Unilateral development of the paired Mullerian ducts results in which uterine anomaly?

• A. Unicornuate
• B. Didelphys
• C. Bicornuate
• D. Septate

Answer: (A)

The uterus forms from two Müllerian ducts, and the final shape depends on how well those ducts fuse and how the tissue between them resorbs. If only one duct develops, you’re left with a single uterine horn—the unicornuate uterus. This often comes with a small rudimentary horn on the underdeveloped side and is commonly associated with renal anomalies on that same side, reflecting the linked development of the urinary and reproductive systems. The other uterine forms arise from different fusion/resorption patterns: two separate uterine bodies occur when fusion fails entirely (didelphys); partial fusion with two distinct horns and a single cervix happens with a bicornuate uterus; and a single external contour with a persistent internal septum occurs when the ducts fuse but the septum isn’t resorbed (septate uterus).