Researchers do not fully understand what causes<unk> , although it is thought it could be due to a combination of environmental and genetic factors. Studies are being done to evaluate the possible causes, although linking causality can be difficult due to the relatively low number of people who are diagnosed with<unk> . Juvenile<unk>  may be caused by the ALS2 gene, although this condition is very rare.
Primary lateral sclerosis
Juvenile primary lateral sclerosis
Amyotrophic lateral sclerosis
Surfer's myelopathy
Vascular myelopathy
CMV polyradiculomyelopathy
Tumefactive multiple sclerosis
Multiple sclerosis