[A case of a spinal extradural arachnoid cyst causing unilateral quadriceps amyotrophy].
D001099:Arachnoid; D003560:Cysts / Q000150:complications*; D005260:Female; D006801:Humans; D008875:Middle Aged; D009133:Muscular Atrophy / Q000209:etiology*; D013118:Spinal Cord Diseases / Q000150:complications*; D013848:Thigh