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case_images: Axial orbital MRI (T1FS) showed that the enhancing infiltrative lesion involved the right sphenoid sinus, clivus, prepontine cistern, and right-side cavernous sinus. It also encapsulated the right ICA and caused moderate luminal narrowing.
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case_images: The lesion also caused moderate luminal narrowing of the right internal carotid artery (ICA) (Figure 1). These MRI findings explained the patient's limitation in abduction due to sixth nerve palsy.
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case_images: (A) Axial brain MRI (T1FS) showed that the mass involved the left cavernous sinus and encased the left cavernous ICA without definite luminal narrowing. It extended posterosuperiorly along the retroclival and bilateral petroclival regions with a pressure effect on the left side of the pons and partially encased the basilar artery. (B) Axial brain MRI (T1FS) showed atrophy of the left lateral rectus muscle (arrow).
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case_images: ICA without definite luminal narrowing. It extended posterosuperiorly along the retroclival and bilateral petroclival regions with a pressure effect on the left side of the pons and partially encased the basilar artery (Figure 2A). Atrophy of the left lateral rectus muscle was also observed (Figure 2B).
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case_images: Axial brain MRI (T1FS) showed an enhancing infiltrative mass that involved the entire nasopharynx, posterior nasal cavities, bilateral sphenoid sinuses, and skull base, including the right Dorello's canal.
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case_images: Brain MRI showed an enhancing infiltrative mass that involved the entire nasopharynx, posterior nasal cavities, bilateral sphenoid sinuses, and skull base, including the right Dorello's canal, which affected the right sixth cranial nerve (Figure 3).
case_images: PMC8627281_04
case_images: Axial brain MRI (T1FS) showed an enhancing infiltrative mass that involved the right ethmoid and bilateral sphenoid sinuses with extension into the right orbit. The mass also encased the right cavernous ICA.
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case_images: The mass also encased the right cavernous ICA (Figure 4).
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case_images: (A) Axial brain MRI (T1FS) showed a large enhancing mass at the left sphenoid sinus and petrous bone with involvement of the sixth cranial nerve. (B) Axial T2-weighted DRIVE MRI showed involvement of the left Dorello's canal.
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case_images: Axial brain MRI showed a large enhancing mass at the left sphenoid sinus and petrous bone with involvement of the sixth cranial nerve (Figure 5A), and axial T2-weighted DRIVE MRI showed involvement of the left Dorello's canal (Figure 5B).