File:Arachnoid cyst - cerebellopontine angle (Radiopaedia 78091-90607 Axial T2 3D CISS 39).jpg

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Summary:

Description
  • Radiopaedia case ID: 78091
  • Image ID: 53232209
  • Image stack position: 39/56
  • Plane projection: Axial
  • Aux modality: T2 3D CISS
  • Modality: MRI
  • System: Central Nervous System
  • Findings: Right cerebellopontine angle arachnoid cyst is noted reaching 17 mm mildly stretching the inferior aspect of the cisternal portion of the right trigeminal nerve. No related mass effect upon the 7th/8th cranial nerves complex or the other lower cranial nerve. A (12mm) well-defined right para-sagittal ovoid cystic lesion noted immediately inferior to the frontal horn right lateral ventricle, just anteromedial to the foramen of Monro, showing CSF signal, yet without complete suppression at FLAIR. No diffusion restriction or post-contrast enhancement. No related obstruction of the frontal horn, suggestive of benign cystic lesion (e.g ependymal cyst). A ring-shaped intraventricular nodule is noted at the frontal horn of the left lateral ventricle, a benign incidental finding. Another (15mm)  well defined cystic lesion noted at the right parietal deep white matter showing pure CSF signal, with complete suppression at FLAIR. No diffusion restriction or post-contrast enhancement. No peri-lesional edema or white matter signal abnormalities. It is surrounded by a cluster of tiny cysts. Features are consistent with enlarged Virchow-Robin spaces.
Date Published: 4th Aug 2020
Source https://radiopaedia.org/cases/arachnoid-cyst-cerebellopontine-angle-8
Author Mostafa El-Feky
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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