“…1,4,10,30 An interesting and more etiologically challenging transformation is HD terminally complicating CLL. Although several reports of this were published in the 1940-1970's, 7,13,[17][18][19]27,29,31 some authors refuted the diagnosis as misinterpretation of diffuse histiocytic lymphoma with "Reed-Sternberg-like" cells. 11,20 In recent years, with modern diagnostic tools of immunohistochemistry, flow cytometry and molecular genetics, several further reports of this phenomenon have been confirmed.…”