Brill Symmers Disease, often referred to as BSD, is an extremely rare and devastating neurological disorder. This condition primarily affects the brain, causing various cognitive and motor impairments. While there are currently no known synonyms specifically for BSD, the medical community often uses terms like Progressive Early-Onset Cerebral Degeneration or Early-Onset Degenerative Brain Disease as alternative expressions. These phrases better encapsulate the nature of the condition, highlighting its progressive and degenerative characteristics. Furthermore, medical professionals may utilize neurological terminology to describe the specific symptoms or manifestations associated with the disease, such as cognitive decline, motor dysfunction, or cerebral degeneration.