Myelography involves injecting contrast media into which area?

• A. Subarachnoid space
• B. Intervertebral disc space
• C. Spinal cord/Epidural space
• D. Pleural cavity

Answer: (C)

The test is asking about where contrast media is placed to visualize the spinal canal. Myelography uses intrathecal injection into the subarachnoid space surrounding the spinal cord. Inside this space, the contrast mixes with cerebrospinal fluid and outlines the thecal sac, spinal cord, and nerve roots on radiographs or CT. This clearance lets you see compressions, herniations, or other lesions affecting the spinal canal. Injecting into the epidural space would not provide the same clear view of the intrathecal structures, and the other spaces mentioned (intervertebral disc space or pleural cavity) are unrelated to imaging the spinal canal contents.