Alien limb phenomenon

What it means

Alien limb phenomenon refers to involuntary motor activity of a limb in conjunction with the feeling of estrangement from that limb.

Alien limb serves as a diagnostic feature of corticobasal syndrome.

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