noun
olivopontocerebellar atrophy; OPCA
A rare neurodegenerative disorder characterized by atrophy of the cerebellum, pons, and inferior olives. Now often classified under multiple system atrophy (MSA).
See also: 多系統萎縮症
オリーブ橋小脳萎縮症は、小脳性運動失調を主症状とする疾患です。
Olivopontocerebellar atrophy is a disease whose main symptom is cerebellar ataxia.
Multiple system atrophy (MSA) is a broader category that now includes OPCA as one of its subtypes.
From the anatomical structures involved: オリーブ (olive, referring to the inferior olivary nucleus), 橋 (pons), 小脳 (cerebellum), and 萎縮症 (atrophy).