Positional plagiocephaly is a condition in which specific areas of an infant’s head develop an abnormally flattened shape and appearance. In more severe cases, the infant may have forehead or cheek protrusion on the flat side of his or her head.Click to see full answer. In this way, what happens if plagiocephaly is untreated? Living with plagiocephaly They can grow out of it naturally or correct it with therapy. It is unlikely to cause issues with their brain growth or function. However, if plagiocephaly is left untreated, children are at risk of developmental, neurological, or psychological difficulties.Additionally, is plagiocephaly dangerous? Positional plagiocephaly does not usually cause serious complications. If congenital plagiocephaly, which is caused by craniosynostosis, is left untreated, it can lead to serious complications, including: Head deformities, possibly severe and permanent. Increased pressure inside the head. Similarly one may ask, what is considered severe plagiocephaly? Scale for Measuring Plagiocephaly Normal head shape: 0 – 4 mm. Mild Plagiocephaly: 5 – 9 mm. Moderate Plagiocephaly: 10 – 15 mm. Severe Plagiocephaly: >15 mm.Does plagiocephaly get worse with age?Head shape and developmental delay associated with deformational plagiocephaly usually improve by age 4 years. The incidence of deformational plagiocephaly (abnormal head shape) has increased since introduction of the Back to Sleep campaign to prevent sudden infant death syndrome.