PMC9310222_01
(a) T1-weighted sagittal, (b) T2 axial, (c) T2 coronal, and (d) T2 FLAIR-weighted axial images showing a regular, lobulated lesion adjacent to the left optic nerve, isointense to CSF and presenting a communication with left optic nerve sheaths (c) (arrow).
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Weighted axial and coronal images demonstrate a hyper intense regular, lobulated cystic lesion within the left intraconal orbit in the area of the left ON that loses signal on T2 FLAIR sequence and appears to be communicating with the homolateral temporal sub-arachnoidian spaces through the superior orbital fissure (Figure 1).
(a) DWI showed no restriction of diffusion in the cystic mass (b) with no enhancement on post-contrast T1-weighted images.
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Diffusion-weighted images (DWIs) show no restriction of diffusion in the cystic mass (Figure 2(a)). There is no enhancement on post-contrast T1-weighted images (Figure 2(b)).