Table 1.

Ann Arbor classification for Hodgkin’s lymphoma.

Stage	Explanation
I	Involvement of one lymph node region or a single localized involvement outside the lymphatic system
II	Involvement of two or more lymph node regions on the same side of the diaphragm or localized involvement outside the lymphatic system and lymph node regions on the same side of the diaphragm
III	Involvement of two or more lymph node regions or organs outside the lymphatic system on both sides of the diaphragm
IV	Diffuse or disseminated infestation of one or more extralymphatic organs with or without infestation of lymphoid tissue
A	No B-symptoms
B	B symptoms: fever, drenching night sweats, and/or unexplained loss of body weight >10% within the preceding 6 months.