#ACR18 Late Breaking: #L15 Anthony Sammel - PET/CT vs TAB for suspected GCA. PET 92% sens, 85% spec. (NB 3/7 false+ were clinically diagnosed with GCA). NPV 98%. Kappa 0.65. Including 4 vessels improves PET performance. Great data, GCA Dx remains a difficult art. @RheumNow https://t.co/eAA3QNYBfd