Segmental odontomaxillary dysplasia is a painless, unilateral enlargement of the upper jaw. The cause is unknown, and the disease affects the jaws, teeth, and adjacent soft tissue. The premolars may be congenitally missing, and the primary teeth (baby teeth) may be smaller than usual. It is a relatively recent discovery. Description
It is a rare developmental disorder that affects maxilla, also known as the upper jaw in most vertebrates. The disorder is often diagnosed in early childhood. Since its original description as hemimaxillofacial dysplasia by doctors in 1987, less than 40 cases have been reported in the English literature. Epidiomology
All cases reported appear to represent sporadic occurrence. There is no specific inheritance pattern. The male-to-female ratio of affected is 1.8:1 and is often diagnosed before the age of 9. The disorder affects the right and left sides of the maxilla almost equally. References

Kahn, Michael A. Basic Oral and Maxillofacial Pathology. Volume 1. 2001.
This sudden compression and decompression in breech birth may cause no problems at all, but it can injure the brain. This injury is more likely in preterm babies. The fetal head may be controlled by a special two-handed grip call the Mauriceau–Smellie–Veit maneuver or the elective application of forceps. This will be of value in controlling the rate of delivery of the head and reduce decompression. Related to potential head trauma, researchers have identified a relationship between breech birth and autism.Squeezing the babys abdomen can damage internal organs. Positioning the baby incorrectly while using forceps to deliver the after coming head can damage the spine or spinal cord. It is important for the birth attendant to be knowledgeable, skilled, and experienced with all variations of breech birth. Factors influencing safety
Birth attendants skill (and experience with breech birth) – The skill of the doctor or midwife and the number of breech births previously assisted is of crucial importance. Many of the dangers in vaginal birth for breech babies come from mistakes made by birth attendants. With the majority of breech babies being delivered by cesarean section there is more risk that birth attendants will lose their skills in delivering breech babies and therefore increase the risk of harm to the baby during a vaginal delivery. Type of breech presentation – the frank breech has the most favorable outcomes in vaginal birth, with many studies suggesting no difference in outcome compared to head down babies.