![]() The descending-sigmoid flexure is an important landmark in large intestine morphology situated approximately width of two fingers (3 cm) from the left anterior superior iliac spine and one hand width (9-10 cm) from the median plane. The other measured distances were related to age, height, weight or BMI. This landmark distance remained constant from the left anterior superior iliac spine regardless of subject age, height and weight. In females, this landmark (mean ± standard deviation) was located 30.2 ± 8.4 mm from the left anterior superior iliac spine, 88.6 ± 14.2 mm from the median plane, and 115.4 ± 21.4 mm from the anterior aspect of the 5th lumbar vertebra. In one third of cases, the flexure formed an angle smaller than/or 90°. We visualised the descending-sigmoid flexure in all 227 subjects. The study protocol was reviewed and approved by the local ethics committee. In addition, the position of the descending-sigmoid flexure was assessed in relation to the left anterior superior iliac spine, the median plane, and anterior aspect of the 5th lumbar vertebra (in mm). We measured the angle between the descending colon and the proximal part of the sigmoid (in degrees). For inclusion, subjects were required to have a negative history for colonic disease and abdominopelvic surgery. We retrospectively enroled 227 individuals (96 female, 131 male) who underwent abdominopelvic computed tomography examination. If adjacent segments of the colon bend at acute angles (under 90°), endoscopy may become difficult and troublesome. colonoscopy, the tortuosity of the colon is a crucial factor for successful completion of the procedure. In invasive examinations of the colon, e.g. Curie-Sklodowskiej 68, 50-369 Wroclaw, Poland. ![]() 6 Department of General and Paediatric Radiology, Medical University of Wroclaw, M.5 Department of Oral Surgery, Wroclaw Medical University, Wroclaw, Krakowska 26, 50-425 Wroclaw, Poland.19, 91054 Erlangen, Germany Sechenov University, Department of Operative Surgery and Topographic Anatomy, Trubetskaya Street, 119991 Moscow, Russia. 4 Friedrich Alexander University Erlangen-Nürnberg (FAU), Institute of Functional and Clinical Anatomy, Universitätsstr.3 Department of Human Morphology and Embryology, Division of Anatomy, Wroclaw Medical University, Chalubinskiego 6a, 50-368 Wroclaw, Poland.Electronic address: 2 Department of General Radiology, Provincial Specialist Hospital in Legnica, Iwaszkiewicza 5, 59-220 Legnica, Poland. 1 Department of Human Morphology and Embryology, Division of Anatomy, Wroclaw Medical University, Chalubinskiego 6a, 50-368 Wroclaw, Poland.
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