A Rare Case of Systemic Amyloidosis Involving the Thyroid in a Young Patient.

Thyroid amyloidosis is a rare condition associated with thyroid pathologies such as medullary carcinoma, papillary carcinoma, amyloid goitre, and benign lesions, with a clinically palpable goitre being exceptionally uncommon. As a result, many cases of benign thyroid enlargement caused by amyloid deposits remain undiagnosed. A 28-year-old male patient noticed progressive neck circumference enlargement, voice alteration, decreased appetite, weight loss, dysphagia, fever, and night sweats. Fine-needle aspiration biopsy of the thyroid gland did not reveal the cause of the goitre. A total thyroidectomy was performed. Histopathological examination confirmed advanced thyroid amyloidosis.