9891/3 FAB M5



Definitions

Tumours of haematopoietic and lymphoid tissues
ICD-O-3 topography code: C42 and C77
ICD10: C93.0
           

/span>cute monoblastic leukaemia and acute monocytic leukaemia are myeloid leukaemias in which 80% or more of the leukaemic cells are of monocytic lineage including monoblasts, promonocytes and monocytes; a minor neutrophil component, <20%, may be present. Acute monoblastic leukaemia and acute monocytic leukaemia are distinguished by the relative proportions of monoblasts and promonocytes. In acute monoblastic leukaemia, the majority of the monocytic cells are monoblasts (typically ≥80%). In acute monocytic leukaemia, the majority of the monocytic cells are promonocytes.

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