Autoptic findings of a 77-year-old man with T-cell-rich B-cell lymphoma (TCRBCL)showed predominant infiltration of reactive T-cells with a minority population ofneoplastic B-cells in liver, spleen, pancreas, adrenal gland, stomach, small intestine and heart, as well as, lymph node. DNA studies demonstrated dual rearrangement in the T-cell receptor beta (TCRB), immunoglobulin heavy chain J region (IgJH) and kappa light chain J region (IgjK) genes. (Internal Medicine 34: 243-246, 1995)