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. 2021 Apr 30;12:58. doi: 10.1186/s13244-021-00999-3

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — “Whirlpool sign” in different patients. a, b A 34-year-old male with volvulus from the surgical group (D_YJ_RC_R, type 4a). The images show torsion of duodenum, proximal jejunum and mesenteric vessels (arrow). c A 30-year-old male with volvulus from the surgical group (D_YJ_RC_M, type 6). d, e Two males with volvulus from the conservative group (D_YJ_RC_R, type 4a). The degree of torsion of vessels and intestines is mild (arrow). f A 51-year-old asymptomatic female (D_YJ_RC_R, type 4a). The portal vein rotates anterior to the superior mesenteric artery