We report a variant, ider(21)(q10)t(12:21)(p12;q22), which was shown to contain double ETV6/CBFA2 fusions by fluorescence in situ hybridization.     ///    Childhood acute lymphoblastic leukaemia with ider(21)(q10)t(12;21)(p12;q22): a new recurrent abnormality showing ETV6/CBFA2 fusion..     ///    " The cytogenetically unidentifiable t(12;21)(p12:q22), resulting in ETV6/CBFA2 fusion, is the most frequent chromosomal aberration in childhood acute lymphoblastic leukaemia ALL). "    ///    "pre-B-cell ALL and age 1-10 years, we suggest that all ALL displaying these changes should be tested for ETV6/CBFA2 fusion transcript.. "