Congenital Anomalies in Lacrimal Drainage.

Congenital dacryostenosis is the most common reason for ophthalmic consultation in childhood. It is most often caused by persisting of Hasner's membrane. However, congenital malformations of the lacrimal drainage system can also occur in rare cases. In the area of the proximal lacrimal drainage system, supernumerary lacrimal puncta and canaliculi can arise as well as diverticula, fistula, and atresia. The distal lacrimal drainage system can be affected by fistulas, amniotoceles, and cysts. Association of lacrimal malformations with congenital systemic diseases is reported in about 10% of cases. Depending on the severity of the symptoms, surgical rehabilitation can be performed, and endoscopic procedures and modern lacrimal drainage intubation systems may be employed.