Reading thru the Q&A , I am surprised that no one responded to your question. To be honest I have never seen a dx of Benign Lymphoma. Wonder if they used the benign inter-changably with indolent? Yet, when I did an internet search - there it was:

"Benign lymphoma, also referred to as a pseudolymphoma or as a benign lymphoid hyperplasia (BLH), is a rare non-cancerous (benign) tumor made up of lymphocytes. Lymphocyes or white blood cells are part of the body’s immune system and help defend our body against infection.?"

I honestly have no idea how to answer your question. I wonder a bit about your weight changes, as unexplained significant weight loss seems to be one of those general symptoms for many types of CA. I hope that you discussed the weight issue with your Dr(s), plus any other symptoms that you may have noticed but considered to common/minor to mention. Good Luck.