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Fig. 1. Determination of the dorsal root ganglion (DRG) position. A and B are lines connecting the medial and lateral borders of the pedicles, respectively. If the midpoint of the DRG lies proximal to A, it is intraspinal type. If it is between A and B, it is foraminal type. If it is distal to B, it is extraforaminal type.
The Korean Journal of Pain 2019;32:280~285
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