Severe papilledema identified 3 weeks after head injury.

A 62-year-old woman presented with rapidly developed visual disturbance without associated headache or nausea 3 weeks after head injury. Ophthalmologic examination revealed bilateral severe papilledema with retinal hemorrhage, and intracranial pressure (ICP) was 17.5 cmH2O estimated by lumbar puncture. Computed tomography and magnetic resonance (MR) imaging showed no evidence of increased ICP, except dilation of the subarachnoid space around the optic nerves with distortion of the nerves. Her visual acuity remarkably improved after steroid and glycerol treatment, and optic fundus examination revealed bilateral clear optic papillae without atrophic changes. Follow-up MR imaging demonstrated that the bilateral optic nerves had regained the normal appearance. These results indicate that the bilateral papilledema was caused by increased subarachnoid pressure around the bilateral optic nerves. We conclude that papilledema can occur with a mildly increased ICP and trapped subarachnoid cerebrospinal fluid around the optic nerves, and papilledema may progress after the ICP is normalized. Papilledema is a warning sign for increased ICP, associated with future visual loss from retinal hemorrhage. Therefore, repeated funduscopic investigation is necessary for the early diagnosis and treatment of papilledema.