2 year old male presented with eye swelling and ptosis, pancytopenia, lymphadenopathy, hepatosplenomegaly and blasts identified on peripheral smear. CT demonstrated a 2 x 2 cm supra orbital mass, and a 5 x 5 x 4 cm well circumscribed heterogeneous low density abdominal mass.
Bone marrow aspirate smears show:
BM biopsy sections show: