Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Delayed contrast washout pattern. Preinjection (A), immediate postinjection (B), and delayed postinjection (C) images demonstrate intravascular contrast (arrows) that progressively washes out on delayed images. After needle repositioning (D), re-injection of contrast shows only epidural contrast spread.
