CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) at Chughtai Lab

CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) at Chughtai Lab

The CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) at Chughtai Lab is a highly specialized, non-invasive diagnostic imaging procedure designed to evaluate the health, structure, and patency of the primary arterial pathways in the abdomen and pelvis. By utilizing state-of-the-art multi-detector computed tomography (MDCT) technology combined with an intravenous iodinated contrast medium, this examination provides high-resolution, three-dimensional cross-sectional images of the abdominal aorta and the iliac arterial system. Chughtai Lab, a premier diagnostic network in Pakistan, performs this advanced scan to assist vascular surgeons, cardiologists, and interventional radiologists in diagnosing complex vascular diseases, planning surgical interventions, and monitoring treatment outcomes.

The abdominal aorta is the largest blood vessel in the abdominal cavity, responsible for delivering oxygenated blood from the heart to the lower half of the body. As it descends, it gives off major visceral branches—including the celiac trunk, superior mesenteric artery (SMA), inferior mesenteric artery (IMA), and renal arteries—before bifurcating at the level of the fourth lumbar vertebra into the common iliac arteries. These, in turn, divide into the internal and external iliac arteries to supply blood to the pelvic organs and lower extremities. A CT angiogram allows for the precise visualization of these vessels, detecting luminal narrowing, aneurysmal dilatation, arterial dissection, plaque accumulation, and anatomical variations with exceptional clinical accuracy.

Clinical Procedure: What to Expect

Patient Preparation

Proper patient preparation is essential to ensure diagnostic clarity, optimize image quality, and guarantee patient safety during a contrast-enhanced CT scan. Patients scheduled for a CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) at Chughtai Lab must adhere to the following guidelines:

• Fasting Requirements: Patients are generally instructed to fast (no solid food) for 4 to 6 hours prior to the scan. Clear fluids, such as water, are encouraged up to the time of the procedure to maintain adequate hydration.
• Renal Function Testing: Because the intravenous contrast medium is excreted through the kidneys, patients must provide a recent Serum Creatinine and estimated Glomerular Filtration Rate (eGFR) report (usually within the last 30 days). This is critical to rule out pre-existing renal impairment and minimize the risk of contrast-induced nephropathy (CIN).
• Allergy Screening: Patients must inform the clinical staff of any history of allergies, particularly to iodine, contrast media, shellfish, or medications. If a prior mild allergic reaction is documented, a pre-medication regimen consisting of antihistamines and corticosteroids may be prescribed.
• Medication Management: Patients taking Metformin for diabetes must consult their physician. In many cases, Metformin must be temporarily discontinued on the day of the scan and withheld for 48 hours post-procedure, pending confirmation of normal renal function. Other routine medications can usually be taken with a small sip of water.
• Clothing and Accessories: Patients should wear comfortable, loose-fitting clothing. All metallic objects, including jewelry, belts, zippers, and piercings, must be removed from the abdominal and pelvic regions, as metal causes severe streaking artifacts on CT images.

During the Procedure

Upon arrival at the Chughtai Lab imaging department, the patient is greeted by a registered radiologic technologist. The procedure follows a highly structured clinical protocol:

• Intravenous Access: A high-flow intravenous (IV) cannula (typically 18 to 20 gauge) is inserted into a suitable vein, usually in the antecubital fossa of the arm. This is necessary to facilitate the rapid injection of the iodinated contrast medium via an automated dual-head power injector.
• Patient Positioning: The patient lies supine (on their back) on the motorized CT scanner table. To ensure stability and minimize motion artifacts, comfortable straps or cushions may be used. The patient’s arms are positioned above their head to prevent beam-hardening artifacts across the abdomen.
• Contrast Injection and Scanning: The scan utilizes a technique called “bolus tracking.” A region of interest is placed over the abdominal aorta. As the power injector delivers the contrast medium at a precise rate (typically 4 to 5 mL/second), the scanner monitors the enhancement level. Once the contrast reaches peak opacification in the abdominal aorta, the scan is automatically triggered.
• The Contrast Sensation: As the contrast medium enters the bloodstream, patients commonly experience a transient warm flush throughout the body, a metallic taste in the mouth, and a brief sensation of needing to urinate. These are normal physiological responses and subside within a minute.
• Breath-Holding Instructions: During the scan, which takes only 10 to 15 seconds, the patient will be instructed via an automated voice system to hold their breath. Remaining perfectly still is vital to prevent respiratory motion artifacts that can obscure fine vascular details.
• Post-Procedure Care: Once the imaging is complete, the IV cannula is removed, and a light dressing is applied. The patient is monitored in a recovery area for 15 to 30 minutes to ensure no delayed allergic reactions occur. Patients are advised to drink plenty of water throughout the day to help flush the contrast medium from their system.

