Immune-reconstitution Inflammatory Syndrome in Multiple Sclerosis Patients Treated With Natalizumab: A Series of 4 Cases.

Purpose: Natalizumab (NTZ) is an effective treatment for relapsing-remitting multiple sclerosis (RRMS). Progressive multifocal leukoencephalopathy (PML) is a rare complication of NTZ treatment. In patients developing PML, NTZ cessation causes a reconstruction of cellular immunity, a rapid transition of cells through the blood-brain barrier, and significant inflammation in the central nervous system, leading to immune-reconstitution inflammatory syndrome (IRIS), with potentially poor outcomes.

Reversible splenial lesion in auto-immune thyroid disease: a case report.

Reversible lesions of the splenium of the corpus callosum constitute a clinicoradiological syndrome that has been associated to various medical conditions. We report the case of a 47-year-old man who presented with encephalopathy associated to auto-immune thyroid disease in which a reversible splenial lesion was isolated. Although encephalopathy associated to auto-immune thyroid disease is characterized by variable radiological findings, it has only been once associated with a reversible splenial lesion.