I think that, on the basis of displayed pictures, one can consider the differential diagnosis between HL and peripheral T-cell lymphoma, which sometimes can have large CD15/CD30+ cells. For this distinction, in my opinion it is important morphology (clear evidence of R-S cells) and immunohistochemistry (large cells should be LCA-/Cd30+ for HL diagnosis). I am slightly in favour of the diagnosis of HL.

Thanx. But EMA+ CD30- (definitelly) and superstrong and expanded CD20+ population? Maybe DLBCL diagnosis is not so extreme in this case? LCA interpretation is still difficult, but there is positive rim (by my eys) in photo- added additionally.

A bit of a dilemma. I am surprized that the large cells do not express CD30. Are you sure? Overall, this case resembles cases that have been described as "Large B-cell lymphoma with Hodgkin's features" by Garcia et al in Histopathology (2005 Jul;47(1):101-10)or as T cell rich B cell lymphoma (TCRBCL) by others but with an important difference: your case shows CD15 positivity which is highly unusual in cases of TCRBCL. I cannot tell on the pics. whether the CD15 positive cells correspond to the CD20 positive one or maybe are histiocytes?  
 
To complete the work-up, I would probably add Alk-1 and EBV. Clinically: is this patient immunocompetent?  
 
In conclusion based on what I have seen so far (and lacking molecular analysis -- IgH chain gene and TCR rearrangement analysis is really mandatory in cases of gray zone lymphomas)I would favor an uncommon (i.e. CD15 pos.) variant of TCRBCL.

Thank you, CD15+CD30-CD20+EMA+ cells are CLEARLY atypical. I may append CD30 reaction- it usually works more effective then CD15 usually in our lab (for instance in HL). So it looks surprisingly for sure. But we would like <10% large cells for qualifying T/H reach DLBCL. In this case CD20+ large cell population is more prominent.  
One more comment: we have had a meeting today with collegues from Baltic countries(Estonia and Latvia). SURPRISINGLY incidence of FOLLICULAR lymphoma in our area (in all 3 countries) is more rare event and incidence of DLBCL more dominating, than in Western countries...And immunophenotypes of DLBCL are often mixed of activated. GC type DLBCL are rare enouh- maybe one case is presented before (tumor in cervix uteri). Have you any wxplanation of this phenomena? I was afraid about diagnostic problems, but if so- it's identical to 3 different countries:)

I am very happy with Attilios suggestion of TCRBCL. The clear CD15+ cannot be explained. Regarding HL, there are too many arguments against this diagnosis.