{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T07:02:28Z","timestamp":1776236548665,"version":"3.50.1"},"reference-count":41,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2025,8,26]],"date-time":"2025-08-26T00:00:00Z","timestamp":1756166400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004351","name":"Sultan Qaboos University","doi-asserted-by":"publisher","award":["UF\/MED\/ANAT\/24\/02"],"award-info":[{"award-number":["UF\/MED\/ANAT\/24\/02"]}],"id":[{"id":"10.13039\/501100004351","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Diagnostics"],"abstract":"<jats:p>Background\/Objectives: The abdominal aorta (AA) bifurcates at the level of the L4 vertebra, giving origin to the right and left common iliac arteries (CIA). The CIA then bifurcates into external iliac arteries (EIA) and internal iliac arteries (IIA). The present radiological study aimed to (i) measure the diameter of the right and left CIA, (ii) measure the distance between the AA bifurcation and the point where the ureter crossed the ipsilateral iliac vessels, (iii) examine the angle of AA bifurcation, and (iv) observe the vertebral level at which the AA bifurcated. Methods: The retrospective cross-sectional study included contrast-enhanced CT angiograms of 200 patients (n = 144 males and 56 females) who attended the radiology department from 1 January 2022 to 31 December 2023. Two independent radiologists interpreted the angiograms. The results were interpreted using parametric and non-parametric statistical tests. Results: The mean angle of the AA bifurcation was 40.46\u00b0 and 44.68\u00b0 in males and females, respectively (p = 0.013). The mean diameter of the right and left CIA was wider in males than in females, but no statistical significance was found. The average distance between the AA bifurcation and the point where the right and left ureter crossed the ipsilateral iliac arteries was longer in females (60.99 and 60.29 mm, respectively) than in males (59.05 and 59.95 mm, respectively), but no statistical difference was found (p &gt; 0.05). The most common vertebral level for AA bifurcation was the L4 vertebra, which was found in 137 (68.50%) patients. The AA bifurcated at the level of L3 and L5 in 52 (26.00%) and 11 (5.50%) patients, respectively. Conclusions: Understanding the radiological anatomy of the CIA and AA bifurcation and its relation to the ureter is crucial for surgeons performing aortic and pelvic surgeries.<\/jats:p>","DOI":"10.3390\/diagnostics15172167","type":"journal-article","created":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T08:19:32Z","timestamp":1756282772000},"page":"2167","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Level of Abdominal Aorta Bifurcation and Its Relation to the Ureter: A Radiological Study with Clinical Implications"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-6043-3870","authenticated-orcid":false,"given":"Mohammed","family":"Al-Hajri","sequence":"first","affiliation":[{"name":"Department of Human & Clinical Anatomy, College of Medicine & Health Sciences, Sultan Qaboos University, Muscat 123, Oman"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-5595-3521","authenticated-orcid":false,"given":"Ali","family":"Abduwani","sequence":"additional","affiliation":[{"name":"Department of Human & Clinical Anatomy, College of Medicine & Health Sciences, Sultan Qaboos University, Muscat 123, Oman"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-4439-4737","authenticated-orcid":false,"given":"Ilyas","family":"Al-Saadi","sequence":"additional","affiliation":[{"name":"Department of Human & Clinical Anatomy, College of Medicine & Health Sciences, Sultan Qaboos University, Muscat 123, Oman"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-8382-6514","authenticated-orcid":false,"given":"Nasser Al","family":"Sidairi","sequence":"additional","affiliation":[{"name":"Radiology Program, Oman Medical Specialty Board, Muscat 