Clinical Pearl from Dr. @JKolfenbach: ⭐️(-) ANCA doesn't r/o limited GPA ⭐️Biopsies can be just as important for ruling out mimics: ‣Neoplastic Dx (NK/T cell sinus lymphomas) ‣Histiocytic process ‣Infectious (fungal, mycobacteria) ‣Foreign material (cocaine) #ACR21 @RheumNow https://t.co/PEoYPBFLj0