[Transdural spinal cord herniation: A rare cause of Brown-Sequard syndrome]. / La hernie transdurale de la moelle épinieré thoracique, une cause rare de syndrome de Brown-Séquard.

We report a rare case of thoracic spinal cord herniation due to a defect of the anterior dura mater causing a progressive myelopathy. This case, illustrated by magnetic resonance and surgical imageries, will make the reader aware of this entity and then prevent misdiagnosis.