Mitten deformity

What it means

Fusion of the hands and feet by a thin membrane of skin (scarring) seen in forms of dystrophic epidermolysis bullosa and leading to a "mitten" hand deformity.

Mitten deformity is also referred to as pseudosyndactyly, which should not be confused with true syndactyly (actual and complete fusion of fingers). Antenatally, pseudosyndactyly can be misinterpreted as syndactyly.

Rare diseases that can present with this6

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, and Orphanet separately records 3 diseases where this sign is specifically absent. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Pseudosyndactyly