LAS VEGAS – If Josiah Harrell had gone through with competing at UFC 290 , the result could’ve been deadly. While that’s a risk for every fighter who steps in the cage given the brutal nature of mixed martial arts, it would’ve been especially so for Harrell. That’s because Harrell has Moyamoya disease, a serious blood vessel disorder in the skull that can cause clotting at the base of the brain. The only reason Harrell was diagnosed with the rare condition is because of a pre-fight MRA test administered by the UFC, which caused his promotional debut against Jack Della Maddalena to be canceled
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