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. 2022 Sep 10;50(3):285–310. doi: 10.1007/s10396-022-01236-0

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© The Author(s) 2022, corrected publication 2023

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Fig. 22 — Sigmoid colon Short-axis view of the sigmoid colon (a). Longitudinal view of the sigmoid colon in front of the iliopsoas muscle and the external iliac artery (b). The central part is partially collapsed (arrow), while the oral and anal sides contain a relatively hard stool with a distinctive acoustic shadow (arrowheads)