Oncocytic carcinoma of the thyroid, previously referred to as Hurthle cell carcinoma, is a rare and aggressive form of thyroid cancer. In this particular case, a 71-year-old female presented with a palpable neck mass and a history of endoscopic thyroidectomy performed five years prior. Histopathological analysis confirmed the diagnosis of oncocytic carcinoma. In this report, we describe a unique case involving the implantation of a malignant tumor in a postoperative oncocytic thyroid adenoma, which notably exhibited the "flip-flop" phenomenon, as identified through nuclear imaging modalities.
Key words: Oncocytic carcinoma, endoscopic thyroidectomy, tumor implantation, flip-flop phenomenon.
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