Perineal tears that involve the anal sphincter, especially those which are occult, are common in cases of vaginal delivery or instrumental deliveries. Parturients who experience such types of perineal tears may suffer from flatus or fecal incontinence and also fistula to various surrounding organs. There is no consensus in the relevant medical literature regarding the risk factors for the development of these tears, as contradictive results are presented in various relevant studies. Traditional methods for perineal protection, executed by midwives, such as perineal massage with oil, have also failed to be proven as an effective measure for that purpose. The only theme on which there appears to be a consensus is the fact that protective episiotomy is not helpful in protecting the perineum during vaginal delivery. The inability to predict which parturient will have a perineal tear that involves the anal sphincter, as well as the lack of predictive measures to avoid their occurrence, drive more and more women to demand and receive cesarean section by maternal request, which is accepted by most obstetricians nowadays.
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