Fig. 6From: Navigation-guided nasal endoscopic surgery for acute vision loss caused by fibrous dysplasia: a case report and review of literaturesOrbital MRI before surgey. A Orbital MRI indicates cystic degeneration in patients with fibrous dysplasia of bone (marked by red stars). B The red arrow shows the optic nerve in the canal. C The red arrow shows the integrity of the dura mater and no collapse of the skull base. D Shows the overall situation in MRIBack to article page