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Morphological features of aggressive mature B cell lymphomas. In DLBCL, the cells are pleomorphic with centroblastic and/or immunoblastic features. Blastoid cells are medium-sized cells with a fine chromatin pattern and inconspicuous nucleoli. Cases with features overlapping between BL and DLBCL (BCLU) show medium-sized cells, less monomorphic than in classical BL, with multiple paracentrally located nucleoli and frequent starry sky pattern
