Fig. 2

Dorsal transdural approach and removal of an intradural non-calcified disc sequester causing a CSF leak. After laminectomy of thoracic vertebrae 12 (Th12), a dorsal dural opening was performed (Panel a). Subsequently, medial mobilisation of the spinal cord (under continuous intraoperative neurophysiological monitoring) revealed an intradural disc sequester at the location of the dural leakage (Panel b). After resection of the disc sequester, a water-tight ventral (and dorsal) dural closure was conducted (Panel c). Finally, dorsal dural closure and laminoplasty of Th12 concluded the intervention (Panel d)