3 learning resources available for this topic
Pierre Robin Sequence is a congenital condition characterized by a triad of micrognathia (small jaw), glossoptosis (posterior displacement of the tongue), and cleft palate. This sequence of developmental abnormalities occurs due to early mandibular hypoplasia during fetal development, leading to secondary tongue and palate malformations. The condition can occur as an isolated finding or as part of various genetic syndromes.
The primary defect begins with mandibular hypoplasia occurring between 7-11 weeks of gestation, which prevents normal descent of the tongue from between the developing palatal shelves. The persistently elevated tongue position interferes with proper palatal fusion, resulting in a U-shaped cleft palate. This mechanical sequence explains why the cleft palate is typically wide and the tongue appears relatively large for the oral cavity.
Diagnosis relies on recognizing the characteristic triad of features through physical examination and imaging studies. The severity of micrognathia determines the degree of airway obstruction and feeding difficulties, with severe cases requiring immediate airway management. Treatment planning must address both immediate concerns (airway patency and nutrition) and long-term reconstructive needs, often requiring multidisciplinary care involving neonatology, plastic surgery, and otolaryngology.