132, Oman"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-4797-9871","authenticated-orcid":false,"given":"Mahmood Salim Nasser Al","family":"Riyami","sequence":"additional","affiliation":[{"name":"Department of Radiology & Molecular Imaging, Sultan Qaboos University Hospital, Muscat 123, Oman"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2647-4805","authenticated-orcid":false,"given":"Saleh","family":"Baawain","sequence":"additional","affiliation":[{"name":"Department of Radiology & Molecular Imaging, Sultan Qaboos University Hospital, Muscat 123, Oman"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8302-7257","authenticated-orcid":false,"given":"Srijit","family":"Das","sequence":"additional","affiliation":[{"name":"Department of Human & Clinical Anatomy, College of Medicine & Health Sciences, Sultan Qaboos University, Muscat 123, Oman"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,8,26]]},"reference":[{"key":"ref_1","unstructured":"Tran, C.T., Wu, C.Y., Bordes, S.J., and Lui, F. (2025). Anatomy, Abdomen and Pelvis: Abdominal Aorta. StatPearls, StatPearls Publishing."},{"key":"ref_2","unstructured":"Snell, R.S. (2012). Clinical Anatomy by Regions, Lippincott Williams & Wilkins. [9th ed.]."},{"key":"ref_3","unstructured":"Zaunbrecher, N., Arbor, T.C., and Samra, N.S. (2025). Anatomy, Abdomen and Pelvis: Internal Iliac Arteries. StatPearls, StatPearls Publishing."},{"key":"ref_4","unstructured":"Hammond, E., Nassereddin, A., and Costanza, M. (2025). Anatomy, Abdomen and Pelvis: External Iliac Arteries. StatPearls, StatPearls Publishing."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"328","DOI":"10.1016\/j.avsg.2017.01.009","article-title":"Systematic Review of Results of Kissing Stents in the Treatment of Aortoiliac Occlusive Disease","volume":"42","author":"Holewijn","year":"2017","journal-title":"Ann. Vasc. Surg."},{"key":"ref_6","first-page":"181","article-title":"Aortic Bifurcation Angle as an Independent Risk Factor for Aortoiliac Occlusive Disease","volume":"66","author":"Shakeri","year":"2007","journal-title":"Folia Morphol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"99","DOI":"10.1016\/S0021-9150(00)00374-9","article-title":"Effect of Hypertension and Risk Factors on Diameters of Abdominal Aorta and Common Iliac and Femoral Arteries in Middle-Aged Hypertensive and Control Subjects: A Cross-Sectional Systematic Study with Duplex Ultrasound","volume":"153","author":"Merikanto","year":"2000","journal-title":"Atherosclerosis"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"238","DOI":"10.1016\/j.avsg.2019.05.030","article-title":"Normal Diameter and Growth Rate of Infrarenal Aorta and Common Iliac Artery in Chinese Population Measured by Contrast-Enhanced Computed Tomography","volume":"62","author":"Wang","year":"2020","journal-title":"Ann. Vasc. Surg."},{"key":"ref_9","unstructured":"Lescay, H.A., Jiang, J., Leslie, S.W., and Tuma, F. (2024). Anatomy, Abdomen and Pelvis Ureter. StatPearls, StatPearls Publishing."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Chiva, L.M., and Magrina, J. (2018). Abdominal and Pelvic Anatomy. Principles of Gynecologic Oncology Surgery, Elsevier.","DOI":"10.1016\/B978-0-323-42878-1.00002-X"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1080\/13645706.2019.1692038","article-title":"Digital Anatomic Study of the Ureter Relative to Bifurcation of the Common Iliac Artery in Females","volume":"30","author":"Han","year":"2021","journal-title":"Minim. Invasive Ther. Allied Technol."},{"key":"ref_12","first-page":"17","article-title":"Preliminary Understanding of Abdominal Aortic and Common Iliac Artery Diameters on Abdominal CT in Ethiopian Adults: A Facility-Based Cross-Sectional Study","volume":"32","author":"Minichil","year":"2022","journal-title":"Ethiop. J. Health Sci."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1007\/s00276-010-0696-3","article-title":"Development of the Abdominal Aorta and Iliac Arteries during the Fetal Period: A Morphometric Study","volume":"33","author":"Sulak","year":"2011","journal-title":"Surg. Radiol. Anat."