MRI
Axial T2
Axial FLAIR
Axial DWI
Axial ADC
Axial T1
Sagittal T2
Coronal T2
Extra-axial mass with that follows CSF signal on all sequences. Mild mass effect at right middle cranial fossa is seen. There is no restricted diffusion, no solid component, and no enhancement.
Features are characteristic of an arachnoid cyst.