Abstract
Paraneoplastic cerebellopathies are immune-mediated disorders targeting primarily the cerebellar circuitry, often presenting in a subacute course. The syndrome often develops before the cancer. Therefore, its identification often leads secondarily to a diagnosis of cancer, a critical step to stabilize symptoms. Two categories of antibodies have been identified these last 30years: (a) onconeuronal antibodies which are directed against intracellular antigens, and (b) antibodies which are directed against synaptic and cell surface proteins. These latter impact on the location and function of the antigens, causing a genuine neuronal dysfunction. Appropriate and fast tumor screening has emerged as a recommendation facing a subacute cerebellar syndrome suspected to be paraneoplastic. Search for antibodies is now a milestone for the diagnosis.
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