Involution of retinochoroidal shunt vessel after radiotherapy for optic nerve sheath meningioma.

PURPOSE: To illustrate the development and involution of retinochoroidal shunt vessel of the optic disc in a patient with primary optic nerve sheath meningioma. CASE REPORT: A 38-year-old woman presented with gradual onset of blurred vision in her right eye. Examination revealed a right relative afferent pupillary defect and mild edema of the right optic disc. Computed tomography (CT) showed changes consistent with a primary optic nerve sheath meningioma affecting the orbital portion of the right optic nerve. Patient was observed without treatment and subsequently developed a retinochoroidal shunt vessel on her right optic disc. With progression of the meningioma towards the optic chiasm, treatment with stereotactic radiosurgery was done. Following treatment, the optic disc gradually became pale and the retinochoroidal shunt vessel decreased in caliber with complete involution three years after radiotherapy.