Paraneoplastic syndromes are a group of disorders that occur when the immune system's response to cancer inadvertently attacks normal tissues, including the nervous system. These syndromes can lead to a variety of neurological symptoms, including ataxia. Paraneoplastic cerebellar degeneration (PCD) is one such syndrome where the cerebellum, the part of the brain responsible for coordination, is targeted, leading to severe ataxia.
