How are cerebellar degeneration, cerebellar ataxia and paraneoplastic cerebellar related?

Ataxia: Cerebellar degneration means that the part of the brain that controlls coordination and balance is losing cells and likely getting smaller. Ataxia is the clumsiness, imbalance, slurred speech and/or abnormal eye movements that can accompany cerebellar degeneration. A paraneoplastic cerebellar syndrome is when the body's immune response to cancer somewhere else damages the cerebellum "by mistake".