Hereditary arachnoiditis is not a frequent type of arachnoiditis which occurs because of defects in the meninges that are genetics.
Neoplastic arachnoiditis is the type of arachnoiditis that is caused due to cancer.
Optochiasmatic arachnoiditis, on the other hand, is an arachnoiditis that occurs behind the optic nerve which can result in severe or complete vision loss.