Endoscopic retrograde
内镜下逆行cholangiopancreatography (ERCP)
释义：retro "backward, reverse" (see retro-) + gradi "to go, step" (from PIE root *ghredh- "to walk, go")
A technique for viewing the pancreatic and bile ducts and for performing certain techniques to relieve obstructions; contrast medium is injected into the biliary system from the duodenum before radiographs are taken (see FIG. 13-16)