Although there is a diagnostic criterion for<unk> 's<unk> , one for<unk>  does not exist. Three diagnostic tools are mainly used. Blood test 60–70% of Japanese and Turkish patients were tested to possess HLA-B51, HLA-B serotype. These patients showed 6 times risk of getting BD. However, the same criteria are not ideal to be applied for<unk> peans because only 10–20% of<unk> pean patients showed to possess HLA-B51. Cerebrospinal fluid level Cerebrospinal fluid is a clear bodily fluid that occupies the subarachnoid space and the ventricular system around and inside the brain. It is revealed that 70–80% of Parenchymal<unk>  patients show altered CSF constituents. The observed different is 1) Elevated CSF protein concentration (1 g/dL), 2) Absence of oligoclonal band, and 3) elevated CSF cell count (0–400×106 cells/L) in the body. Others "...Despite its rarity, the patient's ethnic background and the typical radiographic findings should prompt the clinicians to include<unk>  in the differential diagnosis of optic<unk> tis and demyelinating<unk>  in the young..."5. This quote indicates that even common symptoms such as headache should be recognized as the sign for possible<unk>  considering the patient's ethnic background. Types There are two types of<unk> : parenchymal and non-parenchymal. The two types of<unk>  rarely occur in the same person. It is suggested that the pathogenesis of the two types are probably different.3 Statistics indicate that approximately 75% (772 of 1031) BD patients advanced to parenchymal<unk>  while 17.7% (183 of 1031) of BD patients advanced to non-parenchymal<unk> . The remaining 7.3% were not able to be categorized. Parenchymal If one experiences parenchymal<unk> , meningoencephalitis, inflammation of brain, primarily occurs. The target areas of parenchymal<unk>  include brainstem, spinal cord, and cerebral regions. Sometimes it is hard to determine the affected area because patients are asymptomatic. Non-parenchymal In non-parenchymal<unk> , vascular complications such as cerebral venous thrombosis primarily occurs. Other distinct characteristics include intracranial aneurysm and extracranial aneurysm. In most cases, veins are much more likely to be affected than arteries. Venous sinus thrombosis is the most frequent vascular manifestation in<unk>  followed by cortical cerebral veins thrombosis. On the other hand, thrombosis and aneurysms of the large cerebral arteries are rarely reported. Others Peripheral nervous system involvement is rarely reported (~0.8%). In this case, Guillain–Barré syndrome, sensorimotor<unk> pathy, mononeuritis multiplex, autonomic<unk> pathy, and subclinical nerve-conduction abnormalities are observed. Some of the syndromes are not common but recognized for the relation to<unk>  such as acute meningeal syndrome, tumor-like<unk> , psychiatric symptoms and optic<unk> pathy.
Neuro-Behçet's disease
Sever's disease
Chilaiditi syndrome
Bowel-associated dermatosis–arthritis syndrome
TRIANGLE disease
Swyer–James syndrome
Swaim's Panacea
Franceschetti–Klein syndrome