Variable expression of B-cell transcription factors in reactive immunoblastic proliferations: a potential mimic of classical Hodgkin lymphoma.

Reactive immunoblastic proliferations can histologically mimic classical Hodgkin lymphoma (CHL), and show diffuse CD30 expression in large cells. The lack of expression of CD15 in a subset of CHL further complicates their separation from immunoblastic proliferations. Loss of expression of B-cell tra