File:Arachnoid cyst - cerebellopontine angle (Radiopaedia 59689-67083 Axial SWI 1).png

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Arachnoid_cyst_-_cerebellopontine_angle_(Radiopaedia_59689-67083_Axial_SWI_1).png ‎(336 × 384 pixels, file size: 61 KB, MIME type: image/png)

Summary:

Description
  • Radiopaedia case ID: 59689
  • Image ID: 37859860
  • Image stack position: 1/88
  • Plane projection: Axial
  • Aux modality: SWI
  • Study findings: As demonstrated on the preceding CT scan, within the right cerebellopontine angle is a well-circumscribed CSF intensity lesion with bony remodeling of the petrous apex and indentation of the middle cerebellar peduncle. Content follows CSF on all sequences including diffusion-weighted imaging. No abnormal enhancement. The seventh and eighth cranial nerves are displaced anteriorly. The ventricles are unremarkable in appearance with no evidence of a hydrocephalus. Conclusion: Right cerebellopontine angle arachnoid cyst.
  • Modality: MRI
  • System: Central Nervous System
  • Findings: A CSF density lesion in the right cerebellopontine angle, with moderate local mass effect with mild displacement of the brainstem but no effacement of the fourth ventricle. No widening of the adjacent porus acousticus. Remodeling of the adjacent bone is, however, present. Conclusion: Right cerebellopontine angle cystic lesion most likely represents an incidental arachnoid cyst with a differential diagnosis that includes epidermoid cyst or cystic acoustic neuroma (the latter two are thought less likely).
Date Published: 25th Apr 2018
Source https://radiopaedia.org/cases/arachnoid-cyst-cerebellopontine-angle-3
Author Frank Gaillard
Permission
(Permission-reusing-text)		 http://creativecommons.org/licenses/by-nc-sa/3.0/

Licensing:

Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)

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