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Computed tomography angiography reconstruction in a coronal plane using Anatomage system showing location of transverse process (TP) in relation to ribs and lamina (L). A needle insertion point 2.5–3.0 cm lateral to spinous process maximizes the likelihood that the needle (1) will contact TP and not rib or lamina. Red arrows denote mean distance of 2.5–3.0 cm as measured by software.
