横贯性脊髓炎是头颈部恶性肿瘤放射治疗后所产生的一种严重的、不可逆的、致死性的并发症,耳科医师在对待接受过放疗的病人时,应熟悉这种情况。放射治疗引起的脊髓损伤有二类:(1)急性放射性横贯性脊髓炎,一般在放疗后2～4月出现,是一种暂时的自限性脊髓病,可以完全恢复,发病与放疗剂量无关,主要病变为脱髓鞘改变。症状是主观的下腰区和下肢疼痛及感觉异常,颈部弯曲可引出或加重症状,是为Lhermitte征。(2)慢性者一般在治疗后12～18月出现,亦有早至6个月、迟至3年发生者。是进行 Transsexual myelitis is a serious, irreversible, lethal complication of radiotherapy of head and neck cancer that should be familiar to otologists when treating patients who have received radiotherapy. There are two types of spinal cord injury caused by radiation therapy: (1) Acute radiation transversity myelitis usually occurs after 2 ~ 4 months after radiotherapy. It is a temporary self-limiting myelopathy that can be completely recovered with no relation to the dose of radiotherapy , The main lesion is demyelinating changes. Symptoms are subjective lower back and lower extremity pain and sensory abnormalities, neck flexion can lead to or aggravate the symptoms, is for the Lhermitte sign. (2) Chronic persons generally appear after 12 to 18 months of treatment, as early as 6 months, as late as 3 years. Is carried out