Imaging recommendation · Vascular

Sciatic distribution claudication or buttock mass, suspected persistent sciatic artery

Q: What's the alternative imaging for sciatic distribution claudication or buttock mass, suspected persistent sciatic artery when surgical planning?

Catheter angiography (iv contrast).

Recommended: CTA / MRA Pelvis and Lower Extremity is the preferred imaging study for sciatic distribution claudication or buttock mass, suspected persistent sciatic artery. Persistence of embryologic sciatic artery; major arterial supply to leg instead of normal SFA / popliteal.

Recommended study

CTA / MRA Pelvis and Lower Extremity

CT IV contrast Preferred Vascular Outpatient Reviewed 2026-05

Persistence of embryologic sciatic artery; major arterial supply to leg instead of normal SFA / popliteal.

If the default doesn't apply

Surgical planning

Catheter angiography IV contrast

Watch-outs

Aneurysmal degeneration common

Up to 50% develop aneurysms with risk of rupture / thrombosis / embolization.

Cowie sign

Absent femoral pulse with strong popliteal pulse — classic.

Pearls

Complete (large) vs incomplete (small remnant) types.
Aneurysm typically at sciatic foramen.
Treatment: endovascular exclusion + extra-anatomic bypass.