true unicornuate uterus (MONDO_0015832) is a rare, non-syndromic uterovaginal malformation characterized by a crescent-shaped, small-sized uterus containing a single horn and fallopian tube with no rudimentary horn. Urinary tract anomalies are frequently associated. Also known as: complete unilateral Mullerian aplasia, complete unilateral Müllerian aplasia, complete unilateral aplasia of the Mullerian ducts, complete unilateral aplasia of the Müllerian ducts, unicornuate uterus without rudimentary horn.