 It occurs when the proximal (upper) portion of the paramesonephric ducts does not fuse, but the distal portion that develops into the lower uterine segment, cervix, and upper vagina fuses normally.Diagnosis of bicornuate uterus typically involves imaging of the uterus with 2D or 3D ultrasound, hysterosalpingography, or magnetic resonance imaging (MRI).On imaging, a bicornuate uterus can be distinguished from a septate uterus by the angle between the cornua (intercornual angle)