PMC7265265_01
(a) Fundus photograph at baseline. No signs of optic nerve compression are noticed (b and c) magnetic resonance imaging (fat-saturated post contrast T1-weighted axial and coronal cuts, respectively) at presentation depicting an iso-dense bilobed cystic lesion lateral to the ethmoid sinuses, compressing the optic nerve inferomedially (orange arrow) (d) Fundus photograph at week 4 postoperatively. Progression of optic nerve pallor is noted (e and f) magnetic resonance imaging (fat-saturated post contrast T1-weighted axial and coronal cuts, respectively) at week 1 postoperatively. The area corresponding to the evacuated cyst is marked with the orange arrow
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F1
Dilated fundoscopy was not diagnostic for optic disc edema or vein congestion, while the rest of the retina appeared normal [Figure 1a]. The lesion was located in the superior aspect of the sphenoid sinus and extended to the left orbital apex in close proximity to the left optic nerve [Figure 1b and c]. Fundoscopy and fundus photography at 4 weeks postoperatively showed progressively established paleness of the optic disc [Figure 1d], while MRI sequences confirmed the complete evacuation of the cystic lesion [Figure 1e and f].