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What is ALL L3 morphology is a malignancy arising from which cell lineage – and explain in detail?
Cellular classification of ALL 
French-American-British (FAB) system divides ALL into three morphological subtypes.
i) LI lymphoblasts

Most common type (80-85%)
Cells have scanty cytoplasm and inconspicuous nucleoli.
Have better prognosis

ii) L2 lymphoblasts

Cells are large and more pleomorphic in size with more abundant cytoplasm and prominent nucleoli.

iii) L3 - lymphoblast

Least common
Morphology is identical to urkitt's lymphoma cells i.e., mature B cells with surface immunoglobulin positive.