File:Basilar impression (Radiopaedia 52411-58522 B 86).jpg

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Summary:

Description	Radiopaedia case ID: 52411 Image ID: 29763560 Image stack position: 86/175 Study findings: Unfortunately CT quality was poor due to technical issues. Approximately 15 mm cranial migration of dens was noted.There is right side rotation of upper cervical spine raising possibility of rupture of transverse ligament , atalnto-occipital ligament, and antlanto-axial ligaments . Modality: CT System: Central Nervous System Findings: Altered marrow signal (hyperintense onT2W and hypointense on T1W images) is seen C1 and C2 vertebrae with erosion of cortex. There is apprximately 15 mm cranial migration of dens and is compressing medulla causing white matter edema. There is right side rotation of upper cervical spine. Transverse ligament, atalnto-occipital ligament, and antlanto-axial ligaments are obscured, possible ruptured. Extensive soft tissue thickening is seen in pre and paravertebral spaces at 1st and 2nd levels. Incidentally T1 hyperintense 'V' or crescent shaped fluid collection is noted in the subretinal space.This is diagnostic of blood.The apex of the V is attached to the optic disc and the limbs are attached anteriorly to the ora serrata.
Date	Published: 17th Apr 2017
Source	https://radiopaedia.org/cases/basilar-impression
Author	Sagar Shetty
Permission (Permission-reusing-text)	http://creativecommons.org/licenses/by-nc-sa/3.0/

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:06, 8 June 2021		1,474 × 353 (65 KB)	Fæ (talk \| contribs)	Radiopaedia project rID:52411 (batch #3770-136 B86)

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