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外耳道恶性瘤为一较少见的病变,虽常为老年性病变,但亦可发生于青年人。此病常发于有慢性外耳道炎者。治疗能否成功,须具备以下四个因素:(1)早期诊断很重要;(2)对肿瘤范围的正确估计;(3)从而进行适当的手术;(4)对某些病人进行手术后放疗。发于外耳道软骨部或外耳道口的肿瘤,可直接经过软骨及其缝隙,扩展侵犯至腮腺。肿瘤发生于外耳骨部者,可透过鼓膜、鼓乳缝或向后经乳突松质骨扩展。如肿瘤已侵至乳突及中耳,即很易扩展到乳突的外围部。亦常侵犯到中或后颅窝硬脑膜,沿大血管或咽鼓管扩散。以上这些重
The malignant tumor of the external auditory canal is a rare lesion. Although it is often a senile lesion, it can also occur in young people. The disease often occurs in people with chronic otitis externa. The success of treatment requires the following four factors: (1) early diagnosis is important; (2) correct estimation of tumor size; (3) appropriate surgery; (4) postoperative radiotherapy for some patients . Tumors that develop in the cartilage of the external auditory canal or in the external auditory canal can pass directly through the cartilage and its crevices and extend into the parotid gland. Tumors occur in the external earbone and can spread through the tympanic membrane, tympanostomy, or posterior mastoid cancellous bone. If the tumor has invaded the mastoid and middle ear, it can easily spread to the outer part of the mastoid process. It also often invades the dura mater in the middle or posterior fossa and spreads along the great vessels or eustachian tube. Above these weights