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近年来,由于CT扫描技术的进步,给听神经瘤的诊断带来了飞跃的进展。但对于内耳道的以及向颅后凹仅侵蚀了数毫米的小肿瘤的诊断,即使采用最先进的造影剂对比CT法,也很难作出准确的诊断。作者们介绍气体CT脑池造影(注1)并用标线像法(target imaging)(注2)对诊断内耳道的和侵入颅后凹1.0cm左右的肿瘤是最有效的方法。文章指出,如果对比CT呈阴性反应,而临床方面很怀疑是听神经瘤时,就应该做空气CT脑池造影。作者们对在1971～1982年6月在庆应大学耳鼻喉科耳聋门诊接受诊断治疗,并经手术明确诊断为内耳道肿瘤11例和
In recent years, advances in CT scanning technology have brought about dramatic advances in the diagnosis of acoustic neuromas. However, for the diagnosis of small tumors that erode only a few millimeters into the inner ear canal and to the posterior cranial fossa, it is difficult to make accurate diagnosis even with the most advanced contrast contrast CT method. The authors introduced gas CT climatography (Note 1) and target imaging (Note 2) as the most effective method for diagnosing the internal ear canal and invading the posterior cranial concave about 1.0 cm. The article pointed out that if the contrast CT showed a negative reaction, and clinically suspected to be an acoustic neuroma, air CT cisternography should be done. The authors underwent diagnosis and treatment for ENT outpatients with deafness at Keio University from June 1971 to June 1982, and were confirmed by surgery as 11 cases of internal ear canal tumors.