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Non-atherosclerotic arteriopathies — Buerger disease, popliteal entrapment and cystic adventitial disease
Claudication or ischaemia in a young patient without atherosclerotic risk factors calls for a non-atherosclerotic disease: Buerger (young smoker, small arteries of hands and feet, the only effective treatment — complete smoking cessation), popliteal artery entrapment (young athlete, pulse disappearing with plantar flexion), and cystic adventitial disease (young man, a cyst in the popliteal artery wall).
Why it matters in the exam
Buerger disease (thromboangiitis obliterans) is an inflammation causing occlusion of small and medium arteries and veins, mainly in male smokers under age 45 — including cannabis smokers. It presents with foot or calf claudication, rest pain, ulcers and gangrene of fingers and toes, Raynaud phenomenon and migratory superficial thrombophlebitis. Angiography shows abrupt occlusions of distal arteries with "corkscrew collaterals", without atherosclerosis in the proximal arteries. The only treatment that changes the course of the disease is complete smoking cessation, including all tobacco and nicotine products; without it the risk of amputation is high. Revascularisation is difficult because of the distal disease, and iloprost helps pain and healing. Other causes must be excluded: connective tissue diseases, thrombophilia, cardiac emboli and diabetes.
Popliteal artery entrapment results from an abnormal anatomical relation between the artery and the medial head of the gastrocnemius muscle; it appears in a young athlete with calf claudication. On examination the foot pulse weakens or disappears with active plantar flexion or passive dorsiflexion. Diagnosis is by duplex with provocation positions and MRI or CTA. Treatment is surgical — releasing the artery and dividing the entrapping muscle, and a short bypass if the artery is already damaged — because stenosis, aneurysm or thrombosis develop over time. Cystic adventitial disease appears in a young man with claudication, usually in the popliteal artery; a mucin-filled cyst in the wall compresses the lumen and appears on angiography as a "scimitar" (scimitar sign). Treatment is cyst excision or resection of the arterial segment with a vein graft — not balloon angioplasty, which fails. A further condition is external iliac artery endofibrosis in competitive cyclists.
Takayasu arteritis and other vasculitides, as well as FMD, are separate topics, but they too belong in the differential diagnosis of claudication in a young patient.
Key points
- Buerger — young smoker, distal arteries, smoking cessation.
- Corkscrew collaterals on angiography.
- Entrapment — athlete, pulse disappears with flexion.
- Cystic disease — scimitar sign, excision.
- Young patient with claudication — think beyond atherosclerosis.
Summary table
| Disease | Typical patient | Key finding | Treatment |
|---|---|---|---|
| Buerger | Male smoker under 45 | Distal occlusions, corkscrew, migratory phlebitis | Complete smoking cessation; iloprost |
| Popliteal artery entrapment | Young athlete | Pulse disappears with plantar flexion | Surgical release and sometimes bypass |
| Cystic adventitial disease | Young man | Wall cyst, scimitar sign | Cyst or segment excision with vein |
| External iliac endofibrosis | Competitive cyclist | Thigh claudication at high exertion | Surgery in selected patients |
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Sources
- ESC Guidelines for the management of peripheral arterial and aortic diseases, 2024 — Non-atherosclerotic causes of limb ischaemia
- Rutherford's Vascular Surgery and Endovascular Therapy, 10th edition (2022) — Thromboangiitis obliterans and popliteal artery entrapment
- Olin, Thromboangiitis obliterans (Buerger's disease), N Engl J Med, 2000 — Diagnosis and treatment
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.