Radiopaedia.org

There's a large heterogeneous space occupying lesion at the left cerebellar hemisphere and the left side of the vermis superiorly, distorting the left middle cerebellar peduncle. It compresses and attenuates the 4^th ventricle with consequent moderate dilatation of the supra-tentorial ventricular system and periventricular CSF permeation. It exerts positive mass effect in the form of anterior displacement of the pons and medulla with obliteration of the the pre-pontine cistern , and inferior cerebellar tonsillar herniation through the foramen magnum with consequent upper cervical cord syrnix. The lesion has a striking striated appearance on T2 WI. On DWI, the lesion shows high signal intensity. Corresponding ADC map shows no restricted diffusion. No significant post contrast enhancement.

Radiological findings are suggestive of left cerebellar Lhermitte-Duclos disease.