Table 4.

Diffuse large B-cell lymphomas (DLBCL) with terminally differentiated B-cell phenotype

Plasmablastic lymphomas (PBL)

Plasmablastic lymphoma of oral mucosa type

Plasmablastic lymphoma with plasmacytic differentiation

HHV-8-associated lymphomas

Plasmablastic lymphoma associated with multicentric Castleman's disease*

Primary effusion lymphoma (PEL)

Extracavitary variant of PEL

Extramedullary plasmablastic tumours secondary to plasma cell neoplasms

Diffuse large B-cell lymphoma expressing ALK

Differential diagnosis*

Diffuse large B-cell lymphoma with secretory differentiation

Pyothorax-associated lymphoma

^*These tumours express strong CD20 and therefore are probably better designated as immunoblastic variants of diffuse large B-cell lymphoma.