Baló's concentric sclerosis successfully treated with alemtuzumab: Long-term follow-up.

Baló's concentric sclerosis (BCS) is regarded as a rare variant of multiple sclerosis (MS), characterised by multi-layered ring-like lesions in cerebral white matter. Despite pathological overlap with MS, the effect of treatment with MS disease-modifying therapies remains unclear. The only extant case report of alemtuzumab in BCS described a lack of clinical response in a patient who had previously not responded to corticosteroids, plasmapheresis and cyclophosphamide. The authors speculated that alemtuzumab may have been effective if started earlier in the disease process. We present the outcomes of a patient with BCS who responded clinically and radiologically to alemtuzumab over a 6-year follow-up.