Finitzo T, Pool K D, Freeman F J, Cannito M P, Schaefer S D, Ross E D, Devous M D
Arch Otolaryngol Head Neck Surg. 1987 Oct;113(10):1107-10. doi: 10.1001/archotol.1987.01860100085029.
Spasmodic dysphonia (SD) is a low-incidence voice disorder of unknown origin. A subgroup of seven patients with SD from our larger pool of 70 report vocal symptoms subsequent to head injury. This article is a case report of the neurodiagnostic findings, including computed tomography, magnetic resonance imaging, auditory brain-stem response, brain electrical activity mapping, and single photon emission computed tomography for three such patients. For each patient, two or more tests revealed positive neurologic findings. Each test, except computed tomography, demonstrated abnormalities in one or more patients. Two principles of clinical management are derived: (1) information regarding head trauma sustained before SD symptom onset is significant; (2) the absence of neuropathology on a single measure of central nervous system function should not be considered conclusive evidence that no neurologic lesions exist.
痉挛性发声障碍（SD）是一种病因不明的低发病率嗓音疾病。在我们70例患者的较大样本中，有7例SD患者报告在头部受伤后出现嗓音症状。本文是一篇病例报告，介绍了3例此类患者的神经诊断结果，包括计算机断层扫描、磁共振成像、听觉脑干反应、脑电活动图和单光子发射计算机断层扫描。对于每例患者，两项或更多项检查显示有阳性神经学发现。除计算机断层扫描外，每项检查在1例或更多例患者中显示异常。由此得出临床管理的两条原则：（1）SD症状出现前遭受头部创伤的信息很重要；（2）单一中枢神经系统功能测量未发现神经病理学改变，不应被视为不存在神经病变的确凿证据。
