“…However, with the wider use of IvIg in the treatment of autoimmune disorders, severe side‐effects have also been reported to occur in IvIg‐treated patients, especially acute renal tubular necrosis, aseptic meningitis, anaphylaxis in patients with IgA deficiencies and IgA antibodies, and thrombotic manifestations 3,6–9,13–18 . In limited neurological series, the incidence of thrombotic complications has indeed been estimated to be as high as 1·1–4·5% in patients receiving IvIg 3–9,12,13,16,17,19–47 …”