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Photomicrographs of the tumor specimen. A: H&E stain (×600). Several lymphoblasts with high nuclear/cytoplasmic ratio and variably condensed nuclear chromatin. B: Immunophenotype stain (CD10). Lymphoblast marker (CD10) was positive. C: Immunophenotype stain (TdT). Lymphoblast marker (TdT) was positive. D: Immunophenotype stain (CD79a). B-cell marker (CD79a) was positive.
