Abstract
Mucocoeles of the sphenoid sinus are rare (Nefson, 1957). A case is presented where such a lesion occurred in an area affected by fibrous dysplasia, a previously unreported combination. A 25-year-old woman was referred to the Wessex Neurological Centre having rapidly become blind in the left eye ten days earlier. The vision in her right eye then deteriorated progressively such that on admission she was completely blind. There was no history of earlier visual disturbance, chronic sinus disease or craniofacial trauma. Examination confirmed that she was totally blind and the pupils were fixed and dilated. There was slight left proptosis but no orbital or facial asymmetry.

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