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A 17 year old boy presented with TLC of 138 x lOV I with 80% blasts on the peripheral smear. Chest X-ray deniosnstrated a large mediastinal mass. Immunophenotyplng of this patent's blasts would most likely demonstrate -
No surface antigens (null phenotype)
An immature T cell phenotype (Tdt/CD34/CD7 positve)
Myeloid markers, such as CD 13, CD33 and CD 15
B cell markers, such as CD 19, CD20 and CD22
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