Fibrous syngnathia

What it means

Complete or nearly complete soft tissue fusion of the alveolar ridges.

This finding is associated with severely reduced mobility, or lack of mobility, between the upper and lower jaws. This finding is the severe end of a spectrum that includes oral synechiae.

Rare diseases that can present with this1

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: Alveolar synechiae · Fusion of the alveolar ridges