Choanal atresia is a congenital condition characterized by a bony and/or membranous obstruction of the posterior nasal passage. This obstruction may occur either unilaterally or bilaterally. Unilateral choanal atresia often presents late with chronic inflammation (e.g., rhinorrhea, congestion) of the affected nasal passage. Bilateral choanal atresia manifests as obstructed nasal breathing with intermittent cyanosis immediately after birth; breathing improves when crying, as it allows the infant to breathe through his or her mouth. The diagnosis is confirmed with contrast rhinography or CT imaging. The definitive treatment is surgery, in which the obstructive membrane or bony portion is perforated.
- Congenital condition; characterized by a bony (90% of cases) and/or membranous (10%) obstruction of the posterior nasal passage
- Sex: ♀ > ♂ (∼ 2:1)
- Unilateral choanal atresia is twice as common as bilateral choanal atresia.
- Frequently associated with other anomalies (“CHARGE syndrome” - coloboma, heart defects, atresia choanae (also known as choanal atresia), retardation of growth, genital abnormalities, and ear abnormalities)
Epidemiological data refers to the US, unless otherwise specified.
- Thyroid medications (methimazole, carbimazole)
- Cigarette smoking
- Caffeine (≥ 3 cups per day)
- Elevated levels of vitamin B12, zinc, and vitamin B3 (niacin)
- It has been hypothesized that the condition is due to:
Bilateral choanal atresia
- Early presentation
- Infants are only able to breathe through the mouth (immediately postpartum)
- Cyanosis that worsens when feeding and improves when crying
- Upper airway obstruction (e.g., noisy breathing, dyspnea)
- Food intake impossible: Complete airway obstruction is a life-threatening condition immediately following birth because of the worsening dyspnea associated with feeding.
- Unilateral choanal atresia
- The inability to pass the catheter through the nasal cavity is an indication of choanal atresia.
- Confirmatory tests: contrast rhinography in the supine position or CT scan
- Bilateral choanal atresia
Unilateral choanal atresia
- Observation and subsequent surgery when the infant is 1–2 years old