D2I2.
congenital

Unicornuate uterus

A unicornuate represents a where the uterus is formed from only one of the paired Müllerian ducts while the other Müllerian duct does not develop or only in a rudimentary fashion. The sometimes called hemi-uterus has a single horn linked to the ipsilateral fallopian tube that faces its ovary.

Underlined words are explained — tap any of them.

Plain-language summary adapted from Wikipedia. Not medical advice.