Which of the following is the diagnostic test that involves injection of a contrast medium directly into the common bile duct or through a T tube?

Question

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Cholangiography is the diagnostic test that involves injection of a contrast medium directly into the common bile duct or through a T tube. This allows for visualization and evaluation of the biliary drainage system, including the bile ducts and gallbladder. CT scan, cholecystography, and gallbladder ultrasound do not involve direct injection of contrast medium into the bile ducts. Renal angiography is a diagnostic test for visualizing blood flow to the kidneys.

Which of the Following Is the Diagnostic Test That Involves