| Summary: | Thyroid abscesses are rare as the gland has a rich blood supply, well-developed capsule and is high in iodine. However, clinicians must be aware of this fact and make an early diagnosis as it can lead to serious morbidity if left untreated. Infection may involve one or both lobes of the thyroid gland, although the left lobe is more often affected and is successfully treated with surgery and antibiotics. This case study involves a 22-year-old woman with a history of painful swelling over the neck accompanied by low-grade fever without any underlying cause. Both the ultrasound and computed tomography revealed a heterogeneous mass within the left lobe of the thyroid gland. Fine needle aspiration revealed an abscess collection and culture Staphylococcus aureus had grown. She was successfully treated with intravenous and oral amoxicillin clavulanate and no surgical treatment was carried out. In conclusion, thyroid abscesses are rare as the gland is resistant to infection and must be differentiated from an infected branchial cleft cyst or sinus, infected thyroid tumour or lymphadenitis in the region of the thyroid in order to avoid serious morbidity if left untreated. © 2019 Societa Editrice Universo. All rights reserved.
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