From the Research
The normal diameter of the common iliac arteries typically ranges from 10 to 14 millimeters in adults, with an average of approximately 10.52 mm, as reported in the most recent and highest quality study 1. The length of the common iliac artery is generally around 5.59 mm before it bifurcates into the external and internal iliac arteries. These measurements can vary based on several factors including age, body size, gender, and ethnicity. As people age, their arteries may gradually dilate, with an increase of approximately 0.1 mm per decade being considered normal. Measurements exceeding 18 mm in diameter are generally considered aneurysmal. When evaluating common iliac arteries, it's essential to note that measurements should be taken perpendicular to the vessel's long axis, and that normal vessels should have smooth, parallel walls without significant tortuosity or stenosis. Understanding these normal parameters is crucial for accurately diagnosing vascular conditions such as aneurysms, stenosis, or occlusive disease. Some studies have reported variations in common iliac artery measurements, such as a study from 2004 that found interobserver variability in iliac artery measurements 2, and another study from 2022 that reported on isolated common iliac artery aneurysms 3. However, the most recent and highest quality study from 2025 provides the most accurate and reliable information on common iliac artery measurements 1. Other studies, such as those from 1998 and 2002, have also reported on common iliac artery measurements, but their findings are not as relevant or reliable as those from the 2025 study 4, 5. In clinical practice, it's essential to consider the most recent and highest quality evidence when evaluating common iliac artery measurements, and to prioritize morbidity, mortality, and quality of life as the primary outcomes. Key factors to consider when evaluating common iliac arteries include:
- Diameter: 10-14 mm
- Length: around 5.59 mm
- Age-related dilation: 0.1 mm per decade
- Aneurysmal measurements: exceeding 18 mm in diameter
- Measurement technique: perpendicular to the vessel's long axis
- Vessel characteristics: smooth, parallel walls without significant tortuosity or stenosis.