Coeliac Trunk - Branches, Stenosis, Dissection, Aneurysm & Anatomical Variants

Coeliac Trunk:

• What is Coeliac Trunk?
• Branches
• Stenosis
• Dissection
• Aneurysm
• Anatomical Variants

What is Coeliac Trunk?

The coeliac trunk, also called the celiac trunk or celiac artery, is one of the major branches of the abdominal aorta. It arises from the front of the abdominal aorta just below the diaphragm, usually at the level of the T12 vertebra. The coeliac trunk is responsible for supplying oxygenated blood to many upper abdominal organs, including the stomach, liver, spleen, pancreas, and part of the duodenum. Although it is a short artery, usually only about 1–2 cm in length, it plays a vital role in maintaining blood flow to the digestive system.

The coeliac trunk is considered the first major branch of the abdominal aorta and divides rapidly into several important arteries. Because of its central role in abdominal circulation, diseases affecting the coeliac trunk can lead to significant gastrointestinal symptoms and complications. Conditions such as stenosis, aneurysm, or dissection may reduce blood supply to abdominal organs, causing pain, ischemia, or life-threatening bleeding. Imaging studies such as CT angiography and Doppler ultrasound are commonly used to evaluate this artery and its branches.

Branches

The coeliac trunk classically divides into three major branches: the left gastric artery, the splenic artery, and the common hepatic artery. This classic branching pattern is often referred to as the “tripus Halleri.” The left gastric artery supplies the lesser curvature of the stomach and lower esophagus. The splenic artery travels toward the spleen while giving off branches to the pancreas and stomach. The common hepatic artery supplies the liver, gallbladder, stomach, and duodenum through its further branches.

Although the three-branch pattern is considered standard anatomy, many people have variations in branching. Additional arteries may arise directly from the coeliac trunk, or some branches may originate from the superior mesenteric artery instead. Understanding the branching anatomy is extremely important during abdominal surgeries, liver transplantation, pancreatic surgery, and interventional radiology procedures to avoid accidental injury or inadequate blood supply.

Stenosis

Coeliac trunk stenosis refers to narrowing of the artery, which can reduce blood flow to abdominal organs. One of the most common causes is compression by the median arcuate ligament, a fibrous band of the diaphragm. This condition is called Median Arcuate Ligament Syndrome (MALS). Atherosclerosis is another major cause, especially in older adults or patients with cardiovascular disease risk factors.

Patients with coeliac trunk stenosis may experience abdominal pain after eating, nausea, weight loss, or symptoms of intestinal ischemia. However, some individuals remain asymptomatic because collateral circulation from the superior mesenteric artery compensates for reduced flow. Diagnosis is usually made with CT angiography, MR angiography, or Doppler ultrasound. Treatment options include surgical decompression, angioplasty, or stenting depending on the cause and severity.

Dissection

A coeliac trunk dissection occurs when a tear develops in the inner wall of the artery, allowing blood to flow between vessel layers. This creates a false lumen that can obstruct blood flow or weaken the vessel wall. Although rare, spontaneous coeliac artery dissection is increasingly recognized due to improved imaging techniques. Risk factors include hypertension, connective tissue disorders, trauma, and vascular disease.

Symptoms may include sudden severe abdominal pain, back pain, nausea, or vomiting. Some patients are diagnosed incidentally during imaging for unrelated conditions. CT angiography is the preferred diagnostic method because it clearly shows the true and false lumens. Treatment depends on severity and may range from blood pressure control and monitoring to endovascular stenting or surgery if complications such as ischemia or rupture occur.

Aneurysm

A coeliac trunk aneurysm is an abnormal dilation or bulging of the artery wall. Although uncommon, it is considered a serious vascular condition because rupture can cause massive internal bleeding and high mortality. Causes include atherosclerosis, trauma, infection, connective tissue disorders, and inflammatory diseases. Many aneurysms remain asymptomatic and are discovered incidentally during imaging studies.

Larger aneurysms may cause abdominal pain, pulsatile masses, or compression of nearby structures. CT angiography is the gold standard for diagnosis and surgical planning. Treatment often depends on aneurysm size and risk of rupture. Small stable aneurysms may be monitored, while larger or symptomatic aneurysms are treated with endovascular stent grafts or open surgical repair to prevent rupture and restore safe blood flow.

Anatomical Variants

The coeliac trunk has several recognized anatomical variants, and these are clinically important in surgery and radiology. In some individuals, the coeliac trunk and superior mesenteric artery arise from a common origin called a celiacomesenteric trunk. In others, one of the usual branches may arise directly from the aorta rather than the coeliac trunk. Variants of the hepatic artery are especially common and significant in liver surgery and transplantation.

Knowledge of anatomical variants helps surgeons avoid vascular injury during procedures involving the liver, pancreas, stomach, or spleen. Radiologists also rely on this information when planning angiography or embolization procedures. Preoperative CT angiography is often performed to map vascular anatomy and identify unusual branching patterns before complex abdominal operations.