ABL1 and acute lymphoblastic leukemia: In addition, an abnormal FISH pattern previously described as the deletion of the 3'BCR region in some BCR/ABL1 positive cases was not proved in our patient.<h4>Conclusion</h4>A novel case of extremely rare childhood ALL, characterized by HeH and a cryptic BCR/ABL1 fusion, is presented and to the best of our knowledge described for the first time.