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MRI findings of radiation-induced changes in the urethra and periurethral tissues after treatment for prostate cancer.

Abstract：

PURPOSE:To assess radiotherapy (RT)-induced changes in the urethra and periurethral tissues after treatment for prostate cancer (PCa). METHODS AND MATERIALS:This retrospective study included 108 men (median age, 64 years; range, 43-87 years) who received external-beam radiotherapy (EBRT) and/or brachytherapy for PCa and underwent endorectal-coil MRI of the prostate within 180 days before RT and a median of 20 months (range, 2-62 months) after RT. On all MRIs, two readers independently measured the urethral length (UL) and graded the margin definition (MD) of the urethral wall and the signal intensities (SIs) of the urethral wall and pelvic muscles on 4-point scales. RESULTS:The mean urethral length decreased significantly from pre- to post-RT MRI (from 15.2 to 12.6mm and from 14.4 to 12.9 mm for readers 1 and 2, respectively; both p-values <0.0001). Brachytherapy resulted in greater urethral shortening than EBRT. After RT, SI in the urethral wall increased in 57% (62/108) and 35% (38/108) of patients (readers 1 and 2, respectively). The frequency and magnitude of SI increase in pelvic muscles depended on muscle location. In the obturator internus muscle, SI increased more often after EBRT than after brachytherapy, while in the periurethral levator ani muscle SI increased more often after brachytherapy than after EBRT. CONCLUSION:After RT for PCa, MRI shows urethral shortening and increased SI of the urethral wall and pelvic muscles in substantial percentages of patients.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Marigliano C,Donati OF,Vargas HA,Akin O,Goldman DA,Eastham JA,Zelefsky MJ,Hricak H

doi

10.1016/j.ejrad.2013.09.011

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

e775-81

issue

12

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(13)00509-3

journal_volume

82

pub_type

杂志文章

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