lymphoma staging

lymphoma staging,

a system for classifying lymphomas according to the extent of the disease for the purpose of treatment and prognosis. Stage I is characterized by the involvement of a single lymph node region or one extralymphatic organ or site. Stage II is characterized by the involvement of two or more lymph node regions on the same side of the diaphragm or a localized involvement of an extralymphatic organ or site plus one or more node regions on the same side of the diaphragm. In stage III, lymph nodes on both sides of the diaphragm are affected, and there may be involvement of the spleen or localized involvement of an extralymphatic organ or site. Stage IV is typified by diffuse or disseminated involvement of one or more extralymphatic organs or sites with or without associated lymph node involvement.