[Vesicular carcinoma in lingual thyroid: a rare case].

Lingual thyroid is secondary to the absence of migration of the thyroid diverticulum. The latter develops locally, that is, at the level of the foramen caecum. It may be the only thyroid tissue present, or it may be associated with a normal thyroid. The occurrence of a lingual thyroid carcinoma is rare accounting for about thirty cases described in the literature. This study reports a case of vesicular carcinoma in lingual thyroid.