The structural integrity of the posterior annulus fibrosus is compromised by repetitive microtrauma which will eventually lead to formation of fissures in the annulus fibrosus. This can be seen as an area of increased signal intensity on T2-weighted MRI imaging. The presence of a high-intensity zone is believed to be related to discogenic pain as it involves the outer, highly innervated layers of the annulus. Most patients are however asymptomatic while fissures close to the dorsal root ganglion are known to be most painful.