (opisthion) of the foramen magnum. There is a dorsal bump at the cervicomedullary junction, and crowding at the foramen magnum due to the descent of cerebellar tonsils. The osseous abnormalities associated are platybasia (the basal skull measures 145º), basilar invagination (protrusion of the odontoid tip of 7 mm above the Chamberlain line), hypoplastic clivus, retroflexion of the odontoid process.
Date	Published: 11th Aug 2019
Source	https://radiopaedia.org/cases/chiari-15-malformation-4
Author	Antonio Rodrigues de Aguiar Neto
Permission (Permission-reusing-text)	http://creativecommons.org/licenses/by-nc-sa/3.0/

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:50, 7 August 2021		1,324 × 1,324 (210 KB)	Fæ (talk \| contribs)	Radiopaedia project rID:70264 (batch #7411-23 B11)

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