A diffuse large B-cell lymphoma primarily involving the thyroid gland. The disease is thyroid gland diffuse large B-cell lymphoma (MONDO_0006462). Also known as: diffuse large B-cell lymphoma of the thyroid, diffuse large B-cell lymphoma of the thyroid gland, diffuse large B-cell lymphoma of thyroid, diffuse large B-cell lymphoma of thyroid gland, primary thyroid gland diffuse large B-cell lymphoma, thyroid diffuse large B-cell lymphoma.