[名词解释] Froin征

脊髓出血的最常见病因是() ["A．血液病","B．脊髓炎","C．脊髓外伤","D．脊髓肿瘤","E．变性病"] 椎管内肿瘤 Brown-Sequard’s syndrome 马尾综合征 蛋白细胞分离现象 Froin征