While there are many different classifications of Mullerian duct anomalies, one most commonly used by the American Fertility Association is that of Buttram and Gibbons. The classification categorizes the anomalies into six (6) types: Agenesis uterine, or uterine hypoplasia, uterus unicornuate, uterus didelphys, uterus bicornuate (including arcuate uterus), uterus septate (septate uterus), uterine anomaly associated with diethylstilbestrol exposure.