CHICAGO—Diagnosing and treating IgA vasculitis—leukocytoclastic vasculitis involving deposits of IgA1 deposits on the walls of small vessels—is rife with uncertainties, outright unknowns and treatment challenges, an expert on the disease said at the ACR’s 2016 State-of-the-Art Clinical Symposium. Alexandra Villa-Forte, MD, MPH, staff physician at Cleveland Clinic’s Center for Vasculitis Care and Research, said IgA…