Mayer-Rokitansky-Küster-Hauser syndrome (Orphanet_3109, an Orphanet rare-disease nomenclature entry) can be described as follows. Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome describes a spectrum of Mullerian duct anomalies characterized by congenital aplasia of the uterus and upper two thirds of the vagina in otherwise phenotypically normal females. It can be classed as either type I (classical) MRKH or type II (atypical) MRKH (also known as MURCS association; see these terms), depending on if it is isolated or associated with other malformations. Also known as: MRKH syndrome, Rokitansky syndrome.