PMC9909362_01
Sagittal (A) and axial (B) view of the contrasted CT images of the brain shows fluid density lesion in the posterior fossa region (red arrow).
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FIG1
A well-defined non-enhancing hypodense lesion at the retro-cerebellar area was seen on the Computed Tomography (CT) scan (Figures 1A, 1B), which strongly suggests an arachnoid cyst.
A cystic lesion in the posterior fossa (arrow A) with similar signal intensity as the CSF in the fourth ventricle (arrow B) shown in MRI in different views.. I: T1-weighted image, II: T2-weighted image, III: Flair sequence image, IV: Post-gadolinium image
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FIG2
The MRI showed the presence of a well-circumscribed left retro-cerebellar lesion which follows the CSF signal intensity in all sequences (Figure 2).