How do PTFE dialysis grafts typically appear on ultrasound?

How do PTFE dialysis grafts typically appear on ultrasound?

• A. Single wall channel
• B. Diffuse hypoechoic mass
• C. Double wall appearance
• D. No characteristic appearance

Answer: (C)

PTFE dialysis grafts have a distinctive two-walled tubular appearance on gray-scale ultrasound. The prosthetic material forms two parallel, highly echogenic surfaces that outline a central lumen, producing a “double wall” or double-contour sign. This contrast between the bright outer and inner graft walls against a relatively darker lumen is characteristic of PTFE grafts, helping differentiate them from native vessels. When Doppler is used, you’ll see flow within that lumen, confirming patency. If the graft becomes stenotic or occluded, the lumen may narrow or show absent flow, but the basic double-wall configuration remains the hallmark finding.

PTFE dialysis grafts have a distinctive two-walled tubular appearance on gray-scale ultrasound. The prosthetic material forms two parallel, highly echogenic surfaces that outline a central lumen, producing a “double wall” or double-contour sign. This contrast between the bright outer and inner graft walls against a relatively darker lumen is characteristic of PTFE grafts, helping differentiate them from native vessels. When Doppler is used, you’ll see flow within that lumen, confirming patency. If the graft becomes stenotic or occluded, the lumen may narrow or show absent flow, but the basic double-wall configuration remains the hallmark finding.