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  • Title: Prevalence of incidental thyroid disease in a relatively low iodine intake area.
    Author: Tomimori E, Pedrinola F, Cavaliere H, Knobel M, Medeiros-Neto G.
    Journal: Thyroid; 1995 Aug; 5(4):273-6. PubMed ID: 7488867.
    Abstract:
    An ultrasonographic survey of thyroid abnormalities was conducted in 547 consecutive apparently normal overweight subjects (380 females and 167 males), aged 27-58 years in an urban area with relatively low iodine intake (mean daily urinary iodine excretion: 10.6 micrograms/dL). Individuals with any previous thyroid disease or familial thyroid pathology were excluded. In 240 subjects (44%) high resolution ultrasonography of the thyroid was considered normal. In 307 individuals (56%) abnormalities of the echo structure (39%) or thyroid nodular disease (17%) were detected by ultrasonography. Marked heterogeneity of the echo structure that was considered suggestive of chronic autoimmune thyroiditis was present in 81 subjects (15%). In 72 of these patients the serum anti-TPO levels were positive by a sensitive RIA. Thyroid nodules either solid or predominantly cystic were present in 90 subjects (17%). Eighteen patients had a relatively large nodule (diameter 15-18 mm). Eleven of these nodules were missed at clinical examination. Fine needle aspiration cytology was performed in 14 patients and 7 individuals underwent thyroid surgery. In 6 subjects the pathologic diagnosis was benign adenomatous goiter and one patient had a follicular carcinoma. Thyroid function studies confirmed subclinical hypothyroidism in 27 patients (4.9%), all of them with elevated serum anti-TPO autoantibodies levels. It was concluded that the overall occurrence of thyroid disease is more common than suspected by clinical examination.
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