A 17 year old boy presented with total count of 138 x 109 /L with 80% blasts on the peripheral smear. Chest X-ray demonstrated a large mediastinal mass. Immunophenotyping of this patient's blasts would most likely demonstrate:

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An immature T cell phenotype (Tdt/D34/CD7 positive)

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No surface antigens (null phenotype)

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Myeloid markers, such as CD13, CD33 and CD15

A 17 year old boy presented with total count of 138 x 109 /L with 80% blasts on the peripheral smear. Chest X-ray demonstrated a large mediastinal mass. Immunophenotyping of this patient’s blasts would most likely demonstrate:

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