fig 2.

Images obtained 2 years 9 months after initial MR examination.

A, Axial T1-weighted MR image shows that the cystic mass has isointensity and has increased in size.

B, T2-weighted MR image shows that the cyst has higher intensity than CSF.

C, Diffusion-weighted image shows that the mass has low intensity. The finding may enable differentiation from epidermoid cyst, which can show similar intensities on T1- and T2-weighted MR images but shows iso- or hyperintensity compared with brain on diffusion-weighted images.