Müllerian anomalies “without a classification”: from the didelphys-unicollis uterus to the bicervical uterus with or without septate vagina

These case reports prove that the fusion and reabsorption processes in the development of the Müllerian ducts can be affected to different degrees in the superior-convergent and inferior-divergent portions, thus resulting in atypical or transitional cases without a classification. Therefore, for a more appropriate classification of the uterine malformations, even if the same degrees of fusion, resorption, and development defects are used, a separate classification should be made for each superior and inferior uterine segment.