CTICasesEctopic Mediastinal Thyroid Tissue
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Imaging findings
A non-contrast CT shows a very high-attenuation lesion in the mediastinum, resembling thyroid tissue, with no clear connection to the cervical thyroid gland. A nuclear medicine study confirmed uptake throughout the mediastinum, indicating thyroid tissue. Biopsy confirmed thyroid tissue.
Key takeaways
Ectopic thyroid tissue can occur in the mediastinum and typically presents as a high-attenuation mass on non-contrast CT due to its iodine content. Nuclear medicine studies are useful for confirmation. Most ectopic thyroids are connected to the cervical gland, but some are completely separate.
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