http://www.ncbi.nlm.nih.gov/pubmed/23685183
Interesting article that shows that there are objective differences in the MRI images of classic TN, trigeminal neuropathy (sometimes called atypical TN, atypical facial pain, trigeminal neuropathic pain, etc) and painful temporomandibular disorders.
Hopefully something like this can become refined and used as a diagnostic tool. It's interesting that classic TN shows a marked difference from trigeminal neuropathy. This means that the two conditions should not be treated the same way, especially for surgical treatments. We all know that surgeries for classic TN often do not work or worsen the atypical cases.
Thoughts?