Paraneoplastic cerebellar degeneration

Paraneoplastic cerebellar degeneration is a condition in which an immune response mounted against a cancer is thought to cross-react with the cerebellum, the part of the brain that coordinates movement and balance, damaging its Purkinje cells. Specific antineuronal antibodies, most often anti-Yo, are frequently found, and the condition is most associated with ovarian, breast, and lung cancers, along with Hodgkin lymphoma, sometimes appearing before the underlying cancer is diagnosed. It is considered one of the more commonly recognized paraneoplastic neurological syndromes, though still rare overall.

Research estimates an age-standardized incidence of roughly 0.22 cases per 100,000 person-years. Onset is typically fairly rapid, unfolding over weeks, and can lead to significant unsteadiness and difficulty with coordination before it is recognized.

Common signs

Fairly rapid onset over weeks of unsteadiness and loss of coordination, difficulty walking, slurred speech, trouble with fine movements, dizziness, and abnormal eye movements.

This is a plain-language summary for orientation, not a diagnosis. Mechanisms are described as current understanding, not settled fact. Work with your own clinician for your care.