Clinical Significance of Bilateral Preauricular Pits in Infants
Bilateral preauricular pits in an infant warrant hearing assessment and consideration of genetic syndromes, particularly 22q11.2 deletion syndrome, as they are associated with significantly increased risk of permanent hearing impairment and may signal underlying syndromic conditions.
Immediate Clinical Actions
1. Hearing Assessment (Priority)
Infants with preauricular pits—especially bilateral—have a 4.9-fold increased risk of permanent hearing impairment compared to infants without these findings 1. The prevalence of hearing loss in this population is 8 per 1,000 versus 1.5 per 1,000 in the general newborn population 1.
- Perform hearing screening using transient-evoked otoacoustic emissions (TEOAE), which has proven effective for detecting hearing impairment in this population 1
- If abnormal, proceed to brainstem-evoked response audiometry by 4 months of age 2
- The hearing impairment can be conductive, sensorineural, or mixed 2
2. Evaluate for Associated Syndromes
22q11.2 Deletion Syndrome is the most important consideration, as bilateral preauricular pits are specifically mentioned as an associated minor malformation 3. Look for:
- Cardiac anomalies (most critical): congenital heart disease occurs frequently
- Palatal abnormalities: velopharyngeal dysfunction, cleft palate
- Hypocalcemia: may present as neonatal seizures
- Immune deficiency: recurrent infections, absent thymus
- Facial dysmorphism: malar flatness, hooded eyelids, bulbous nasal tip
- Feeding difficulties: failure to thrive
If any of these features are present, genetic testing for 22q11.2 deletion is indicated 3.
Other syndromes to consider:
- Goldenhar syndrome (oculo-auriculo-vertebral spectrum): look for hemifacial microsomia, limbus dermoid, vertebral anomalies 4
- 48,XXYY syndrome: particularly if congenital heart disease is present 5
3. Renal Evaluation
While the evidence specifically notes that "each patient with bilateral preauricular fistula needs to be diagnosed for congenital disorders of the middle ear and kidneys" 6, the strength of renal association is less robust than hearing impairment. Consider:
- Renal ultrasound if other syndromic features are present
- Renal ultrasound if bilateral pits are accompanied by other congenital anomalies (19% of infants with preauricular tags/pits have associated anomalies) 2
Key Clinical Pitfalls
Don't assume isolated findings are benign: Even "isolated" bilateral preauricular pits carry a significantly elevated risk (3.4 per 1,000) of hearing impairment in otherwise low-risk infants 1.
Bilateral versus unilateral matters: Bilateral presentation has stronger genetic associations (OR=26.5 for family history) compared to unilateral (OR=12.2) 7, and bilateral findings are more suggestive of syndromic conditions like 22q11.2DS 3.
Timing is critical: Hypocalcemia in 22q11.2DS may present as neonatal seizures and can be the first manifestation 3. Don't delay evaluation if other features are present.
Ethnic Considerations
Prevalence varies significantly by ethnicity: Asians (6.6%), African Americans (4.5%), Middle Easterners (3.4%), First Nations (2.0%), Caucasians (1.2%) 7. This doesn't change management but provides context for counseling families about recurrence risk.
Surgical Management
Surgery is not necessary for asymptomatic preauricular sinuses 6. Surgical excision is indicated only if:
- Recurrent infections occur
- Purulent discharge develops
- Cosmetic concerns arise (typically deferred until older age)