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BACKGROUND
An isolated aspergillosis of the sphenoidal sinus is a difficult diagnosis because the often misleading clinical symptoms of this rare disease can develop late and first be presented to the ophthalmologist. Because of this even life-threatening disease in normally immunodeficient patients, fast diagnostics and treatment is indicated.

CASE REPORT
We report about an immunocompetent man to suffer from an invasive aspergillosis involving the sphenoidal sinus after external operation of a mucocele. Aspergillus infiltrated the right orbit by bone erosion and led to an acute loss of vision on his right eye and a pathological visual field (visual acuity 0.1). A systemical antimycotic therapy was performed and the right orbit and the optical channel were operated to remove the mycosis. During operation the optical nerve was found to be completely surrounded by the mycosis. After surgery visual acuity recovered slowly but completely in about two weeks (visual acuity 1.0) and visual field examination revealed normal findings. These findings were stable now for one year.

CONCLUSION
The main findings of unilateral acute visual loss and pre-operations of the paranasal sinuses in combination with persistent headache can lead to the suspect of an aspergillosis infection. It is important to establish correct diagnosis--especially in immunocompetent patients--early to prevent a probably irreversible visual loss and in an advanced stage to handle the life-threatening risk of this disease.