[Thyroid dysembryoma. Report of a case in an adult (author's transl)].

One case of dysembryoma of the thyroid gland is reported. 115 cases of that rare disease have been published; the tumor is particularly rare in adult (14 cases). Salient features are reviewed, mostly complications and malignant degeneration. Surgical removal is the only treatment and also the only mean to have histological diagnosis.