Orbital intradiploic giant epidermoid cyst

We report a case of an intradiploic epidermoid cyst of the lateral orbital wall that resulted in proptosis and downward displacement of the left eye. Computed tomography and magnetic resonance imaging revealed a bone-destroyi ng mass involving the frontal, sphenoid, and zygomatic bones that extended into the orbit, temporalis, and anterior cranial fossa. Complete surgical r emoval was performed through a lateral orbitotomy. The lateral wall was rec onstructed with a porous polyethylene sheet. The cyst has not recurred afte r 18 months of follow-up.