Acquired thrombotic thrombocytopenic purpura in a child: rituximab to prevent relapse. A pediatric report and literature review.

Thrombotic thrombocytopenic purpura (TTP) is a life-threatening thrombotic microangiopathy (TMA), characterized by peripheral thrombocytopenia, microangiopathic hemolytic anemia (MAHA) and severe deficiency of a disintegrin and metalloproteinase with trombospondin type 1 motif, member 13 (ADAMTS13