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. 2026 Jun 19;19:610083. doi: 10.2147/LRA.S610083

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© 2026 Chooklin and Chuklin.

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Grayscale ultrasound of soft tissue with RA label, markers, symbols and orientation on dark background. — The small intestine located in close proximity to the posterior layer of the rectus sheath. If the needle is advanced beyond the posterior rectus sheath in the same direction, bowel injury may occur. Arrowheads indicate the needle trajectory. The arrow indicates the bowel. The asterisk (*) marks the accumulation of local anesthetic. (Reproduced from Kwon et al²⁴ © Wolters Kluwer Health, Inc. Published with permission under STM Permissions Guidelines).

Abbreviation: RA, rectus abdominis muscle.