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An M.R.I. showed nothing, except some other things, which had nothing to do with concussions or my symptoms, and which I’d probably have preferred not to know about: White matter intensity is generally preserved, however a solitary probable chronic lacunar infarction is present in the right caudate head, and trace probable microangiopathy is present in the parietal region on the left.

At the time, analysts cited adverse events in Roche's studies including thrombotic microangiopathy -- damage to blood vessels in vital organs -- that accompanied repeated high doses of bypassing agents given to counter bleeds that occurred despite emicizumab treatment.