IGHA1 and Henoch-Schoenlein purpura: IgA vasculitis (IgAV), also known as Henoch-Schönlein purpura, is a systemic vasculitis characterised by IgA1-dominant immune complex deposition [1], often presenting with a classic tetrad of palpable purpura, arthralgia, abdominal pain, and renal involvement [2].