When is a CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) Performed?

Evaluation of Abdominal Aortic Aneurysm (AAA)

An abdominal aortic aneurysm (AAA) is a potentially life-threatening condition characterized by a localized ballooning of the abdominal aorta. Physicians request a CT angiogram when a patient presents with a pulsatile abdominal mass, persistent lower back pain, or vague abdominal discomfort, or when an aneurysm is incidentally detected on an ultrasound. The scan provides precise measurements of the aneurysm’s diameter, longitudinal extent, and relationship to the renal and iliac arteries, which is crucial for determining whether surgical intervention or Endovascular Aneurysm Repair (EVAR) is required.

Assessment of Peripheral Arterial Disease (PAD) and Claudication

Peripheral arterial disease affecting the aortoiliac segment can lead to severe lower extremity symptoms, including intermittent claudication (muscle pain or cramping in the calves, thighs, or buttocks triggered by walking), rest pain, and non-healing arterial ulcers. A CT angiogram is performed to identify the exact location, length, and severity of atherosclerotic stenoses or occlusions within the common, internal, and external iliac arteries, allowing vascular specialists to plan revascularization procedures such as angioplasty, stenting, or surgical bypass.

Investigation of Acute or Chronic Mesenteric Ischemia

Mesenteric ischemia occurs when blood flow to the visceral organs is compromised. Chronic mesenteric ischemia often presents as “abdominal angina”—severe, postprandial abdominal pain leading to fear of eating and significant weight loss. Acute mesenteric ischemia is a medical emergency presenting with sudden, severe abdominal pain out of proportion to physical findings. A contrast-enhanced CT angiogram is the gold standard for evaluating the patency of the celiac trunk, superior mesenteric artery, and inferior mesenteric artery to detect thrombosis, embolism, or severe stenosis.

Diagnosis of Renal Artery Stenosis and Secondary Hypertension

Renal artery stenosis (RAS) is a major cause of renovascular hypertension, a form of secondary high blood pressure that is often resistant to multiple antihypertensive medications. It can also lead to progressive ischemic nephropathy. A CT angiogram of the abdominal aorta allows for high-resolution visualization of the main and accessory renal arteries, enabling radiologists to detect narrowing caused by atherosclerosis or fibromuscular dysplasia (FMD) and assess its hemodynamic significance.

Detection of Acute Aortic Syndromes and Vascular Emergencies

Acute aortic syndromes, including aortic dissection, intramural hematoma, and penetrating atherosclerotic ulcers, are critical emergencies that require rapid, accurate diagnosis. Patients often present with sudden, excruciating, “tearing” or “ripping” pain in the abdomen, back, or chest. A CT angiogram provides rapid, comprehensive visualization of the entire abdominal aorta, allowing clinicians to identify the presence of an intimal tear, false lumen, active extravasation, or retroperitoneal hemorrhage associated with aortic rupture.

What Does a CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) Detect?

A CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) is capable of detecting a wide range of vascular pathologies, anatomical variations, and extravascular findings, including:

• Abdominal aortic aneurysm (AAA) with precise diameter and volume measurements.
• Atherosclerotic plaque burden, differentiating between calcified, non-calcified, and mixed plaques.
• Aortic dissection (Stanford Type B extending into the abdomen) showing true and false lumens.
• Leriche syndrome (complete aortoiliac occlusive disease).
• Stenosis or occlusion of the common, internal, and external iliac arteries.
• Renal artery stenosis caused by atherosclerosis or fibromuscular dysplasia (FMD).
• Accessory renal arteries and other anatomical vascular variants.
• Celiac trunk stenosis or occlusion, including Median Arcuate Ligament Syndrome (MALS).
• Superior mesenteric artery (SMA) thrombosis or embolism.
• Inferior mesenteric artery (IMA) narrowing or collateralization.
• Aortic rupture or active contrast extravasation into the retroperitoneum.
• Intramural hematoma (IMH) of the abdominal aorta.
• Penetrating atherosclerotic ulcer (PAU) of the aortic wall.
• Endoleaks (Types I-V) in patients who have undergone Endovascular Aneurysm Repair (EVAR).
• Vascular graft infection, thrombosis, or anastomotic pseudoaneurysm.
• Vasculitis affecting large and medium-sized vessels (e.g., Takayasu’s arteritis).
• Fibromuscular dysplasia of the iliac or visceral arteries.
• Retroperitoneal fibrosis causing extrinsic compression of the aorta or iliac vessels.
• Arteriovenous fistulas (AVFs) involving the abdominal or pelvic vasculature.
• Mycotic (infective) aneurysms of the aorta or branch vessels.
• Pseudoaneurysms of the hepatic, splenic, renal, or iliac arteries.
• Collateral circulation pathways (e.g., Arc of Riolan, Marginal Artery of Drummond).
• Extrinsic vascular compression by retroperitoneal or pelvic masses.
• Anatomical anomalies of the inferior vena cava (IVC) or renal veins (e.g., retroaortic left renal vein).

