Thyroid and parotid tumors are commonly encountered by head and neck surgeons, however, it is relatively rare for these tumors to reach giant sizes. There have been no reports of simultaneous treatment of giant thyroid tumors and giant parotid tumors. We report simultaneous resection of a giant thyroid tumor and giant parotid tumor in a 62-year-old woman who had presented with an indolent swelling in the anterior cervical region 10 years earlier, and another in the left parotid region 2 years earlier. In the present medical history, she visited our department due to bleeding from the left parotid tumor. The giant tumor in the anterior neck measured 108 cm in size and was elastic in consistency, and the giant parotid tumor measured 98 cm in size, with skin infiltration. The cytological findings of preoperative fine needle aspiration cytology from the thyroid tumor and parotid tumor were classified as class I and class III, respectively. We performed simultaneous resection of both tumors. There were no surgical complications, such as recurrent nerve paraly or facial nerve palsy. Histopathological examination of the thyroid tumor revealed follicular adenoma, while that of the parotid tumor revealed carcinoma ex pleomorphic adenoma with extracapsular infiltration, which is suggestive of a high risk of recurrence and metastasis. Therefore, strict follow-up is necessary in the future.
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