14-year-old male with history of syncope and new right-sided limp. The cerebellar tonsils extend down to the level of the foramen magnum, raising the question of tonsillar herniation. This could be better evaluated on MRI.There is no evidence of intracranial hemorrhage, mass or edema. The ventricles and basal cisterns are normal in size and configuration.The calvaria and skull base are radiographically normal. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
Question of low lying cerebellar tonsils which could be better evaluated on MRI. Otherwise, unremarkable examination.