We report the case of a 52-year-old woman who developed vertical diplopia of 1-days duration. Neuro-ophthalmological testing revealed left trochlear nerve palsy, and sellar MRI revealed a 1.5 cm-sized pituitary mass lesion, a Rathke's cleft cyst. The diplopia disappeared spontaneously after 6 days.
Central Nervous System Cysts/*complications/pathology ; Female ; Human ; Magnetic Resonance Imaging ; Middle Aged ; Trochlear Nerve Diseases/*etiology/pathology