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residual thyroid tissue at the base of the tongue that failed to descend into the neck during embryologic development.
A small nodule of ectopic thyroid tissue located on the dorsal tongue, posterior to the circumvallate papillae. It is caused by failure of developing thyroid tissue to migrate from the area of the foramen cecum to its normal location in the neck.
See also: thyroid
lin·gual thy·roid(linggwăl thīroyd)
Ectopic thyroid tissue found at base of tongue.