Final answer:
An episiotomy is a surgical incision made in the posterior vaginal wall and perineum to facilitate vaginal birth. It may be indicated for a woman who has fetal shoulder dystocia.
Step-by-step explanation:
An episiotomy is a surgical incision made in the posterior vaginal wall and perineum to facilitate vaginal birth. In the past, it was routine procedure, but now perineal tears are more commonly allowed to occur naturally. An episiotomy may be indicated for a woman who has fetal shoulder dystocia, which occurs when the baby's shoulder becomes stuck behind the mother's pubic bone during delivery.