<unk>  is a traditional medical diagnosis that is not utilized frequently in modern medicine. It is a complex combination of symptoms, amounting to a headache<unk> , that was originally hypothesized to be due to cervical spondylosis. Damage to the posterior cervical sympathetic chain due to the degeneration of the cervical vertebra was theorized to play a role in this<unk>  by the prolapsing of disc in the mid-cervical spine. However, the medical theory as was originally postulated was found to contain inconsistencies.<unk>  is regarded by many current medical researchers as synonymous with cervicogenic headache. Thus, the original works of<unk>  and<unk>  were foundational in identifying a crucial feature that distinguishes cervicogenic headache from other headache<unk> s—the concept that the pain originates from a structural abnormality in the cervical spine.
Barré–Liéou syndrome
Bickerstaff brainstem encephalitis
Marburg acute multiple sclerosis
Neu–Laxova syndrome
Rasmussen's encephalitis
Saint Louis encephalitis
La Crosse encephalitis
Hashimoto's encephalopathy