A#1403 #ACR23 @RheumNow 17% of 1st degree relatives of AS pts have MRI-defined sacroiliitis Study of 100 subjects w FHx AS - 13/100: new dx of AxSpA, 7 w radiographic changes - 4/100: Sacroiliitis without back pain - 1 periph SpA - 12 met clinical ASAS classification but not dx https://t.co/V7LCbaDXBe