Congenital amegakaryocytic thrombocytopenia (CAMT) is a rare disease characterized by a severe hypomegakaryocytic thrombocytopenia (absence of megakaryocytes in the bone marrow) during the first years of life that develops into a pancytopenia in later childhood, suggesting a general defect in hematopoiesis. Because of the severity of this disease, it is usually recognized shortly after birth. Currently, patients with congenital amegakaryocytic thrombocytopenia can only be cured by bone marrow transplantation.