Turnaround Time and Report Access at Chughtai Lab

At Chughtai Lab, the acquisition of CT angiographic data is completed within minutes; however, the post-processing and interpretation of these complex images require meticulous analysis. Utilizing advanced workstation software, consultant radiologists perform multi-planar reconstructions (MPR), maximum intensity projections (MIP), and 3D volume-rendered formatting to thoroughly evaluate the vascular tree. The finalized, medically validated diagnostic report is typically available within 24 to 48 hours. Patients can conveniently access their reports and high-resolution digital images online through the official Chughtai Lab patient portal or the Chughtai Lab mobile application. Physical copies of the report and diagnostic films can also be collected directly from the diagnostic center where the scan was performed.

CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast) Findings Overview

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
Abdominal Aorta Diameter	Normal caliber (typically less than 3.0 cm, tapering distally).	Aneurysmal dilatation (diameter > 3.0 cm), ectasia, or focal narrowing.
Aortic Wall Integrity	Smooth, intact wall without thickening, calcification, or tears.	Dissection flap, intramural hematoma, penetrating ulcer, or mural thrombus.
Celiac & Mesenteric Arteries	Patent lumens with normal contrast opacification and no significant narrowing.	Stenosis, acute thrombosis, embolic occlusion, or extrinsic compression.
Renal Arteries	Single bilateral patent renal arteries with normal caliber and course.	Stenosis (proximal or mid-distal), accessory renal arteries, or fibromuscular dysplasia.
Common Iliac Arteries	Symmetric, patent vessels with a diameter typically under 1.5 cm.	Aneurysm, atherosclerotic stenosis, occlusion, or tortuosity.
Internal & External Iliac Arteries	Smooth vessel walls with continuous, unobstructed contrast enhancement.	Severe calcific plaque, focal stenosis, occlusion, or pseudoaneurysm.
Contrast Enhancement	Homogeneous, dense opacification of the arterial lumen during the arterial phase.	Filling defects (thrombus/embolus), poor opacification, or active extravasation.
Surrounding Retroperitoneum	Clear fat planes surrounding the vascular structures; no abnormal masses or fluid.	Retroperitoneal hematoma, soft tissue stranding, fibrosis, or lymphadenopathy.

Note: Diagnostic findings should always be interpreted by a qualified healthcare professional together with the patient’s symptoms, medical history, physical examination, laboratory investigations, previous imaging studies, and other relevant clinical information. Additional investigations or specialist consultation may be recommended depending on the findings.

Why Choose Chughtai Lab for CT Angiogram – Abdominal aorta and iliac arteries (with I/V contrast)?

• Experienced Healthcare Professionals: Scans are interpreted by highly qualified consultant radiologists specializing in cardiovascular and abdominal imaging.
• Patient-Focused Care: Dedicated clinical staff ensure patient comfort, safety, and clear communication throughout the imaging process.
• Quality Diagnostic Services: Chughtai Lab is committed to maintaining international standards of diagnostic accuracy and clinical excellence.
• Professional Reporting: Comprehensive, structured reports with detailed vascular measurements and high-resolution 3D reconstructions.
• Modern Diagnostic Approach: Utilization of advanced multi-slice CT scanners that offer rapid scan times and minimized radiation dose protocols.
• Comfortable Environment: State-of-the-art imaging suites designed to provide a reassuring and stress-free experience for patients.
• Convenient Location: An extensive network of diagnostic centers and collection points across Pakistan, ensuring easy accessibility.
• Commitment to Accurate Diagnosis: Strict quality control measures and automated contrast delivery systems to ensure optimal vascular opacification.