Final answer:
An intrathecal injection is associated with a myelogram, an imaging test used to visualize the spinal cord and related structures.
Step-by-step explanation:
An intrathecal injection is a procedure where medication is injected into the spinal canal, specifically into the space around the spinal cord known as the subarachnoid space. This procedure is associated with a diagnostic examination called a myelogram. A myelogram is an imaging test that uses a contrast dye and X-rays or CT scans to visualize the spinal cord, nerve roots, and spinal lining (meninges). It is particularly useful for detecting abnormalities such as herniated discs, tumors, or infections.