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Determination of DRG position. The position of the DRG was determined on the original coronal FFE images. A and B are the lines respectively connecting the medial and lateral borders of the pedicles. If the midpoint of the DRG lies proximal to A, it is an intraspinal type; between A and B, a foraminal type; and distal to B, an extraforaminal type. In this 28-year-old volunteer, the L4 DRGs are the foraminal type (arrowheads). P indicates the L4 vertebral pedicles.
