A 65 year-old female visited because of neck mass. Tumors were found in thyroid, neck nodes, lung parenchyma, liver, kidney and bone. Biopsy of neck node revealed malignant lymphoma (diffuse large B cell lineage) and metastatic papillary thyroid carcinoma simultaneously. Her thyroid function was normal. She was treated with chemotherapy targeting malignant lymphoma initially, and achieved near complete remission. Additional biopsy of neck node after first chemotherapy revealed no papillary carcinoma. To our knowledge, this is the first report of malignant lymphoma and papillary carcinoma simultaneously involving thyroid gland in Korea.

Keywords: Papillary thyroid carcinoma, Malignant lymphoma, Coexistence, Simultaneous