前列腺癌和良性前列腺增生的MR影像表现——与组织病理对比研究

目的：了解磁共振成像在前列腺癌和良性前列腺增生诊断与鉴别诊断的价值。方法：本文对２１例有手术病理证实的前列腺癌和良性前列腺增生的病人进行ＭＲ检查，并与组织病理作对比研究。其中６例前列腺癌，２例前列腺肉瘤，１３例良性前列腺增生。采用自旋回波（ＳＥ）Ｔ１和Ｔ２加权像对所有病例进行分析。结果：ＭＲＴ２加权像５２％（１１／２１）的病人显示位于前列腺两侧及后部的边缘带腺体呈高信号，而中央带的腺体呈低信号。７６％（１０／１３）的良性前列腺增生显示为中央带腺体增大呈较低信号强度而两侧高信号的边缘带腺体呈压缩变薄的改变。在前列腺癌和肉瘤中７例表现为ＭＲＴ２加权像一侧或两侧的边缘带高信号消失，且周边不见低信号的纤维包膜。２１例前列腺增生与癌的诊断准确率为８０．９％。此外本文还对肿瘤外侵的估计作了初步探讨。结论：我们认为ＭＲ在前列腺增生和癌的诊断和鉴别诊断上有应用价值。

Prostatic Carcinoma and Benign Prostatic Hyperplasia:Correlation Study of MRI Appearance with Histopathological Result

Purpose:To evaluate the value of MR imaging in Diagnosing and Differentiate diagnosis of prostatic carcinoma and benign prostatic hyperplasia(BPH).Methods:21 patients with proved pathologically prostatic diseases were examined with MR imaging.They involved 6 prostatic carcinoma,2 proslalic sarcoma,13 BPH.Conventional spin echo T 1 weighted and T 2 weighted images in all cases were analysed.Result:Peripheral zonal of prostate were detected by MR imaging in 52%(11/21) of all cases.T 2 weighted images (long TR and TE) of spin echo sequence can demonstrate clearly peripheral and central zone of prostate.76%(10/13) of BPH showed a lower signa intensity in enlarge central zone than normal peripheral zone that was marked compression and thinning.7 malignant prostatic diseases showed a lower signal intensity in peripheral zone,which normal high signal intensity disappeared on T 2 weighted images,poor delineation between inner gland and the cancerous peripheral zone.All accuracy of diagnosis of prostatic diseases in this study was 80.9%.Conclusion:MR imaging is useful in diagnosing and differentiate diagnosis of prostatic carcinoma and prostatic benign hyperplasia.