FAB Classification of ALL
Definitions:
L1:
FAB:
French-American-British
Smaller blasts
Flat, round or oval
nuclei
Homogeneous chromatin
Nucleoli may not be
visible
L2:
Large blasts
More irregular shaped
nuclei
Nucleoli may be
visible (>1)
L3:
Large blasts
Resembles malignant
lymphocytes of Burkitt’s lymphoma
