Isolated cerebellar atrophy
An epileptic patient with chronic phenytoin use.
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Diffuse cerebellar atrophy inappropriate with patient's age due to chronic phenytoin use.
Note the normal cerebral hemispheres.
Phenytoin induced cerebellar atrophy occurs after prolonged exposure to phenytoin, usually for the treatment of epilepsy.
Radiologic features of isolated cerebellar atrophy:
- diffuse cerebellar volume loss
- ex-vacuo dilatation of the fourth ventricle
- prominence of the cerebellar folia
- normal cerebral hemispheres