},{"key":"ref_14","unstructured":"Ahluwalia, N., Nassereddin, A., Arbor, T.C., and Futterman, B. (2025). Anatomy, Abdomen and Pelvis: Celiac Trunk. StatPearls, StatPearls Publishing."},{"key":"ref_15","unstructured":"Shaikh, H., Wehrle, C.J., and Khorasani-Zadeh, A. (2025). Anatomy, Abdomen and Pelvis: Superior Mesenteric Artery. StatPearls, StatPearls Publishing."},{"key":"ref_16","unstructured":"Skinner, D., Wehrle, C.J., and Van Fossen, K. (2025). Anatomy, Abdomen and Pelvis: Inferior Mesenteric Artery. StatPearls, StatPearls Publishing."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"978","DOI":"10.2484\/rcr.v9i3.978","article-title":"Novel, Congenital Iliac Arterial Anatomy: Absent Common Iliac Arteries and Left Internal Iliac Artery","volume":"9","author":"Green","year":"2014","journal-title":"Radiol. Case Rep."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"H189","DOI":"10.1152\/ajpheart.00087.2018","article-title":"Elastin, Arterial Mechanics, and Cardiovascular Disease","volume":"315","author":"Cocciolone","year":"2018","journal-title":"Am. J. Physiol. Heart Circ. Physiol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"107461","DOI":"10.1016\/j.carpath.2022.107461","article-title":"Peri-Adventitial Smooth Muscle\u2014Inheritance of the Iliac Arterial System?","volume":"61","author":"Kothari","year":"2022","journal-title":"Cardiovasc. Pathol."},{"key":"ref_20","unstructured":"Gartner, L.P., Hiatt, J.L., and Gartner, L.P. (2014). Color Atlas and Text of Histology, Wolters Kluwer Health\/Lippincott Williams & Wilkins. [6th ed.]."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1275","DOI":"10.1098\/rsif.2011.0727","article-title":"Determination of the Layer-Specific Distributed Collagen Fibre Orientations in Human Thoracic and Abdominal Aortas and Common Iliac Arteries","volume":"9","author":"Schriefl","year":"2012","journal-title":"J. R. Soc. Interface"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"e30026","DOI":"10.1097\/MD.0000000000030026","article-title":"Normal Diameters of Abdominal Aorta and Common Iliac Artery in Middle-Aged and Elderly Chinese Han People Based on CTA","volume":"101","author":"Hu","year":"2022","journal-title":"Medicine"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1007\/s12565-024-00808-z","article-title":"The Anatomy of the Common Iliac Artery: A Meta-Analysis Based on 5785 Cases","volume":"100","author":"Koziej","year":"2025","journal-title":"Anat. Sci. Int."},{"key":"ref_24","first-page":"e20200073","article-title":"Age and Sex and Their Influence on the Anatomy of the Abdominal Aorta and Its Branches","volume":"19","author":"Beckmann","year":"2020","journal-title":"J. Vasc. Bras."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"48","DOI":"10.3349\/ymj.2013.54.1.48","article-title":"Reference Diameters of the Abdominal Aorta and Iliac Arteries in the Korean Population","volume":"54","author":"Joh","year":"2013","journal-title":"Yonsei Med. J."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"783","DOI":"10.1016\/j.ejvs.2015.12.017","article-title":"Morphological Differences in the Aorto-Iliac Segment in AAA Patients of Caucasian and Asian Origin","volume":"51","author":"Banzic","year":"2016","journal-title":"Eur. J. Vasc. Endovasc. Surg."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"486.e1","DOI":"10.1016\/j.ajog.2013.02.039","article-title":"Vascular and Ureteral Anatomy Relative to the Midsacral Promontory","volume":"208","author":"Good","year":"2013","journal-title":"Am. J. Obstet. Gynecol."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"681836","DOI":"10.1155\/2015\/681836","article-title":"Ureteral Dilatation with No Apparent Cause on Intravenous Urography: Normal or Abnormal? A Pilot Study","volume":"2015","author":"Rathi","year":"2015","journal-title":"Adv. Urol."