Paraneoplastic Isaacs syndrome is a rare disorder with distinct clinical and electromyographic characteristics. It is a consequence of neoplastic process that is not directly caused by the tumor itself, but usually mediated by immune response primarily against the tumor and neural tissues are damaged owing to bystander effect. Paraneoplastic neurologic disorders may precede cancer diagnosis. Here we report the case of 75-year-old woman who presented with numbness, tingling sensation, and weakness of lower extremities, and was diagnosed with Isaacs syndrome and subsequently small-cell lung cancer. Plasmapheresis and treatment of small-cell lung cancer produced signficant symptoms improvement. We also conduct a complete review of the published case reports and case series of Isaacs syndrome of paraneoplastic etiology, which usually has good response to carbamazepine and to specfic treatment of underlying neoplasm.
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