Inspissated colloid in a thyroid nodule
Thyroid nodule seen incidentally on chest CT.
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Inspissated colloid and microcalcifications in a thyroid nodule can sometimes be confused on ultrasound. Reverberation artifact ("comet-tail artifact") can be useful to help make the diagnosis of inspissated colloid. Unlike microcalcifications, inspissated colloid does not confer increased malignancy risk to a thyroid nodule.