Congenital lacrimal sac diverticulum.

We report the case of a 6-month-old boy with recurrent episodes of acute dacryocystitis from age 3 months to 1 year of age. The cause was determined to be congenital nasolacrimal sac diverticulum, a rare and commonly asymptomatic entity. An isolated diverticulectomy without dacryocystorhinostomy was performed because of lacrimal drainage system patency. At 6 months' follow-up the patient remained asymptomatic.