ocr: Stage Description Involvement of a single lymph node region or a lymphoid structure (e.g., spleen, thymus, Waldeyer's ring) or involvement of a single extralymphatic site (IE) II Involvement of two or more lymph node regions on the same side of the diaphragm (hilar nodes, when involved on both sides, constitute stage II disease); localized contiguous involvement of only one extra- nodal organ or site and lymph node region on the same side of the diaphragm (IIE). The number of anatomic sites should be indicated by a subscript (e.g., IIs) III Involvement of lymph node regions on both sides of th ...
