Stage I: Single nodal or extranodal site excluding mediastinum or abdomen Stage II: Single extranodal tumor with regional nodal involvement Two extranodal tumors on one side of diaphragm Primary gastrointestinal tumor with or without associated mesenteric nodes Two or more nodal areas on one side of diaphragm Stage IIR: Completely resected intra-abdominal disease Stage III: Two single extranodal tumors on opposite sides of diaphragm All primary intrathoracic tumors All paraspinal or epidural tumors All extensive primary intra-abdominal disease Two or more nodal areas on opposite sides of diaphragm Stage IIIA: Localized, nonresectable abdominal disease Stage IIIB: Widespread multiorgan abdominal disease Stage IV: Initial central nervous system or marrow involvement (< 25%) |