This fusion is predominantly detected in immature forms of acute leukemia (AL), often with a mixed T-cell (CD5, CD7) and myeloid phenotype (CD13, CD33), mostly resulting in the classification as T-ALL, AML, acute undifferentiated leukemia (AUL), AL of ambiguous lineage (ALAL) or mixed-phenotype AL (MPAL) [5, 6]. The gene discussed is CD33; the disease is axial length measurement.