Arachnoid cyst - middle cranial fossa

Case contributed by Frank Gaillard
Diagnosis certain

Patient Data

Age: Young adult
Sagittal
T1
Axial
T2
Axial T1
C+ fat sat
Axial
T1
Axial
FLAIR
Axial
DWI
Download
Info

A region of CSF intensity which expands the middle cranial fossa and displaces the temporal lobe posteriorly. There is no restricted diffusion, no solid component and no enhancement. Features are characteristic of an arachnoid cyst. 

Case Discussion

This arachnoid cyst would fall into the type 2 Galassi classification (not that anyone uses it in practice).

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