{Reference Type}: Case Reports {Title}: Lymphoma and Differentiated Thyroid Cancer: A Case Series. {Author}: Sherief A;Thambi SM;Susan Joy Philip D;Menon A;A S; {Journal}: Cureus {Volume}: 15 {Issue}: 1 {Year}: Jan 2023 暂无{DOI}: 10.7759/cureus.34429 {Abstract}: Occurrences of lymphoma and differentiated thyroid cancer are rare. Usually, involvement of the thyroid gland is seen as a part of extranodal involvement or as a part of radiation-induced malignant transformation in previously treated lymphoma patients. The incidence of synchronous hematological malignancy with differentiated thyroid cancer is 7%. The synchronous occurrence of differentiated thyroid cancer and lymphoma poses a significant diagnostic and treatment dilemma. Here we report a case series of four patients with lymphoma and differentiated thyroid cancer. All four patients had lymphoma treated first followed by definitive management of thyroid malignancy.