ADAMTS13 and thrombotic thrombocytopenic purpura: We documented many cases of patients at our hospital who experienced TMA after severe trauma, and their clinical courses were similar to those of patients with thrombotic thrombocytopenic purpura (TTP), as a disintegrin and metalloproteinase with thrombospondin motifs 13 (ADAMTS13)-deficiency-mediated TMA.