Aberrant arachnoid granulation

Case contributed by Dr Mostafa El-Feky



Patient Data

Age: 15 years
Gender: Male


Normal brain study.

A well-defined CSF-containing sac like structure is seen protruding into left occipital dura with related scalloping of occipital bone with no diffusion restriction, suggestive of an aberrant arachnoid granulation.


Annotated images

Arrows point to the arachnoid granulation.

Case Discussion

MRI features are suggestive of left sided occipital aberrant arachnoid granulation, that penetrated the dura. It is an incidental finding and not related to patient's complain. 

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Case information

rID: 82879
Published: 10th Oct 2020
Last edited: 11th Oct 2020
Inclusion in quiz mode: Included

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