Malignant lymphoma of the thyroid gland

: During the past 14 years, 14 cases involving a malignant lymphoma of the thyroid have been treated at our department. These cases have been histologically reviewed and reclassified, according to the Working Formulation. Four cases involved a low grade malignancy (LGM), 9 cases an intermediate malignancy (IGM), and 4 cases a high grade malignancy (HGM). Thirteen lymphomas were of the B-cell type, and the remaining lymphoma was of the T-cell type. The coexistence of a chronic thyroiditis was noted in 9 cases. Survivors were only found in the LGM and IGM groups. We consider it necessary to treat malignant lymphomas of the thyroid according to the subtype of the Working Formulation.