Posterior embryotoxon

What it means

A posterior embryotoxon is the presence of a prominent and anteriorly displaced line of Schwalbe.

Schwalbe's line is the anatomical line found on the interior surface of the cornea, and delineates the outer limit of the corneal endothelium layer. Specifically, it represents the termination of Descemet's membrane. Up to 30% of the population has posterior embryotoxon as an isolated normal variant.

Rare diseases that can present with this8

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Embryotoxon