肺癌薄层CT增强扫描与病理对照的初步研究

目的 定量对比分析周围型肺癌和肺炎性假瘤、肺结核球的CT强化程度和病灶内血管的关系,探讨肺癌病灶内血管结构对其CT强化水平的影响。方法 以薄层CT扫描研究肺癌、肺炎性假瘤和肺结核球强化后的平均CT增值;用电脑图像分析仪计量病灶内小血管数（内径0.02-0.1mm)、较大血管数（内径＞0.1mm)及其血管床总面积,以统计学处理其CT增值与血管计数、血管床面积的相关性。结果 （1）增强扫描后,病灶的平均CT增值在肺癌、肺炎性假瘤和肺结核球间差异有显著性（P＜0．05）;（2）小血管数、较大血管数及血管床面积在三种病变间差异有显著性（P＜0．05）;（3）肺癌CT增值与小血管数和较大血管数具有相关性,且与小血管数相关性较大;（4）三种病变CT增值与较大血管数、血管总数及血管床面积具有相关性。结论 （1）CT强化程度的分组,对肺癌与肺炎性假瘤、肺结核球的鉴别诊断有一定意义;（2）肺癌与肺炎性假瘤、肺结核球的平均CT增值与病灶内的血管数和血管床面积呈正相关;（3）肺癌病灶CT增值可反映癌灶内血管性状及其血供情况。

Comparison of enhanced thin CT sections with pathologic findings in pulmonary carcinoma,inflammatory, pseudo-tumor and pulmonary tuberculoma

OBJECTIVE: To compare quantitatively the enhanced thin CT section with pathologic findings in pulmonary carcinoma, pulmonary inflammatory pseudotumor (IPT) and pulmonary tuberculoma so as to demonstrate the relation of degree of enhancement and the vascular structure within the lesion with special emphasis on pulmonary carcinoma. METHODS: Enhanced thin CT sections were obtained in 35 cases with nodular or patchy lesions in the peripheral lung field which are difficult to differentiate clinically. There were pulmonary carcinoma 21, inflammatory pseudotumor 7 and tuberculoma 7. The number of small vessels (inner diameter 0.02 approximately 0.1 mm), relatively large vessels (inner diameter > 0.1 mm) and their vascular bed areas were analyzed by computed image analyzing system. The relation between CT average attenuation and the number of vessels or the vascular bed areas were statistically evaluated. RESULTS: 1. The differences of average attenuation in carcinoma, inflammatory pseudotumor and tuberculoma were statistically significant (P < 0.05). 2. The differences in number of small vessels, relatively large vessels and vascular bed areas among these three types of lesion were also significant (P < 0.05). 3. A positive correlation was found in the average CT affenuation of lung carcinoma and its number of small vessels and relatively large vessels and 4. A positive correlation was found between the average CT attenuation in these three lesions and the relatively large vessels, total vascular amount and vascular bed areas. CONCLUSIONS: 1. The average degree of attenuation, being divided into four degrees, is of practical value in the differentiation of lung carcinoma, inflammatory pseudotumor and tuberculoma. 2. The average CT attenuation of lung carcinoma, inflammatory pseudotumor and tuberculoma is in direct proportion to the number of vessels and vessel bed areas and 3. The characteristic CT enhancement in lung carcinoma reflexes the condition of vessels and blood supply within the tumor.