gynecology and obstetrics
Fetal Presentation, Position, and Lie (Including Breech Presentation)
Face or brow presentation
In face presentation, the head is hyperextended, and position is designated by the position of the chin (mentum). When the chin is posterior, the head is less likely to rotate and less likely to deliver vaginally, necessitating cesarean delivery. Brow presentation usually converts spontaneously to vertex or face presentation. 