Table 1: Staging system for extranodal lymphomas. Modified Ann Arbor classification.

StageDescription

IEInvolvement of a single lymph node region or a single organ.

IIEInvolvement of a single extralymphatic organ or site and one or more regional lymph nodes ipsilateral to diaphragm.

IIEInvolvement of a single extralymphatic organ or site and regional lymph nodes on both sides of the diaphragm.

IVEDiffuse involvement or dissemination of one or more extralymphatic sites, with or without the involvement of lymphatic nodes.