Figure 15. Epidermoid cyst in the left cerebellopontine angle, CSF signal intensity. (a) Axial plane T₁ weighted SE section at the level of upper medulla. Apparent widening of the cistern on the left side (arrow). (b) Coronal plane T₁ weighted SE image. Apparent asymmetry of the cisterns is due to the presence of an epidermoid cyst. The left trigeminal nerve is displaced superiorly (arrow).

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