If it is just one side it still may be lymphoma but is more likely to be an infection. Think about when people gets mumps on one side, how the nodes on one side enflame, or when a person gets an injury on one side that gets infected and the same thing happens. So, your vet may choose to at first try at least ten days of a strong broad-spectrum antibiotic like Clavamox to see what happens since infection can also blow up nodes. I'm not sure that the strain of travel is the best choice at this point if you have to option of one of the vet techs at the hospital coming over to check the ferret, take care, and get in meds, so hopefully that option exists. We love hiring vet techs as pet sitters. It works wonderfully well. To learn more about lymphoma see the FHL Archives (URL in my sig lines) and read <http://www.afip.org/consultation/vetpath/ferrets/PDF/Lymphoma_Ferrets.pdf> Sukie (not a vet) Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/fhc/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html [Posted in FML 6134]