Table 1

Staging of Lymphoma: Ann Arbor classification

Stage I Disease in a single lymph node region
Stage II Disease in two or more regions on the same side of the diaphragm
Stage III Disease in lymph node regions on both sides of the diaphragm
Stage IV Diffuse or disseminated involvement of one or more extralymphatic organs or tissues with or without associated lymph node enlargement.

Langley et al. World Journal of Surgical Oncology 2008 6:34   doi:10.1186/1477-7819-6-34