[Mucigenous cysts of the pituitary gland. 3 cases]

Three cases of mucous cysts, or Rathke's cyst, of the pituitary gland are reported. The clinical and biological features were comparable to those of a non-secreting adenoma. Although extremely rare, these cysts must be recognized since their particular and, in theory, specific characteristics (wall made up of a ciliated epithelium with mucus cells and cavity filled with a mucoid substance) distinguish them from other intra or suprasellar pathological formations, especially craniopharyngiomas. The 62 cases reported in the literature suggest that they have a favourable prognosis.