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Congenital Nasolacrimal Duct Obstruction

ROUTINE — Adnexa

Symptoms

  • Onset typically within the first 3 months of life.
  • Persistent tearing (epiphora) and crusting of the medial lashes.
  • Recurrent mucoid or mucopurulent discharge.
  • Erythema of the medial canthal skin.
  • Development of an increased tear meniscus.

Clinical Findings

Natural history

  • >90% of cases resolve spontaneously within the first 12 months of life.
  • Observation and conservative management are the preferred first-line approaches.

Exam characteristics

  • Wet-appearing eye with tears overflowing the lid margin.
  • Mucoid or mucopurulent reflux from the punctum upon lacrimal sac palpation.
  • Generally quiet, white eye without conjunctival injection.

Diagnostic tests

  • Dye Disappearance Test (DDT): Fluorescein remains pooled on the affected side after 5 minutes; confirms obstruction.

Clinical variants

  • Congenital Dacryocele (Amniotocele): Tense bluish cystic swelling at the medial canthus; neonatal emergency if bilateral due to potential airway obstruction (intranasal cysts).
  • Infant Dacryocystitis: Red, tender, warm mass over the sac with fever; requires urgent systemic antibiotics.

Critical mimic: congenital glaucoma

  • Must be ruled out in every tearing infant.
  • Associated with megalocornea (>12 mm), corneal cloudiness, Haab striae, and photophobia.

Etiology

Primary mechanism

  • Failure of the membrane to canalize at the distal end of the nasolacrimal duct (the Valve of Hasner).

Secondary factors

  • Bony stenosis of the canal (craniofacial syndromes).
  • Punctal or canalicular agenesis.
  • Concurrent intranasal cysts (dacryocele).

Red Flags

  • Dacryocystitis: Red, swollen sac with fever; risk of orbital cellulitis or meningitis.
  • Neonatal Dacryocele: Possible respiratory distress from intranasal extension.
  • Corneal Changes: Megalocornea or cloudiness suggests congenital glaucoma, not NLDO.
  • Failed Probing: Persistent symptoms after 12 months require escalation to intubation.

Investigations

Primary evaluation

  • Slit-lamp/External exam: Measure corneal diameters and check for Haab striae.
  • Palpation: Check for purulent reflux from the puncta.
  • Dye Disappearance Test: To objectively confirm poor drainage.

Specialized workup

  • ENT evaluation: If a dacryocele or intranasal cyst is suspected.
  • IOP measurement: To exclude congenital glaucoma.

Treatment

Conservative (first 12 months)

  • Crigler Massage: Digital downward pressure over the lacrimal sac 2–3 times daily.
  • Topical Antibiotics: Erythromycin or Polytrim for symptomatic mucopurulent discharge.

Surgical intervention

  • Nasolacrimal Duct Probing: Standard treatment if unresolved by 12 months; success rate 80–90%.
  • Silicone Intubation: Used for failed probing or complex canalicular anatomy.
  • Balloon Dacryoplasty: For refractory cases.
  • Dacryocystorhinostomy (DCR): Reserved for severe, persistent cases or bony abnormalities.

Clinical Pearl

Tearing in a baby that resolves by year one is almost always a membrane at the Valve of Hasner. Massage is the answer until 12 months, but always rule out congenital glaucoma first.

Differential Diagnosis

  • Congenital Glaucoma (look for megalocornea and photophobia)
  • Chronic Conjunctivitis
  • Punctal Agenesis
  • Dacryocele
  • Corneal Abrasion

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