Occult Thyroid Carcinoma Presenting as Metastatic Parotid Tumor.

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We report a rare case of occult thyroid carcinoma which was found from metastatic parotid tumor. This is the 6th case of thyroid carcinoma presenting as metastatic parotid tumor to be reported in the literature.A 62-year-old man had complained of left parotid tumor for 4 months. Left total parotidectomy and left neck dissection were performed, and a frozen section of the tumor was diagnosed histopathologically as adenocarcinoma. After the surgery, metastatic papillary carcinoma was found in neck lymph nodes by further pathological examination. Total thyroidectomy was then performed, and the primary tumor, 8mm in diameter, was found in the left lobe of the thyroid. The parotid tumor was diagnosed as metastasis of poorly differentiated thyroid carcinoma by histopathological findings and immunopathological examination using monoclonal antibody (TCM9) specific to the thyroid carcinoma.It was concluded that the original tumor was the differentiated papillary carcinoma of the thyroid, and that cells of the tumor were transformed to poorly differentiated carcinoma in the neck lymph node and some of those cells metastasized to the parotid gland.
耳鼻咽喉科臨床学会の論文