under reserve of the thikness of the slides, the poor focus of the figures and tha lacking scanning magnification, one can identify a mixture of small lymphoid elemnts, particulalry in sinuses, intermingled with delicate fibrous bands, vessels and "pink" histiocytes. in LN1 a reactive follicle is seen on the right and the one in LN4 has some reminiscense of Castleman onion-skin lesion. considering the morphology, the differential is broad, ranging from unspecific reactive process, through early Castleman to mantle cell lymphoma (particularly the latter should be excluded by immuno - CD20, CD5, CD23, Cyclin D1), naturally, considering the age of the patient, the latter seems also the most unprobable... to sumarize I would favor a reactive process, but particularly mantle cell lymphoma should be ruled out.

Most of the images look like paracortical hyperplasia with all usual features: polimorfism, histiocytes, vascularisation. Lymphocte-filled sinuses could indicate viral process.  
 
It is difficult to appreciate follicules: one is hyperplastic, one Castleman-like. If there is a significant follicular hyperplasia in this node, I think a reactive process is most probable.

I agree that it is likely a reactive process. Of the views submitted, the low-power ones are the most helpful.