USMLE Step 2 CK Lecture Notes 2019: Obstetrics/Gynecology (Kaplan Test Prep)

In some cases, the rudimentary horn contains a cavity that is continuous with
the healthy single-horn uterus but is much smaller than the cavity within the
healthy uterus.
There is a risk that a pregnancy will implant in this rudimentary horn, but
because of space limitations 90% of such pregnancies rupture.