A 6-month-old infant presents with persistent epiphora, mucopurulent discharge, and a mucous reflux on pressure over the lacrimal sac (Regurgitation test positive). The condition persists despite conservative management (Crigler massage, topical antibiotics). At what age is probing of the nasolacrimal duct MOST appropriate, and what is the failure mode that necessitates earlier intervention?

• A Probing at 6 months; failure to probe early causes permanent dacryocystic fibrosis
• B Probing at 9-12 months if spontaneous resolution does not occur; earlier if acute dacryocystitis develops ✓
• C Probing should be deferred until 18-24 months to allow spontaneous resolution
• D Probing is contraindicated before 2 years; use DCR (dacryocystorhinostomy) instead

Explanation

Congenital nasolacrimal duct obstruction (CNLDO) results from a persistent Hasner's membrane at the lower end of the nasolacrimal duct. Spontaneous resolution occurs in up to 90% of cases by 9-12 months with conservative Crigler massage. Standard recommendation is to wait until 9-12 months before probing. However, probing should be done earlier if: acute dacryocystitis or preseptal/orbital cellulitis develops (infection), as repeated episodes risk permanent lacrimal sac scarring. After failed initial probing, bicanalicular intubation (silicon tube intubation) is the next step.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.