Mentovertex

Mentovertex is a term used in obstetrics to describe a specific fetal position during childbirth. In this presentation, the fetus's chin (mentum) is positioned toward the mother's pelvis while the crown (vertex) is directed toward the birth canal. This creates an extended position where the fetal neck is hyperextended, making the face present toward the birth canal.

The mentovertex presentation is classified as a type of face presentation. Face presentations are relatively rare, occurring in approximately 0.1-0.3% of all deliveries. Among face presentations, the mentovertex position is one of the possible configurations.

When mentovertex presentation occurs, it often presents challenges for vaginal delivery due to the larger diameter of the fetal skull that must pass through the birth canal. The condition is typically diagnosed during a pelvic examination or through imaging studies such as ultrasound.

Management of mentovertex presentations depends on various factors including gestational age, fetal size, and the progression of labor. In many cases, healthcare providers may recommend cesarean delivery as the safest option, particularly if the mentovertex position persists or if there are signs of fetal distress.

The term originates from Latin, with "mentum" meaning chin and "vertex" meaning the highest point or crown of the head.