This occurs when the two Mullerian ducts don't fuse during development & stay separated instead of developing into one. As the fetus develops, the tubes normally join to create one larger, but not in this instance.

seen from China

seen from Denmark

seen from United States
seen from United States
seen from Kazakhstan
seen from Romania
seen from Türkiye
seen from Türkiye
seen from Germany

seen from Brazil
seen from Germany

seen from Malaysia
seen from United States

seen from Germany
seen from Bangladesh

seen from United States
seen from United States
seen from United Kingdom

seen from India

seen from United States
This occurs when the two Mullerian ducts don't fuse during development & stay separated instead of developing into one. As the fetus develops, the tubes normally join to create one larger, but not in this instance.