Abstract 1. 1. Primary lymphoma of the thyroid in the literature (165 cases) has been reviewed and 9 additional cases presented. 2. 2. The prognosis, though guarded, may be more favorable than heretofore quoted. 3. 3. Hashimoto's disease is infrequently associated with primary lymphoma of the thyroid gland; only 35 such cases have been reported in the literature. 4. 4. The choice of therapy is based upon whether the disease is localized, invasive, or disseminated.