A 13 years old female caucasition admitted in 5 Azar General Hospital with a 3-day history of deteriorating vision. 2 weeks prior to admission she had received a Measles-Rubella vaccination at school (As a mass compain of MR vaccination in Iran). General & neurological examination except lung wheezing & ocular findings were normal. In visual exam she had questionable light perception in right eye & hand motion sensation in left eye. Funduscopy revealed moderate bilateral optic disc hyperemia.

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... vestigations revealed normal full cell blood count, biochemistry profile, clotting studies & sputum. Brain CT scan & MRI were normal except pansinusitis. CSF examination revealed normal constituents. The patient treated with Methyl Prednisolone (1 gr/daily) for 7 days and patient had dramatic response to therapy. After 6 weeks of starting medical treatment ophthalmologic exam revealed 2 meters finger count vision in right eye & 6/10 visual aquity in Left side. This patient is a rare case of bilateral optic neuritis after MR vaccination.