A 16-year-old girl presented with progressive, painless proptosis of the left eye. X-ray studies revealed an extensive lesion involving the left orbit, antrum, and middle cranial fossa. A biopsy confirmed the diagnosis of aneurysmal bone cyst, and the lesion was surgically excised. There has been no evidence of recurrence after three years. In a review of the literature, we were able to find only seven other cases of aneurysmal bone cyst involving the orbit.
Powell JO, Glaser JS. Aneurysmal Bone Cyst of the Orbit. Arch Ophthalmol. 1975;93(5):340-342. doi:10.1001/archopht.1975.01010020352006