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Pathology
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:
No surface antigens (null phenotype)
An immature T cell phenotype (Tdt/D34/CD7 positive)
Myeloid markers, such as CD13, CD33 and CD15
B cell markers, such as CD19, CD20 and CD22
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