In congenital nasolacrimal duct obstruction, spontaneous resolution occurs in what percentage of cases by 12 months of age, informing the decision to delay probing?

• A 40–50%
• B 60–70%
• C 30–40%
• D 85–96% ✓

Explanation

Congenital NLDO (Hasner's membrane obstruction) resolves spontaneously in approximately 85–96% of cases by 12 months of age through natural membrane rupture during normal lacrimal sac massaging (Crigler massage). This high spontaneous resolution rate justifies conservative management with digital massage and topical antibiotics during the first year of life, reserving NLD probing for cases persisting beyond 12–13 months. The PEDIG (Pediatric Eye Disease Investigator Group) supported this approach — probing success rates decline after age 24 months.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.