Hi Ugnius,  
This is an obviously blastic, nodular growing B-cell lymphoma with disrupted FDC networks and a rather unspecific phenotype. There are some arguments for FL G3b, but the tumor rather disrupts and pushes the FDC aside. A blast-rich MZL is a good idea as well, but I do not see a typical MZL pattern. Finally, and from the practical point of view, most importantly the morphology, the proliferation and the clinical presentation best fit to a DLBCL with a nodular pattern. I think that such a designation will straight forward lead to the only adequate therapeutical decision for the clinical colleagues as well. I have seen at least two cases of full blown DLBCL in one lymph node showing a similar pattern of "early", nodular involvement in adjacent lymph nodes, so that I speculate that such an "early" involvement might explain what you see. I am curious if the patient has a low stage (II) disease?  

Thank you a lot. Up to date a patient comes for therapy, so maybe additional data wil be cleared up. It seems to be low stage and good performance. Another idea was not stated as possibility: just FL in transformation with the same meaning of DLBCL... Admixture of cc like cells slightly blurr the clear cut pattern of disease.

Since CD10 and LMO2 are negative I would rather consider FL not as diagnosis of first choice.