青年男性前列腺前括约肌MRI解剖的研究

Normal Anatomy of Preprostatic Sphincter on MRI in Young Males

目的应用3.0T MR研究青年男性前列腺前括约肌的正常解剖形态。方法在仰卧位静息态,获取166名正常控尿的青年男性盆腔矢状面、冠状面和横截面的T2加权快速自旋回波图像,对前列腺前括约肌的矢状面、横断面、冠状面进行观察,正中矢状面影像上测量前列腺前括约肌与前列腺尿道纵轴所成的角。结果166例均获得诊断质量的T2加权图像。膀胱中层环形平滑肌形成前列腺前括约肌,自膀胱颈至精阜,前列腺前括约肌逐渐变薄,向前与前列腺前纤维肌肉基质相连续形成完整的环包绕尿道。正中矢状面前列腺前括约肌与前列腺尿道纵轴所成的角为19°~75°,平均33°,且随着年龄的增长角度增大。结论MRI能够清晰显示中国青年男性前列腺前括约肌的正常解剖形态。

Objective To study the normal anatomy of preprostatic sphincter in young males by using the 3.0T MR.Methods The sagittal,coronal,and axial T2-weighted non-fat suppressed fast spin-echo images of pelvic cavities of 166 young males were studied under resting in supine position.On midsagittal image,the angle which formed by the preprostatic sphincter and the sagittal line of the prostatic portion of urethra was measured.Results The T2 weighted images of diagnostic quality were obtained in all the 166 cases.The middle layer of bladder detrusor muscle formed the preprostatic sphincter.From bladder neck to verumontanum,the thickness of preprostatic sphincter was decreased gradually,and it formed a continuous structure with the anterior fibromuscular stroma of the prostate.On midsagittal image,the angle which formed by the preprostatic sphincter and the sagittal line of the prostatic portion of urethra varied from 19 to 75 degrees(mean,33 degrees),in addition,the angle increased with age.Conclusion The normal anatomy of preprostatic sphincter can be displayed on 3.0T MR in young males with no urinary control problems.