Yonsei Med J.  2012 May;53(3):550-556. 10.3349/ymj.2012.53.3.550.

Comparison of Pelvic Phased-Array versus Endorectal Coil Magnetic Resonance Imaging at 3 Tesla for Local Staging of Prostate Cancer

• Kim BS
• Kim TH
• Kwon TG
• Yoo ES

• KMID: 1776990
• DOI: http://doi.org/10.3349/ymj.2012.53.3.550

Abstract

PURPOSE
Several studies have demonstrated the superiority of endorectal coil magnetic resonance imaging (MRI) over pelvic phased-array coil MRI at 1.5 Tesla for local staging of prostate cancer. However, few have studied which evaluation is more accurate at 3 Tesla MRI. In this study, we compared the accuracy of local staging of prostate cancer using pelvic phased-array coil or endorectal coil MRI at 3 Tesla.
MATERIALS AND METHODS
Between January 2005 and May 2010, 151 patients underwent radical prostatectomy. All patients were evaluated with either pelvic phased-array coil or endorectal coil prostate MRI prior to surgery (63 endorectal coils and 88 pelvic phased-array coils). Tumor stage based on MRI was compared with pathologic stage. We calculated the specificity, sensitivity and accuracy of each group in the evaluation of extracapsular extension and seminal vesicle invasion.
RESULTS
Both endorectal coil and pelvic phased-array coil MRI achieved high specificity, low sensitivity and moderate accuracy for the detection of extracapsular extension and seminal vesicle invasion. There were statistically no differences in specificity, sensitivity and accuracy between the two groups.
CONCLUSION
Overall staging accuracy, sensitivity and specificity were not significantly different between endorectal coil and pelvic phased-array coil MRI.

Keyword

Prostatic neoplasms; magnetic resonance imaging; neoplasm staging; comparative study

MeSH Terms

Aged
Humans
Magnetic Resonance Imaging/*methods
Male
Middle Aged
Prostatectomy
Prostatic Neoplasms/*diagnosis/surgery
Sensitivity and Specificity

Figure

• 

  Fig. 1 Comparison of a T2-weighted fast spin-echo magnetic resonance image at 3 Tesla and a corresponding axial whole-mount-section histopathologic slice (A) example of a tumor with a 2-mm radial distance of extracapsular extension (arrow) (prostate-specific antigen level, 7.8 ng/mL; final Gleason score, 3+4; stage, pT3a) that was detected with ERC MRI in a 61-year-old man, and histopathologic examination confirmed the presence of extracapsular entension at the left lateral side (circle) (B) example of a tumor with a 8-mm radial distance of extracapsular extension (arrow) (prostate-specific antigen level, 10.6 ng/mL; final Gleason score, 4+3; stage, pT3a) that was detected with PAC MRI in a 64-year-old man, and histopathologic examination confirmed the presence of extracapsular entension at the right dorsal side (circle). ERC, endorectal coil; PAC, phased-array coil; MRI, magnetic resonance imaging.

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