[The secret of red eyes]

"Red eye" is a sign and the same time a symptom frequently met in the ophthalmological practice. The "red eye" is not always the clinical manifestation of a common conjunctivitis. We will present a case report of a patient who accused conjunctival hyperemia, lacrimation, foreign--body sensation; she was also describing recurrent conjunctivitis for the past year. After an detailed ophthalmologic examination and interdisciplinary consultations. She was diagnosed with Basedow Disease and paraselar meningioma with invasion in the pterigoid fossa. The authors are suggesting that there is an indirect left carotid - cavernous fistula.