Stage

Definition

I

A single tumor, excluding mediastinum and abdomen

II

A single, extranodal tumor with regional node involvement, 2 or more nodal areas on the same side of the diaphragm, or a completely resectable primary gastrointestinal tract tumor, with or without associated mesenteric node involvement

III

2 or more extranodal tumors above and/or below the diaphragm, 2 or more nodal areas above and below the diaphragm, intra-abdominal and retroperitoneal disease, including liver, spleen, kidney, and /or ovary localizations, regardless of degree of resection, with or without involving associated mesenteric nodes that are completely resectable, any paraspinal or epidural tumor, and a single bone lesion with concomitant involvement of extranodal or nonregional nodal sites

IV

Any of the stage I to III characteristics with initial involvement of the central nervous system, bone marrow, or both