AML with maturation

At least 20% blasts in blood or bone marrow with or without azurophilic granulation, often Auer rods are seen. At least 10% matured myelopoiesis is present in the bone marrow (promyelocytes – neutrophils). Nucleoli are less visible.
Flow cytometry: CD13, CD33, MPO and CD15 are positive, CD34 and CD117 are often positive in at least a fraction of the blasts.