Abstract
Sir, Progressive multifocal leucoencephalopathy (PML) is a rare but usually fatal demyelinating disease of the brain caused by JC papovavirus (JCV). At least 50–75% of the adult population are seropositive for JCV. When JCV reactivation occurs, focal plaques develop in central nervous system white matter. Viral proliferation causes lysis of oligodendrocytes and therefore rapid demyelination [1]. Rituximab is a relatively novel therapy for systemic lupus erythematosus (SLE) and PML has not previously been reported in a patient with SLE treated with rituximab.

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