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[Multiple sclerosis--the great imitator!].

Multiple sclerosis (MS) is traditionally a clinical diagnosis based on relapsing and remitting multifocal CNS symptoms. In recent years new diagnostic tools such as cerebrospinal fluid analysis, magnetic resonance imaging and evoked potential testing have been developed. This article reviews diagnostic difficulties and discusses other medical conditions that can be mistaken for MS due to similar clinical, laboratory or radiological findings.