先天性外耳道闭锁及其它异常的CT诊断

CT Scan for Diagnosis of Congenital Atresia of the External Auditory Canal and Other Associated Abnormalities of the Affected Ear

目的通过对12例先天性外耳道病人的CT扫描分析,为临床治疗提供可靠的影像依据。方法回顾性地分析先天性外耳道闭锁的患儿12例,男9例,女3例。平均年龄22个月(1个月至6岁)。采用全身螺旋CT扫描机扫描整个颞骨。层厚1mm,层间距1mm。结果CT证实外耳道闭锁14耳,外耳道以骨样密度组织代之,1cm以上厚度3耳,小于1cm厚度4耳;外耳道呈线样狭窄5耳;无骨样组织仅为软组织密度1耳;外耳道前壁缺如1耳;同时伴随中耳结构的异常,如中耳鼓室狭小变形10耳;上鼓室变形5耳;锤砧骨发育小且形态异常8耳等,内耳结构均未见明显异常。结论HRCT能准确显示先天性外耳、中耳、内耳畸形的类型和程度。为临床治疗方案地正确制定提供重要的参考依据。

Objective To analyze the CT scan signs of the congenital abnormalities of the external auditory canal of 12 patients, providing the credible results of images for clinic treatment. Methods The CT scan signs of the affected ears of 12 patients（9 boys and 3 girls） were retrospectively analyzed. The mean ages was 22 months（range 1 month-6 years）. CT scans were taken by a systemic spiral CT machine for entire temperal bones of the affected sides. The layer thickness of the scan was 1 mm and the interval length between the two successive layers was also lmm. Results Forteen ears of congenital atresia of external auditory canal were approved by CT scan and 7 canals were replaced by bony masses（thickness〉1 mm in 3 ears and 〈1 mm in 4 ears）. Thread-like stenosis was found in 5 ears. Canals were blocked by soft tissue in 1 ear and anterior wall defect of the canal in 1 ear. The associated abnormalities of the middle ear,such as following.stricture of tympanic cavity in 10 ears, deformity of atticus in 5 ears and small size with abnormal shape of malleus and incus in 8 ears were also delineated. No obvious abnormality was found in inner ear. Conclusion HRCT could demonstrate patterns and severity accurately, which has already become a indispensable imaging modality for microscopical operation of otology.