Diagnosis of parathyroid incidentaloma detected on thyroid ultrasonography: the role of fine-needle aspiration cytology and washout parathyroid hormone measurements.

US features, such as size, echogenicity, cystic change, vascularity, the location and depth of nodules, and the operator’s proficiency, did not reach statistical significance, whereas the number of FNAs was significantly associated with false-negative results on FNAC.

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