What is the most common etiology of a nasolacrimal duct obstruction in children?

What is the most common etiology of a nasolacrimal duct obstruction in children?

• A. Actinomyces israeli infection
• B. Staph aureus infection
• C. Involutional changes
• D. Valve of Hasner incomplete closure

Answer: (D)

In children, nasolacrimal duct obstruction is most commonly congenital and results from failure of canalization at the distal end of the duct where the valve of Hasner sits. If this valve doesn’t form a patent opening, tears cannot drain properly, leading to epiphora and often mucous discharge in infancy. This congenital obstruction at the valve of Hasner is the classic, most frequent cause in kids, whereas infections like Actinomyces israelii or Staphylococcus aureus are not typical primary etiologies of NLDO in children, and involutional (age-related) changes occur in adults, not in pediatric patients.

In children, nasolacrimal duct obstruction is most commonly congenital and results from failure of canalization at the distal end of the duct where the valve of Hasner sits. If this valve doesn’t form a patent opening, tears cannot drain properly, leading to epiphora and often mucous discharge in infancy. This congenital obstruction at the valve of Hasner is the classic, most frequent cause in kids, whereas infections like Actinomyces israelii or Staphylococcus aureus are not typical primary etiologies of NLDO in children, and involutional (age-related) changes occur in adults, not in pediatric patients.