Hi, my 25 year old son received chemotherapy from 12/2014 through 6/2015 for non-hodgkins lymphoma, and obtained successful remission. PET scans from 6/2015 through recently have confirmed his remission is stable. But, a PEt scan today revealed 3 (cm? mm??) swelling of lymph nodes in his neck. His oncologist doesn t seem too concerned, and we plan to have his chest port surgically removed later this month. Is the 3 cm swelling generally anything to worry about? He shows no signs of any other cold, URI, infection, etc. Thank you.