What ultrasound sign most directly indicates an intact silicone implant margin?

• A. Double Echogenic Margin
• B. Single Echogenic Line
• C. Posterior Acoustic Enhancement Within The Implant
• D. Peri-Implant Lucency

Answer: (A)

When evaluating silicone breast implants with ultrasound, the most direct indication that the implant margin is intact is a double echogenic margin. Seeing two parallel bright lines outlining the implant shell means the anterior and posterior surfaces of the shell are clearly visualized, confirming the shell remains continuous. The interior fill (the silicone gel) is within those boundaries and does not disrupt the appearance of the margins when the implant is intact.

If the implant were ruptured, that smooth, continuous double-line outline would become irregular or interrupted. You might also see signs like silicone in the surrounding tissues or a collapsed shell on advanced imaging, which indicate a breach rather than an intact margin. The other options describe findings that are either not specific to an intact margin (such as a single line, which doesn’t confirm both surfaces) or pertain to phenomena not directly about margin integrity (like posterior enhancement within the implant or peri-implant lucency, which can reflect other issues).

So, the double echogenic margin best and most directly signals that the silicone implant margin is intact.