Mitochondrial DNA “common deletion” in post-FNA infarcted oncocytic thyroid tumors

Thyroid fine needle aspiration (FNA) can rarely induce morphological changes potentially hindering the histopathological diagnosis, especially in Hurthle cell tumors (HCT), which may easily undergo post-FNA infarction or necrosis. HCTs contain mitochondrion (mt)-rich cells that may bear mtDNA mutations, the most frequent being the so-called "common deletion" (CD). The aim of this study was to determine the presence and extent of the mtDNA CD in a series of thyroid HCT that underwent extensive infarction following FNA procedure, in comparison with a control series of HCT lacking post-FNA ischemic/hemorrhagic alterations.

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