Metaplasias and neoplasias of Müllerian epithelium.

The three primary epithelia of the Müllerian system are correlated with the three anatomic divisions of that system. Exceptions to normally expected associations and complicating factors including squamous epithelia and clear cells are discussed. A rationale for anticipating these anomalies is offered, and a plea is made for a diagnostic system which will accommodate both the cell type of Müllerian tumours and their anatomic location.