 |
| Axial T2 |
 |
| Axial Flair |
 |
| Axial T1 |
 |
| Axial T1 post gad |
 |
| DWI |
Most important differential:
Epidermoid Cyst (sebaceous cyst).
Differentiating points:
1. Arachnoid cyst shows no restriction on DWI, Epidermoids highly restrict!
2. Arachnoid cysts lose signal on FLAIR (iso to CSF), while epidermoids will be hyper to CSF on FLAIR.
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