noun
primary lateral sclerosis; PLS
Medical term for a rare neurodegenerative disorder affecting upper motor neurons.
原発性側索硬化症は、上位運動ニューロンの変性を特徴とする疾患です。
Primary lateral sclerosis is a disease characterized by degeneration of upper motor neurons.
Compound of 原発性 (primary), 側索 (lateral funiculus), and 硬化症 (sclerosis). The term is a direct medical translation.