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By Mayo Clinic staffCastleman disease is a rare illness that affects your lymph nodes and other immune-cell structures of your body.
Also known as giant lymph node hyperplasia and angiofollicular lymph node hyperplasia, Castleman disease is classified as a lymphoproliferative disorder. That means it involves a proliferation, or overgrowth, of lymphatic cells. This makes Castleman disease similar to cancers of the lymphatic system (lymphomas), which also are characterized by cell overgrowth. Castleman disease isn't considered a cancer, however.
Castleman disease can occur in a localized or a more widespread form. Treatment and outlook depend on which type of Castleman disease you have.
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