Coexistence of primary diffuse large B-cell lymphoma and papillary thyroid carcinoma in a patient with Hashimoto's thyroiditis: A case report.

This article presents a rare case of a patient with Hashimoto's thyroiditis (HT) complicated by primary diffuse large B-cell lymphoma (DLBCL) and papillary thyroid carcinoma (PTC). The patient was admitted to the Department of Thyroid Surgery at the Second Hospital of Lanzhou University. After a total thyroidectomy, the patient recovered well and was discharged. No significant abnormalities were observed during a 2-year follow-up. The coexistence of primary DLBCL of the thyroid with HT is uncommon, and the concurrent presence of PTC is exceptionally rare. Only one similar case was found in the reviewed literature. This article reports this unique case and highlights the diagnostic efficacy of ultrasound in such conditions.