Aneurysmal bone cyst of the sphenoid sinus

Aneurysmal bone cysts of the sphenoid sinus are very rare, with only six ca ses described in the literature. We present a case of an aneurysmal bone cy st of the sphenoid sinus with associated fibrous dysplasia in which the rad iological findings had some features of a mucocoele. We discuss the differe nces in pathogenesis, clinical presentation and radiological appearances be tween these two lesions, and propose a simple drainage procedure as an effe ctive modality of treatment.