Which of the following is NOT an indication for discography?

Discography is a diagnostic procedure used to identify discogenic pain by injecting a contrast agent into the intervertebral disc, which helps to assess the integrity of the disc and its potential role in a patient's pain. Among the given options, identifying severe spinal stenosis as a non-indication for discography is correct because discography is typically not utilized in the setting of significant spinal stenosis.

In the context of severe spinal stenosis, the underlying problem is often related to compressive neurologic issues rather than the intervertebral discs themselves. This means that addressing the disc issues through discography would not resolve the core problem of stenosis and could potentially exacerbate the patient's condition or lead to unnecessary complications.

In contrast, the other scenarios described—such as pain that is unresponsive to conservative treatment, the absence of visible disc herniation or evidence from non-invasive tests, and significant discogenic pain that may warrant surgical intervention—reflect situations where discography can provide valuable diagnostic insights. These clinical scenarios involve further exploration of the discs to determine if they are the source of pain, aiding in treatment planning and management decisions for the patient.