Fine-needle aspiration of parathyroid adenomas: Indications as a diagnostic approach.

When PA localization is unusual or inconclusive despite extensive imaging, FNA may be performed. We asserted that wedge pattern, salt and pepper chromatin, and the absence of colloid globules and nuclear grooves are diagnostic cytological indicators of PA rather than of FN or PDTC. We recommend PTH measurements using needle washout fluid for PA-suspected nodules, and immunocytochemistry with the GATA-3 antibody for cytologically PA-suspected nodules.