“…Only a handful of reports on Hodgkin's lymphoma (HL) manifesting as a variant of RS, originally described by Richter (1928) and called ‘reticular cell sarcoma’, have been published, particularly in patients treated with purine analogues (Choi & Keller, 1981; Brecher & Banks, 1990; Shin et al , 1993; Rubin et al , 1994; Butts et al , 1995; Weisenberg et al , 1995; Fayad et al , 1996; Juneja et al , 1999; Kanzler et al , 2000; Adiga et al , 2003; Nemets et al , 2003). The frequency of CLL transformation into HL varies between 0.5% and 2.3% (Fayad et al , 1996; Keating et al , 1998).…”