Unnamed Ossicle Medial to Navicular

I couldn't find a name for this ossicle medial to the navicular. It's clearly not an os naviculare, as it is too distal and too medial. Keats simply calls it "an unnamed ossicle adjacent to the navicular."

References

Keats TE and Anderson MW. Atlas of Normal Roentgen Variants That May Simulate Disease. 8th edition, page 847; Mosby (2004).