FIGURE LEGENDS
Fig 1. The imaging features of fibrous dysplasia located in the sphenoid bone in a 56-year-old patient (patient 1 in Table 1) in different dimensional CT scans (A). Because of no symptoms, the patient accepted a biopsy, which was identified as fibrous dysplasia. The patient was followed up until now. The image shows the nasal cavity and sinus of the patient eight years after the biopsy (B). (CT, computed tomography).
Fig 2. The imaging features of a 2-year-old patient (patient 3 in Table 2). The images show the axial and coronal views of CT scans and the sagittal view of the MRI of the paranasal sinuses before the operation (A). The removal of a fibrosis dysplasia lesion in the ethmoid bone under FESS (B). The mass removed from the ethmoid bone in the operation was confirmed to be fibrosis dysplasia by pathological examination (B). The photos under nasal endoscopy showed the nasal cavity after the endonasal endoscopic operation 3 months later and 1 year later, respectively (B). The white arrow shows the place of the removed lesion in the ethmoid bone. (MFD, monostotic fibrous dysplasia; CT, computed tomography; MRI, magnetic resonance imaging; FESS, functional endoscopic sinus surgery).
Fig 3. The imaging features of MAS in a ten-year-old patient (patient 4 in Table 3) (Fig. 3A and 3B). Images used during the navigation-assisted operation: sagittal, coronal, and axial scans, and the video (The first and the second operation: 3A and 3B). The patient received left optic nerve decompression using an endoscopic endonasal approach. Then the patient received left optic nerve decompression again one and a half years later because of her left visual loss again. The green dot shows the left orbital apex region (3A, 3B). Fig.3C showed the images used to aid image-guided navigation in MFD endoscopic sinus surgery (patient 9 in Table 2) . The white arrow shows the thin layer of fibrous tissue between the fibrous dysplasia lesions and the sphenoid bone (Fig.C). Fig.3D showed the imaging features of fibrous dysplasia with degeneration changes (patient 5 in Table 2). The paranasal sinus CT of MFD showed frosted glass changes of the left sphenoid pterygoid process and the great wing, with a 2.3× 1.0 cm soft tissue shadow, which was diagnosed as hyaline degeneration by pathological examination (Fig.3D). The CT scan showed the cystic degeneration of FD (Fig.3E-H). Axial CT scan of the 17-year-old patient (patient 1 in Table 3) with PFD showed the bilateral optic nerve compression due to cystic degeneration of FD (Fig.3E). The CT scan of two years before surgery revealed that the left optic nerve was completely encased and the right optic nerve was partially encased by FD (Fig.3F,G,H). (CT, computed tomography; MFD, monostotic fibrous dysplasia; PFD, polyostotic fibrous dysplasia; FD, fibrous dysplasia)