TABLE 33.13.

Subtypes of Leukemias and Dysplasias Adapting the FAB System

Subtype	Description
Acute Leukemias
AUL	Acute undifferentiated leukemia (formerly called reticuloendotheliosis)
M1	Myeloblastic leukemia, without differentiation
M2	Myeloblastic leukemia, with some neutrophilic differentiation
M3	Promyelocytic leukemia (not recognized in animals)
M4	Myelomonocytic leukemia
M5a	Monocytic leukemia, without differentiation
M5b	Monocytic leukemia, with some monocytic differentiation
M6	Erythroleukemia
M6Er	Variant of M6 with erythroblasts comprising erythroid component
M7	Megakaryoblastic leukemia
Chronic Myeloid Leukemias

CML	Chronic myelogenous leukemia
CMML	Chronic myelomonocytic leukemia
CMoL	Chronic monocytic leukemia
Hematopoietic Dysplasia

MDS	Myelodysplastic syndrome
MDS-Er	Myelodysplastic syndrome with erythroid predominance