Cleft Lip and Cleft Palate

The embryological development of craniofacial structures is an intricate sequential process involving tissue growth and directed cell apoptosis. Disruption of any step in this process may result in the formation of a cleft lip alone or in combination with a cleft palate. As the most common craniofacial malformation of the newborn, the diagnosis of a cleft is clinical and usually apparent at birth. The type and severity of the defect cause various degrees of difficulty with speech development, feeding, swallowing, tooth eruption, and cosmetic issues. Ultimate correction is through surgical repair.

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Overview

Classification

  • Orofacial clefts (OFCs) can be isolated or part of a multi-organ syndrome. 
  • OFCs include:
    • Cleft lip (CL) with or without cleft palate (CLP)
    • Cleft palate (CP) 
  • Typical orofacial clefts can be further subdivided based on the anatomy and position of the cleft: 
    • Clefts anterior to the alveolus (unilateral, median, or bilateral) 
    • Complete and incomplete clefts
    • Postalveolar clefts
Cleft lip

Cleft lip

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Cleft palate

Cleft palate

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Epidemiology

The prevalence of orofacial clefts varies widely around the world. The following data are specific to the United States.

  • Prevalence: Unilateral presentation is more common than bilateral.
    • CL: 3.1 per 10,000 live births
    • CP: 5.9 per 10,000 live births
    • CLP: 5.6 per 10.000 live births
  • Prevalence based on infant gender:
    • CL and CLP are more common in males.
    • CP is more common in females.
  • Prevalence based on maternal factors:
    • Age
      • CL, CP, and CLP are more common in infants born to mothers aged 35 and older.
      • May be due to higher prevalence of trisomy 13 and 18 in these children
    • Ethnicity
      • Prevalence of OFC is similar overall between ethnicities, with 2 exceptions:
        • Infants of non-Hispanic Native Americans/Alaskan Native mothers have a higher-than-average prevalence of OFC.
        • Infants of non-Hispanic African American mothers have a significantly lower prevalence of OFC.
    • Health factors: increased prevalence of OFC is seen in children of mothers who:
      • Smoke
      • Are diabetic
      • Are obese
      • Consume alcohol during pregnancy

Etiology

  • Nonsyndromic clefts have multifactorial etiologies:
    • Genetics
      • Twin studies show a genetic component to non-syndromic clefting.
      • Multiple genes are implicated; mutations in interferon regulatory factor 6 (IRF6) are commonly seen with nonsyndromic clefting.
    • Environmental
      • Maternal exposures
        • Alcohol consumption
        • Smoking
        • Pre-gestational and gestational diabetes
        • Folate deficiency during pregnancy
    • Teratogens
      • Anti-seizure medications
        • Phenytoin
        • Valproate
        • Topiramate
      • Folate antagonists
        • Methotrexate
        • Retinoic acid
  • Syndromic clefts: Multiple syndromes feature CL, CP, and CLP as part of the constellation of symptoms. 
    • Pierre Robin sequence 
    • Patau syndrome (trisomy 13) 
    • Edwards syndrome (trisomy 18) 
    • DiGeorge syndrome (partial deletion in chromosome 22)

Pathophysiology

All clefts arise from errors in the embryological development of the face.

  • CL: failure of medial and lateral nasal processes to merge maxillary process during 1st trimester
    • Can be unilateral or bilateral
    • May extend to the nostril
    • May extend deeper and involve the alveolus
    • If failure of fusion extends to palatal shelves, it results in CLP.
  • CP: partial or lack of fusion only involving the palatal shelves
Development of the lip

Development of the lip

Image by Lecturio.
Formation of the palate

Formation of the palate

Image by Lecturio.

Clinical Presentation

  • Cleft lip
    • Unilateral or bilateral
    • Cleft primary palate: Cleft involves the upper lip and alveolus (i.e., anterior to incisive foramen).
    • CLP: involving the palate in addition to the upper lip and alveolus (rarely, alveolus may be intact)
    • Severity may vary: complete (involving the nostril), incomplete, or lesser-form (e.g., micro)  
  • Cleft palate
    • Soft palate only
    • Soft palate and secondary (i.e., posterior to incisive foramen) hard palate
    • Submucosal: Cleft is hidden underneath a mucosal layer.

Diagnosis and Management

Diagnosis

  • Prenatal 
    • Ultrasound
      • Cannot be done before 1314 weeks as facial structures have not solidified sufficiently
      • Cleft lip is relatively easy to identify by ultrasound.
      • Cleft palate may need magnetic resonance imaging (MRI) to be identified.
    • Amniocentesis: Prenatal diagnosis may prompt investigation for other syndromic features.
  • Postnatal
    • Clinical diagnosis: at birth, full evaluation of the infant’s suck/swallow ability to determine how to best assist oral feeding
    • Full head-to-toe evaluation for comorbidities with particular attention to:
      • Nervous system (33% of associated anomalies)
      • Cardiac system (24% of associated anomalies)
    • Genetics consultation

Management

  • Presurgical management:
    • The goal is to facilitate feeding to allow the infant to grow to age and weight required for surgical correction.
    • A multidisciplinary team of healthcare providers is required. 
    • Feeding bottles with large-bore nipples
    • Nasoalveolar molding (orthodontist)
    • Lip taping or lip adhesions
  • Surgical repair of cleft lip is based on the “rule of 10s”: when infant is at least 10 weeks old and weighs 10 pounds and hemoglobin has reached 10 mg/dL
  • Surgical repair of cleft palate from 912 months followed by long-term speech therapy
  • Alveolar correction may be performed at 79 years followed by other corrective surgeries.

References

  1. Tolarová MM, Cervenka J. Classification and birth prevalence of orofacial clefts. Am J Med Genet. 1998;75(2):126-137. https://pubmed.ncbi.nlm.nih.gov/9450872/ 
  2. Mai CT, Cassell CH, Meyer RE, et al. Birth defects data from population-based birth defects surveillance programs in the United States, 2007 to 2011: highlighting orofacial clefts. Birth Defects Res A Clin Mol Teratol. 2014;100(11):895-904. doi:10.1002/bdra.23329 https://pubmed.ncbi.nlm.nih.gov/25399767/ 
  3. Shkoukani MA, Chen M, Vong A. Cleft lip – a comprehensive review. Front Pediatr. 2013;1:53. Published 2013 Dec 27. doi:10.3389/fped.2013.00053 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873527/

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