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Any of a group of malignant diseases (seecancer) that usually start in the lymph nodes or lymphoid tissues. The two major types, Hodgkin disease and non-Hodgkin lymphoma, each have several subtypes. Diagnosis of either type requires biopsy, usually from the lymph nodes. Non-Hodgkin lymphomas may be diffuse (widespread) or nodular (concentrated in nodules); nodular lymphomas generally develop more slowly.
This entry comes from Encyclopædia Britannica Concise. For the full entry on lymphoma, visit Britannica.com.