Abiotrophy means the loss of a vital nutritive factor. The exact cause of cerebellar abiotrophy is not known, but it is thought to be due to an intrinsic metabolic defect.

• 活力缺失指重要营养因子的缺乏。该疾病确切地病因不明，但人们认为可能是内在代谢缺陷所造成的。