A distinct form of acute myeloid leukaemia in which this chromosomal anomaly is found de novo or in therapy-related cases. The disease is characterised by frequent extramedullary involvement (mainly hepatomegaly, splenomegaly, lymphadenopathies, cutaneous infiltration, but also gum, bone, central nervous system, testicles involvement), severe coagulation disorder (disseminated intravascular coagulopathy or primary fibrinolysis) and poor prognosis. Morphologically, a blast population with a myelomonocytic stage of differentiation is observed. [from SNOMEDCT_US]