Abstract
Three paratracheal lymph nodes of a 20-year-old patient were submitted for examination, of which one showed numerous thyrocytes with large void nuclei and was suspected of being metastatic papillary thyroid carcinoma. The simultaneously resected thyroid gland, which was subsequently submitted showed findings consistent with Hashimoto's autoimmune thyroiditis (AIT). In the context of the resected goiter tissue, the suspected lymph node metastasis was identified as a hyperplastic ectopic (so-called parasitic) goiter nodule with thyrocytic changes typically seen in Hashimoto's AIT, such as oxyphilic cell alterations and a high plasma cell content. The re-examination of the suspicious lymph node revealed complete lack of a marginal sinus, thus excluding the diagnosis of a lymph node as well as the diagnosis of thyroid carcinoma metastasis.
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