De novo DLBCL | DLBCL with no underlying indolent lymphoma |
Transformed DLBCL | DLBCL with a history of antecedent indolent lymphoma |
Composite DLBCL | DLBCL with indolent lymphoma in the same anatomic location |
Discordant DLBCL | DLBCL with indolent lymphoma in a separate anatomic location |