https://bmcneurol.biomedcentral.com/...883-018-1232-z

Very nice summary of the onset and clinical progression of SPS, published in 2019, of a large (for this disease at least; Its so rare that itís hard to find a very large subject pool to study prospectively or retrospectively).

Interesting comment about Rituxan: largely ineffective except in a small number of patients for which rituxan is a miracle drug.