Aneurysmal bone cyst of the sphenoid in a child.

The aneurysmal bone cyst is a vascular lesion which destroys and expands bone. We report a case of an aneurysmal bone cyst of the sphenoid sinus which resulted in loss of vision due to compression of the optic chiasm. Staged intracranial and extracranial procedures were used to remove the lesion. Aneurysmal bone cysts are very rare in the sphenoid sinus, and this is the first reported case occurring at that site in a child.