Peculiar neuroimaging and electrophysiological findings in a patient with biotinidase deficiency.

We report a patient with biotinidase deficiency with peculiar findings on her MRI brain. Subcortical cysts combined with Dandy Walker cyst on the brain MRI have never been reported. There are many documented case reports of biotinidase deficiency and several of them have included findings on neuroimaging. Subcortical cysts have been documented in one patient with biotinidase deficiency previously and on autopsy in one other patient. Video EEG on the same patient showed evidence of symptomatic generalized epilepsy.