[Optic nerve trauma: case report of partial optic nerve avulsion].

Introduction: Partial avulsion of the optic nerve head is a rare and severe complication of ocular blunt trauma.
Observation: We report the case of a 28-year-old man presenting to the emergency department for blunt trauma to his right eye with a basketball. Visual acuity was decreased to hand motion, and fundus examination showed a prepapillary hemorrhage. After five days, the preretinal hematoma spontaneously dispersed into the vitreous cavity. Because of the persistence of an intravitreal hemorrhage and the lack of visual recovery, a vitrectomy was performed 2 months later, leading to the diagnosis of a partial optic nerve avulsion with cicatricial gliosis on fundus exam and angiography. Six months after vitrectomy, the visual acuity was 4/10 P4 in the right eye and the visual field showed an absolute infero-nasal scotoma corresponding to the temporal injury. Seven months later, the visual acuity had decreased progressively, secondary to the development of a macular epiretinal membrane. A membrane peel was performed with a visual acuity recovery to 3/10 P4 after a 3-year follow-up.
Discussion: Through a complete literature review, we describe the clinical signs, the mechanism, the treatment and the natural history of this poorly known disease.
Conclusion: Optic nerve avulsion must be considered in cases of trauma with forced rotation of the eye. Individualized management and monitoring of complications are essential to the preservation of residual visual acuity, especially in case of partial avulsion.
(Copyright © 2012 Elsevier Masson SAS. All rights reserved.)