[Echinococcic cyst of the thyroid].

The Authors, starting from observation of a hydatid cyst of the thyroid, make an examination of this very rare pathological occurrence. They then put forward and evaluate the fundamental problem linked to this localisation of hydatidosis, a problem which can be summed up as the lack of pathological identification of the clinical pattern and the consequent ease of making a diagnostic error. They conclude by stating that the sole differential diagnostic criterion in relation to other diseases that may be considered (cystic uninodular goitre, adenoma, epithelial cyst, haematic pseudocyst) consists in the simple recollection of the possible existence of this very rare localisation of the echinococcus.