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Follicular lymphoma of the thyroid gland with features Bcl-2 expression/IGH-BCL2. Most of these lymphomas were composed of neoplastic follicles of WHO grade 1 or 2 (A, case 13). Germinal centre cells typically expressed Bcl-2 (B), Bcl-6 (C) and CD10 (D) (all case 17). As evident in panels C and D, in many cases there was downregulation of Bcl-6 and CD10 expression in the extrafollicular lymphoma cells.
