Residual/recurrent ganglioglioma (WHO Grade I), resection of posterior fossa lesion. STEALTH MRI with fiducial placement for surgery. Surgical planning MRI sequences demonstrate a heterogeneous mass within the left lateral aspect of the fourth ventricle, which measures up to 20 mm. Otherwise, there are post-treatment findings in the posterior fossa with diffuse bilateral cerebellar encephalomalacia and associated enlargement of fourth ventricle. There is also unchanged mild prominence of the third and lateral ventricle. There is no midline shift or herniation. There are skin-based fiducial markers.
Surgical planning MRI sequences demonstrate a heterogeneous mass within the left lateral aspect of the fourth ventricle, which measures up to 20 mm. Otherwise, there are post-treatment findings in the posterior fossa with diffuse bilateral cerebellar encephalomalacia and associated enlargement of fourth ventricle. There is also unchanged mild prominence of the third and lateral ventricle. 