B-cell lymphoblastic lymphoma (B-LBL) is a rare neoplasm 1 characterized by the proliferation of B-lymphoblasts in lymph nodes or extranodal sites (e.g., skin, bone, or soft tissue). 2 It differs from B-cell acute lymphoblastic leukemia (B-ALL) by the absence of significant bone marrow (BM) infiltration. The World Health Organization classification of myeloid neoplasms and acute leukemia defines a subgroup 3 of B-lymphoblastic leukemia/lymphoma with t(9;22)(q34.1;q11.2), which can be targeted by tyrosine kinase inhibitors (TKIs) such as imatinib or dasatinib. 4 Unlike B-ALL, BCR::ABL1 + B-LBL are rarely reported in publications.A 10-year-old male was referred to our pediatric hospital for swelling of the right jaw. The child was in good general condition with no other symptoms. His medical history was unremarkable, and there was no relevant familial history. Clinical examination revealed a mass localized at the angle of the right jaw. Palpation of the liver, spleen, and superficial lymph nodes did not reveal any abnormalities. Neurological examination was normal.