Ataxia

3 types of ataxia:
http://www.mult-sclerosis.org/ataxia.html

Cerebellar ataxia:
- ataxia may primarily involve the trunk (truncal ataxia) and the patient may not be able to sit or stand unsupported (astasia); truncal ataxia is usually due to midline cerebellar disease, and associated limb ataxia due to lateral cerebellar hemisphere disease may not be present

- incooordination of walking (gait ataxia) that is so severe that the patient cannot walk is called abasia, and the term astasia-abasia is used if the the patient's balance is so impaired that the patient cannot maintain his balance when either sitting or walking

- persistent incoordination of the truncal axial musculature may produce body tilts, pelvic tilts or head tilts