Intradural herniation of a thoracic disc presenting as flaccid paraplegia: case report. A case of intradural herniation of a thoracic disc in a patient with a flaccid paraplegia is described. Intradural herniation of a thoracic disc is considered a rare event. A review of the relevant patient literature revealed 14 other reports involving 28 patients. No other report has described a patient with an intradural thoracic disc herniation who developed a flaccid paraplegia. 