Metastases to the thyroid

Metastases to the thyroid are an uncommon cause of thyroid malignancy.

Epidemiology

Metastases to the thyroid represent 1.4-3% of all malignancies . In autopsy series, the incidence is ~10% (range 2-24%) .

Pathology

The most common sites of primary malignancy include (note these will vary by region) :

Radiographic features

Ultrasound

Metastases to the thyroid most commonly have the following features :

  • hypoechoic lesion with poorly circumscribed margins (80%)
  • no calcifications
  • concurrent cervical lymphadenopathy (80%)
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