A probable case of an "Hourglass" epidermoid cyst located in the posterior fossa in an individual from Ibi, Alicante, Spain (12-13 centuries AD).

Epidermoid bone cysts are rare, unilocular, and slow growing. They develop by the accumulation of ectodermal remnants, and they may be congenital or acquired. The most common locations for these bone cysts are the distal phalanges, followed by the skull.