Working Formulation [3]	Rappaport Classification
Low grade
A. Small lymphocytic, consistent with chronic lymphocytic leukemia	Diffuse lymphocytic, well-differentiated
B. Follicular, predominantly small-cleaved cell	Nodular lymphocytic, poorly differentiated
C. Follicular, mixed small-cleaved, and large cell	Nodular mixed, lymphocytic, and histiocytic
Intermediate grade
D. Follicular, predominantly large cell	Nodular histiocytic
E. Diffuse, small-cleaved cell	Diffuse lymphocytic, poorly differentiated
F. Diffuse mixed, small and large cell	Diffuse mixed, lymphocytic, and histiocytic
G. Diffuse, large cell, cleaved, or noncleaved cell	Diffuse histiocytic
High grade
H. Immunoblastic, large cell	Diffuse histiocytic
I. Lymphoblastic, convoluted, or nonconvoluted cell	Diffuse lymphoblastic
J. Small noncleaved-cell, Burkitt, or non-Burkitt	Diffuse undifferentiated Burkitt or non-Burkitt

References

3. National Cancer Institute sponsored study of classifications of non-Hodgkin's lymphomas: summary and description of a working formulation for clinical usage. The Non-Hodgkin's Lymphoma Pathologic Classification Project. Cancer 49 (10): 2112-35, 1982.  [PUBMED Abstract]