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Acute diffuse thyroid swelling after fine‐needle aspiration: A case report and review of the literature

Fine‐needle aspiration (FNA) is the first‐line and a cost‐effective examination method of nonfunctional thyroid nodules. Acute transient thyroid swelling after an FNA is a rare complication, and to date, only 14 cases have been reported in the English literature. Herein, we report a case of a 26‐year‐old woman with acute transient thyroid swelling, which occurred after an ultrasound‐guided FNA of a thyroid nodule. Although the patient had undergone an FNA without complication 2 years previously, the second FNA caused acute thyroid swelling. The present case emphasizes the potential risk of acute thyroid swelling associated with every FNA procedure.