Introduction: Mucocele is a cystic slow-growing lesion of paranasal sinuses with sterile content. Pyocele contains purulent substance. Muco-/pyocele is rarely localised in ethmoid or sphenoid sinus and may involve the orbit and cause ophthalmic complications including visual loss.
Material And Methods: We report the case of a 25-year-old woman who suffered from sudden visual loss of her left eye. She was treated for optic nerve papillitis by neurologists and ophthalmologists with steroids and recovered after about 6 weeks. Magnetic resonance imaging was ordered to find the cause of visual disturbance and revealed an oval-shaped lesion in the left posterior ethmoid sinus. The patient underwent functional endoscopic surgery and transethmoidal marsupialisation of the muco-/pyocele.
Results: After endoscopic microsurgery the patient recovered without complications, she is under follow-up and has no symptoms of any disease. Because there were no evidence of any other causes of optic nerve affection, the muco-/pyocele was regarded as the cause of visual loss.
Conclusions: The posterior ethmoid muco-/pyocele can present with ophthalmic manifestations including blindness. Endonasal operation and steroids administration are the treatment of choice in such cases.
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