[Incidentaloma of the thyroid].

Thyroid incidentalomas are common, often less than 1.5 cm in size, and frequently benign. It is recommended that low-risk patients with incidentalomas be followed up ultrasonographically in 6 to 12 months and not be subjected to routine testing with ultrasonographically guided fine-needle aspiration biopsy (US-FNA). In patients who have nodules larger than 1.5 cm in size, a history of head and neck irradiation, a strong family history of thyroid carcinoma, or ultrasonographic findings that suggest malignancy, US-FNA should be done. A patient with hypercalcemia caused by ectopic production of parathyroid hormone in papillary thyroid carcinoma was reported. It is known that medullary thyroid carcinoma rarely shows production of adrenocorticotropic hormone or serotonin. However, ectopic hormone productive tumors in the thyroid are extremely rare.