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"138","DOI":"10.2478\/jtim-2018-0020","article-title":"Non-Invasive Evaluation of Fluid Dynamic of Aortoiliac Atherosclerotic Disease: Impact of Bifurcation Angle and Different Stent Configurations","volume":"6","author":"Rigatelli","year":"2018","journal-title":"J. Transl. Int. Med."},{"key":"ref_30","first-page":"1564","article-title":"Anatomical Variations of the Position of the Aortic Bifurcation, Iliocava Junction and Iliac Veins in Relation to the Lumbar Vertebra","volume":"91","author":"Lakchayapakorn","year":"2008","journal-title":"J. Med. Assoc. Thai"},{"key":"ref_31","first-page":"AC06","article-title":"Study of Aortic- Common Iliac Bifurcation and Its Clinical Significance","volume":"8","author":"Deswal","year":"2014","journal-title":"J. Clin. Diagn. Res."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"66","DOI":"10.1016\/j.lers.2022.01.002","article-title":"Variations in the Bifurcation Level of the Abdominal Aorta, Formation Level of the Inferior Vena Cava, and Insertion Level of the Left Renal Vein into the Inferior Vena Cava and Their Clinical Importance in Laparoscopic Surgery","volume":"5","author":"Khader","year":"2022","journal-title":"Laparosc. Endosc. Robot. Surg."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"308","DOI":"10.1007\/s00276-002-0036-3","article-title":"The Anatomical Relationship of the Aortic Bifurcation to the Lumbar Vertebrae: A MRI Study","volume":"24","author":"Chithriki","year":"2002","journal-title":"Surg. Radiol. Anat."},{"key":"ref_34","first-page":"47","article-title":"Aortic Bifurcation: A Cadaveric Study of Its Relationship to the Spine","volume":"92","author":"Khamanarong","year":"2009","journal-title":"J. Med. Assoc. Thai"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1007\/s100160010125","article-title":"Ureteral Injury during Aortic Aneurysm Repair by the Retroperitoneal Approach","volume":"15","author":"Sheehan","year":"2001","journal-title":"Ann. Vasc. Surg."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1007\/s10140-002-0195-x","article-title":"Ureteral Leak after an Abdominal Aortic Aneurysm Repair: Case Report","volume":"9","author":"Guttikonda","year":"2002","journal-title":"Emerg. Radiol."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"E50","DOI":"10.5489\/cuaj.10154","article-title":"Large Minimally Symptomatic Iatrogenic Urinoma Presenting Three Years after Abdominal Aortic Aneurysm Repair","volume":"6","author":"Spurrell","year":"2012","journal-title":"Can. Urol. Assoc. J. J. Assoc. Urol. Can."},{"key":"ref_38","unstructured":"Engelsgjerd, J.S., and LaGrange, C.A. (2025). Ureteral Injury. StatPearls, StatPearls Publishing."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"19","DOI":"10.1016\/j.urology.2020.08.049","article-title":"Malpractice Litigation in Iatrogenic Ureteral Injury: A Legal Database Review","volume":"146","author":"Bole","year":"2020","journal-title":"Urology"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"100975","DOI":"10.1016\/j.semss.2022.100975","article-title":"Anterior Lumbar Interbody Fusion","volume":"34","author":"Younis","year":"2022","journal-title":"Semin. Spine Surg."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1016\/j.spinee.2003.12.003","article-title":"Vascular Injury during Anterior Lumbar Surgery","volume":"4","author":"Brau","year":"2004","journal-title":"Spine J."}],"container-title":["Diagnostics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2075-4418\/15\/17\/2167\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:33:24Z","timestamp":1760034804000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2075-4418\/15\/17\/2167"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,8,26]]},"references-count":41,"journal-issue":{"issue":"17","published-online":{"date-parts":[[2025,9]]}},"alternative-id":["diagnostics15172167"],"URL":"https:\/\/doi.org\/10.3390\/diagnostics15172167","relation":{},"ISSN":["2075-4418"],"issn-type":[{"value":"2075-4418","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,8,26]]}}}