What is low grade lymphoma and is it treated with chemo?

Many types... Lymphoma consists of >50 subtypes. Lymphoma can be divided/dichotomized into groups such as: 1) hodgkin lymphoma (hl)/non-hl (nhl), 2) t-/b-cell, 3) agressive/indolent. There are other divisions, but that is a start. "low grade" or indolent lymphomas can be multiple subtypes. The most common is follicular lymphoma. Treatment options range from "active observation" to Rituximab to chemo to sct.