Pseudotumor cerebri: disordered cerebrospinal fluid hydrodynamics with extra-axial CSF collections.

Pseudotumor cerebri is uncommon in the pediatric age group and presents with clinical characteristics different from the adult form. We report a 5-year-old boy who presented with--seemingly spontaneous--alternating subdural CSF collections before progressing to develop pseudotumor cerebri. To our knowledge, this is the first report of such a presentation.