Demonstrates direction of needle approaches of interlaminar and transforaminal epidural injection as well as their related cervical spine structures. *Arrow: interlaminar needle approach; **arrow: transforaminal needle approach. a: vertebral artery; b: intervertebral disc; c: nerve root; d: cervical spinal cord; e: ligamentum flavum; f: facet joint.|@|~(^,^)~|@|Demonstrates direction of C arm detector for lateral view and contralateral oblique (CLO) view when left paramedian interlaminar epidural injection is performed. Right CLO line is correspondent to left ventral laminar line and can visualize accurate needle depth. a: lateral view; b: CLO. *Needle approach.|@|~(^,^)~|@|(A, B) Anteroposterior and lateral view respectively that show the contrast filling into right facet joint, which suggests that contrast spreads into space of Okada and further facet joint communicated with this space, instead of dorsal epidural space.
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