III

Definition of stage III adult non-Hodgkin lymphoma
National Cancer Institute

stage III adult non-Hodgkin lymphoma

(... uh-dult non-HOJ-kin lim-FOH-muh)
Cancer is found (1) in groups of lymph nodes both above and below the diaphragm; or (2) in lymph nodes above the diaphragm and in the spleen.

Source: NCI Dictionary of Cancer Terms