Evidence of prior surgery with laminectomy. Within the canal, displacing the cord, and compressing it, is a mass with intense high T2 signal, central low signal on all sequences, and thin peripheral enhancement.
Differential for a mass with this signal characteristic includes chondroid containing lesions (chondrosarcoma, osteochondroma) and chordoma. A cystic mass with dystrophic calcification (e.g. neurogenic tumour) is another possibility although appearances would be most unusual.