Pediatric Posterior Embryotoxon

Pediatric Posterior Embryotoxon



A child with posterior embryotoxon has an opaque (solid in color) ring in their cornea (covering of the eye).

Expanded overview

Posterior embryotoxon occurs when there is an opaque (solid in color) ring in their cornea, which is the transparent covering of the eye. In most cases, having posterior embryotoxon does not negatively affect the child’s ability to see.

This condition commonly occurs in children that also have Alagille syndrome, which is a genetic condition that causes problems in the liver and other areas of the body. A child with posterior embryotoxon may have another congenital (present at birth) condition, such as X-linked ichthyosis (hereditary skin condition caused by a deficiency of a certain enzyme) or familial aniridia (hereditary disorder that affects eye development).


Posterior embryotoxon is caused by a gene mutation that is passed down in families.


Signs and symptoms of posterior embryotoxon include a visible ring in the cornea that is solid in color.

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