Diagnosis criteria of borderline forms of multiple sclerosis

\Border forms of multiple sclerosis (MS) can be separated in two groups: ei ther they are variants of MS or they. are distinct from MS but they share s everal characteristics with MS thus representing for some of them a continu um with MS. All these entities are central nervous system demyelinating dis eases. Here we describe, for the first group, MS in childhood, MS in elderl y subjects, Balb's concentric sclerosis, Schilder's myelinoclastic diffuse sclerosis and MS simulating a mass lesion, and for the second group, acute disseminated encephalomyelitis and Devic's neuromyelitis optica.