Table 1.

Cervical nerve root injection findings based on CT and dissection.

	Number of injections retrieved	Direct contact between injectate and nerve root frequency (%)	Median (IQR) distance between injectate and nerve root if no direct contact (mm)	Injectate presence within vertebral vessels frequency (%)	Injectate noted in nerve sheath frequency (%)	Injectate noted in vertebral canal frequency (%)
CT	55	76.4*	13 (4.0)	3.6 (vessel wall)	N/A	3.6
Dissection	57	Ventral and dorsal branches: 73.7 Dorsal branch: 98.3	4 (3.5)	0	11	1.7

^*Direct contact was determined when contrast media accumulated around tubular filling defects in the anatomic location of the nerve roots, just lateral to the respective intervertebral foramen.