Accessory Ossicle, Thumb, XR, who is this?

[image: Thumb Accessory Ossicle.jpg]
[image: Thumb Accessory Ossicle (1).jpg]
Incidental finding in otherwise normal hand XRs in a 51F looking for OA. I
can’t find this in any reference or atlas, maybe embedded in the FPL?
Have you seen this, know what it’s called?

Hilary