Intractable epilepsy as the initial manifestation of neurosyphilis.

A 29-year-old man experienced intractable partial seizures as the initial manifestation of neurosyphilis. The diagnosis was made after the onset of dementia 9 months later. Both the epilepsy and dementia resolved with penicillin therapy. Syphilis should be considered in patients with adult-onset focal epilepsy, particularly if there is associated dementia. Treatment may be successful even when the diagnosis is delayed.