成年男性直肠系膜的螺旋CT测量

Measurement of male adults' mesorectum by spiral computed tomography

目的:探讨成年男性直肠系膜在螺旋CT上的形态学特征。方法:对29名成年男性进行盆腔横断面螺旋CT扫描,观察其形态学特征,测量不同平面厚度,分析直肠系膜厚度与体质量指数的关系。结果:直肠系膜在螺旋CT上显示清晰,上中部直肠系膜形状无明显改变,在下部前列腺水平后外侧明显变薄。直肠系膜前方、侧方和后方分别为(2.4±0.9)、(13.0±3.3)和(7.2±2.9)mm,差异有统计学意义,F=178.56,P=0.000。直肠系膜上、中、下平面厚度比较,差异有统计学意义,F=211.46,P=0.000,两两比较显示,上、中平面直肠系膜厚度差异无统计学意义,q=0.300,P=0.204,上与下、中与下平面直肠系膜厚度差异有统计学意义,q=4.300,P=0.000;q=4.000,P=0.000。直肠系膜侧方、后方厚度与体质量指数存在线性正相关,r=0.913,■=-12.635+1.080x,P=0.000;r=0.828,■=-13.716+0.881x,P=0.000。结论:直肠系膜具有特有的螺旋CT形态学特征,可为直肠癌的CT术前影像学分期提供依据。

OBJECTIVE： To study the modality of male adults＇ mesorectum by spiral computed tomography. METHODS： Twenty-nine male adults were scaned by spiral computed tomography to measure the thickness of the mesorectum at the three different planes, and the relation between the thickness and body mass index （BMI） was analyzed. RESULTS：The mesorectum was well displayed on the spiral computed tomography. The shape of the upper part of mesorectum was similar to the middle part, but at the level of prostate, the lateral and posterior parts became more and more thinner. The anterior part of the mesorectum was the thinnest [（ 2.4 ± 0.9） mm], the posterior part [（7.2± 2.9） mm] was thicker than the anterior part, and the lateral part [（13.0±3.3） mm] was the thickest, F=178.56, P= 0. 000. There was a difference among the thickness of the three planes, F=211.46, P=0. 000. The thickness of mesorectum was not different between the upper plane and the middle plane, q=0. 300, P= 0. 204, but the thickness of mesorectum of the low plane was thinner than that of the upper and middle planes, q= 4. 300, P=0. 000; q= 4. 000, P=0. 000. There was a positive linear correlation between the thickness of the lateral and posterior mesorectum and BMI, r= 0. 913, y^^=-12.635＋1.080x, P=0.000; r=0.828,y^^=-13.716 ＋ 0. 881x, P=0. 000. CONCLUSION：The special character istics of the mesorectum are well displayed by spiral computed tomography, and it could be beneficial for the staging of the rectal carcinoma.