Case Presentation: A 17 y.o. female with systemic lupus erythematosus (SLE) presented with several weeks of worsening migratory polyarthralgia, as well as sporadic fevers, night sweats, and chills. Prednisone was begun 3 weeks prior for a presumed SLE flare, given elevated anti double-stranded DNA (anti-dsDNA) and erythrocyte sedimentation rate (ESR) and hematuria, but provided no [...]