正常和良性增生前列腺的高场强磁共振成像特征

Normal prostate and benign prostatic hyperplasia:MR imaging at 1.5T

目的总结正常前列腺的磁共振成像（ＭＲＩ）特征和随增龄的变化，探讨老年人良性前列腺增生的ＭＲＩ特征及其与临床的对应关系。方法结合３例尸体前列腺ＭＲＩ进行病理对照，分析２３例正常、５０例老年人良性增生前列腺的高场强ＭＲ成像。结果４０岁组至６０岁组的正常前列腺整体各径线以及内部各带径线均值差异无显著性，而Ⅰ、Ⅱ、Ⅲ度增生各组间各径线均值差异有显著性。前列腺每增大１度，其各径线均值增加５～８ｍｍ。结论正常前列腺，从４０岁组至６０岁组不随年龄增长而增大，临床分度与增生前列腺的大小相关，前列腺周围静脉丛与前列腺大小及年龄无关。并提供以下分度参考值：正常前列腺最大横径≤４５ｍｍ，而≥５５ｍｍ为Ⅲ度增生，横径在４６～５４ｍｍ之间为Ⅰ～Ⅱ度增生。

Objective To study normal prostate MR imaging and its age related changes as well as benign prostatic hyperplasia MR imaging correlated with clinical findings. \ \ Methods\ Based on a study through 1 5T MR imaging of 3 cadavers at the age of 72 to 91 with correlation of zonal anatomy and pathological changes,23 cases of normal prostate and 50 cases of benign prostatic hyperplasia.\ \ Results\ From fourth decade to sixth decade,the normal prostate had no significant change.From the first to third degree of hypertrophy,the diameters of prostate changed significantly increasing by 5 8mm per degree in average.\ \ Conclusions\ The diameter of normal prostate does not change significantly with increase of age.The degree of the benign prostatic hyperplasia is well correlated with the size of prostate.The periprostatic venous plexus does not change with aging or with the size of prostate. \ \