9 month old female presented with marked leukocytosis. Flow cytometry of PB showed following findings.
Cytogenetic: t(4;11)(q21;q23); FISH positive for MLL/AF4 (now called KMT2A and AFF1 respectively) fusion.
Flow cytometry study of End of induction BM:
Flow cytometry study of End of induction BM:
Flow cytometry Study of End of Consolidation BM: