I'm putting up these links for anyone newly diagnosed or who joined since I last posted them. They are both from Medical News Today . This one gives an overview of the Lymphatic System , what it does and what can go wrong:
medicalnewstoday.com/articl...
And this one explains Lymphoma - treatment, symptoms, suspected causes etc. :
Relapsed Mantle Cell Lymphoma--I'm new here! 
large B-cell lymphoma
Advice for new lymphoma diagnosis
Follicular non Hodgkin's lymphoma
Mantle cell lymphoma Hope 