Congenital autosomal recessive sideroblastic anemia (ARSA) is a non-syndromic, microcytic/hypochromic sideroblastic anemia, present from early infancy and characterized by severe microcytic anemia, which is not pyridoxine responsive, and increased serum ferritin. The disease is autosomal recessive sideroblastic anemia (MONDO_0016828). Also known as: ARSA, sideroblastic anemia, autosomal recessive.