File:Atlanto-occipital assimilation (Radiopaedia 50208-55554 Sagittal T2 6).jpg

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Description	Radiopaedia case ID: 50208 Image ID: 27282332 Image stack position: 6/13 Plane projection: Sagittal Aux modality: T2 Study findings: The right sided atlanto-occiptal assimilation is well seen again. There is downward herniation of the cerebellar tonsils over a length of 11.5 mm from the foramen magnum level, in keeping with Chiari type I malformation. No syringomyelia/hydrocephalus. There is a moderate sized well defined, thin walled cystic lesion noted in the right cerebello-pontine angle. This lesion follows CSF signal on all sequences. Mass effect noted in the form of compression of adjacent cerebellar hemisphere. No internal solid components. No restriction on ADC/DWI images. Features suggestive of arachnoid cyst. No features of bone remodeling. Special thanks: Dr. Anand H.K Modality: MRI System: Head & Neck Findings: There is fusion of the anterior arch of the atlas with clivus and posterior arch with occiput on the right side, identical with complete atlanto-occiptal assimilation on the right side. The posterior arch shows incomplete fusion centrally, failing to form posterior tubercle. This assimilation causes secondary widening of the atlantodental space contralaterally.
Date	Published: 29th Dec 2016
Source	https://radiopaedia.org/cases/atlanto-occipital-assimilation-1
Author	Shailaja Muniraj
Permission (Permission-reusing-text)	http://creativecommons.org/licenses/by-nc-sa/3.0/

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