The final diagnosis included 19 diffuse large/high‐grade BCLs with MYC and BCL2 rearrangements (five with DLBCL morphology including one with an additional BCL6 rearrangement and 14 with HGBCL morphology including one with an additional BCL6 rearrangement), three DLBCL‐NOS, three HGBCL‐NOS, four B‐ALL/LBLs, and two cases unclassifiable due to equal evidence for both an immature (strong TdT expression with partial loss of both CD20 and CD79a expression) and a mature (expression of both BCL6 and MUM1 together with no CD34 expression) immunophenotype (Table 1 and Figure 1). Here, DNTT is linked to acute lymphoblastic leukemia.