In a 59-year-old man with diabetes mellitus and a 40‑pack‑year smoking history who presents with diminished femoral and dorsalis pedis pulses bilaterally and an abdominal aortic bruit, which statement about obstructive atherosclerotic iliac artery disease is incorrect?

Statement D is INCORRECT

There is NO absolute indication for urgent CT or MR angiography in this patient with chronic, stable atherosclerotic iliac artery disease presenting with diminished pulses and a bruit. 1, 2

Why This Statement is Wrong

This patient presents with chronic symptomatic peripheral artery disease (PAD), not acute limb ischemia. The clinical picture shows:

• Chronic risk factors (diabetes, 40 pack-year smoking history)
• Physical findings consistent with chronic disease (diminished pulses, abdominal bruit)
• No mention of acute symptoms (sudden onset pain, rest pain, tissue loss)

The Appropriate Diagnostic Pathway

For chronic iliac artery disease, anatomic imaging (CT/MR angiography) is NOT urgently indicated and should only be performed when:

• Revascularization is being actively considered 1
• The patient has lifestyle-limiting claudication despite guideline-directed medical therapy (GDMT) 3
• There is critical limb-threatening ischemia 2

The 2024 ACC/AHA guidelines explicitly state that angiography should NOT be performed for anatomic assessment in patients with asymptomatic PAD 3, and the ACR Appropriateness Criteria emphasize that imaging is only indicated when findings would change management 1.

Why the Other Statements Are CORRECT

Statement A: ABI of 0.7 is Reduced ✓

• ABI ≤0.90 is abnormal 4
• Normal range is 1.00-1.40 4
• This patient's ABI of 0.7 confirms PAD diagnosis

Statement B: Common Stenosis Sites ✓

• Aortoiliac, femoropopliteal, and tibial segments are indeed the typical locations for atherosclerotic disease 5, 6

Statement C: Age of Manifestation ✓

• In non-diabetic, non-smoking individuals, PAD manifests later (typically after age 70)
• Diabetes and smoking are major risk factors that accelerate atherosclerosis 7, 8
• This patient at age 59 with both risk factors demonstrates the earlier presentation pattern

Statement E: First-Line Treatment ✓

Medical management is absolutely the cornerstone of initial therapy 1, 2:

• Smoking cessation (most critical)
• Antiplatelet therapy (aspirin or clopidogrel)
• Statin therapy (high-intensity for lipid lowering)
• Antihypertensive therapy (especially ACE inhibitors/ARBs)
• Structured exercise program (supervised when possible)
• Weight loss and lifestyle modification
• Diabetes control

Clinical Pitfall to Avoid

Do not order advanced imaging (CTA/MRA) reflexively when you diagnose PAD. The presence of diminished pulses and bruits establishes the diagnosis clinically, and ABI confirms it. Advanced anatomic imaging is reserved for revascularization planning, not diagnosis 1, 3.

The correct initial approach is:

1. Confirm diagnosis with ABI (already done: 0.7)
2. Initiate comprehensive medical therapy
3. Assess symptom severity and functional limitation
4. Only pursue anatomic imaging if revascularization becomes necessary due to lifestyle-limiting symptoms despite optimal medical therapy

Urgent imaging would only be indicated if this patient had acute limb ischemia (sudden onset pain, absent pulses, pallor, paresthesias, paralysis) 1, which is clearly not the case here.