Fig. 7.

Intraoperative endoscopic view of representative case 2. A : Left C4 nerve root was exposed which located within narrowed C3-C4 intervertebral foramen. The distance between the upper and lower pedicle was significantly reduced. B : Endoscopic ultrasound osteotome was used to perform partial C3 pediculectomy (at the same level with C4 nerve root). C : Endoscopic ultrasound osteotome was used to perform partial C4 pediculectomy and partial vertebral body resection (this location is below the level of the nerve root). D : The left C4 nerve root was fully decompressed and freed.