[A child case of surfer's myelopathy].

We report a case of so-called "surfer's myelopathy" involving a 15-year-old girl. Preceding episodes of vaccination and infection were absent. She experienced back pain during a surfing class for beginners, followed by weakness in both legs, which progressed to paraperesis. Then, 2 days later, sensory disturbance and bladder/rectal disturbance also developed. Spinal MRI revealed a ischemic lesion compatible with anterior spinal cord syndrome. A combination of methylprednisolone pulse therapy and high-dose intravenous immunoglobulin therapy was effective leaving no residual dysfunction. The acute onset during the surfing class and characteristic MRI findings led to the diagnosis of surfer's myelopathy. Although rarely reported, warnings are warranted to prevent surfer's myelopathy and avoid the progressive deterioration of neurological dysfunction.