T lymphoblastic leukaemia (T-ALL) is a neoplasm of lymphoblasts committed to T-cell lineage and TALL is diagnosed by identification of immaturity markers and the lineage specific Cluster of Differentiation (CD) marker, CD3 in the leukemic cells. Here we report a 20 year old male who was diagnosed as case of TALL , whose leukemic blasts on morphology resembled the lymphoid cells seen in hairy cell leukemia (HCL) resulting in a diagnostic dilemma which was resolved subsequently by immunophenotyping. Even though the presence of cells with hairy projections is rarely reported in haematological malignancies other than HCL, ours is a first of its kind in TALL.
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