Transformations in diffuse large B-cell lymphoma (DLBCL) are extremely rare. Here, we are presenting a very rare case of DLBCL transforming into lymphoblastic lymphoma (LBL) diagnosed by fine-needle aspiration cytology (FNAC) and flow cytometry. A 31-year old male on antiretroviral therapy and a known case of diffuse large B-cell lymphoma diagnosed 1 year back on cervical lymphadenopathy, presented with left axillary swelling for 3 months. FNAC and Flow cytometry were performed from the left axillary swelling which confirmed the diagnosis of LBL.
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