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用CT诊断喉新生物是因为新生物所含组织比正常喉软组织的密度高和能使正常解剖结构发生失真、变位或破坏,对估计喉旁和会厌前间隙新生物尤其有价值,肿瘤向深部浸润常使该处正常低密度的脂肪组织消失,而会厌癌早期扩散至会厌前间隙经临床或喉照相均难以作出估计。 CT可准确估计肿瘤向后下扩展,甲状软骨和杓状软骨间肿瘤的扩展,甲状软骨下角和环状软骨间肿瘤的潜入,这在梨状窝部肿瘤中并不少见。肿瘤向深部扩展至前或后连合,用CT检查亦较可靠,用喉照相确定则有困难。CT能充分显示声门下肿瘤与环状软骨间的关系,这正是术者在确定手术范围时所需要,比从声带下缘向下粗略测定肿瘤的范围要重要。
Diagnosis of laryngeal neoplasms using CT is because the new organism contains higher density tissue than normal laryngeal soft tissue and can distort, dislocate, or destroy normal anatomical structures. This is especially valuable for estimating paranasal and epiglottic space neoplasms. Deep infiltration often leads to the disappearance of normal, low-density adipose tissue, and it is difficult to estimate clinically or laryngeal photography in the early spread of epiglottis to the epiglottis. CT can accurately estimate the backward expansion of the tumor, the expansion of tumors between the thyroid cartilage and the arytenoid cartilage, the penetration of the hypothyroid cartilage and the intercarpal tumor, which is not uncommon in the piriform tumor. Tumors expand deeper into the anterior or posterior commissures and are more reliable with CT scans. Difficulties can be identified with a laryngeal camera. CT can fully show the relationship between the subglottic tumor and the cricoid cartilage. This is exactly what the surgeon needs to determine the scope of the operation. It is more important than the rough measurement of the tumor from the lower edge of the vocal cord.