What evaluation and management are recommended for a newborn with a preauricular pit (indentation in the skin above the ear)?

Preauricular Pit Management in Newborns

A newborn with a preauricular pit (indentation above the ear) requires hearing assessment and targeted evaluation for associated syndromes, particularly branchio-oto-renal syndrome, but does NOT routinely need renal imaging if the pit is isolated and the infant appears otherwise healthy.

Initial Assessment

When you identify a preauricular pit in a newborn, your evaluation should focus on:

Physical Examination - Look for Syndromic Features

The presence of a preauricular pit can signal genetic syndromes, particularly branchio-oto-renal (BOR) syndrome 1. Carefully examine for:

• Branchial anomalies: branchial cysts or fistulas on the neck
• Renal signs: though these require imaging to detect structural defects
• Other ear anomalies: aural atresia, ear tags, hearing loss
• Facial dysmorphology: cleft palate, dental anomalies
• Eye findings: heterochromia, retinal abnormalities
• Cardiac symptoms: syncope, arrhythmias (prolonged QT)
• Integumentary changes: white forelock, abnormal pigmentation

Family History - Three Generation Pedigree

Document 1:

• Hearing loss in family members (age of onset, progression, severity)
• Consanguinity
• Renal disease
• Cardiac disease or sudden death
• Similar ear anomalies in relatives

Hearing Evaluation - This is MANDATORY

The most critical action is hearing assessment because preauricular pits are associated with significantly increased risk of permanent hearing impairment. Research shows infants with preauricular tags or pits have an 8 per 1,000 prevalence of hearing impairment compared to 1.5 per 1,000 in the general population—representing a nearly 5-fold increased risk 2. Even in otherwise healthy infants with isolated pits, the hearing impairment rate is 3.4 per 1,000 2.

Implement:

• Ensure newborn hearing screening is completed (transient evoked otoacoustic emissions are effective in this population 2)
• If screening is failed or not performed, refer for comprehensive audiological evaluation 3, 4
• Consider brainstem-evoked response audiometry at 4 months if initial screening is abnormal 5

The hearing impairment can be conductive, sensorineural, or mixed 5, and early detection is essential for language development and quality of life.

Renal Imaging - NOT Routinely Indicated for Isolated Pits

Controversy exists regarding renal ultrasonography. While older guidelines suggested screening for renal anomalies 6, more recent evidence shows that renal ultrasound is NOT indicated for isolated preauricular pits in otherwise healthy newborns 7.

A prospective study of 92 infants with isolated preauricular tags or pits found only 2.2% had renal abnormalities (mild pyelectasis), which was not significantly different from the 3.1% rate in control infants without ear anomalies 7. This rate is comparable to the general population prevalence of 0.2-8.1% 7.

However, renal ultrasound IS indicated if:

• Other features suggest BOR syndrome (branchial cysts, family history of renal disease, hearing loss)
• Multiple congenital anomalies are present
• Dysmorphic features are identified 4, 8

Genetic Evaluation and Counseling

If syndromic features are present or family history is concerning 1:

• Refer for genetics consultation
• Consider gene-specific testing for BOR syndrome if clinical suspicion is high
• Provide genetic counseling regarding recurrence risk

Infection Risk and Monitoring

Preauricular sinuses can become infected, typically with gram-positive bacteria 8. Counsel parents to:

• Watch for signs of infection (redness, swelling, discharge)
• Seek care if infection develops
• Understand that recurrent infection is an indication for complete surgical excision 8, 9

Important caveat: If infection occurs and requires drainage, ensure the surgeon recognizes this is a sinus tract requiring complete excision, not just a simple abscess. Failure to identify the sinus leads to inadequate treatment and recurrence 9.

Follow-Up Algorithm

For isolated preauricular pit with normal hearing and no syndromic features:

• Routine well-child care
• Continued developmental surveillance including auditory skills 3
• No routine renal imaging

For preauricular pit with failed hearing screen or syndromic features:

• Comprehensive audiological evaluation
• Renal ultrasound
• Genetics referral
• Additional testing based on specific findings (ECG if cardiac concerns, ophthalmology if visual concerns) 1, 4

The key is recognizing that hearing assessment takes priority over renal imaging for isolated pits, as the hearing impairment risk is well-established and significantly elevated, while renal anomaly risk in truly isolated cases is not increased above baseline population rates.