 Measuring the depth of the cleft between the cornua (fundal cleft) may also assist in diagnosis; a cleft of over is indicative of bicornuate uterus.Bicornuate uterus is typically classified based on whether or not the division extends to the external cervical os.Bicornuate uteri with a division above the os are called "bicornuate unicollis" and those with a divided os are called "bicornuate bicollis."