title: Is endorectal coil necessary for the staging of clinically localized prostate cancer? Comparison of non-endorectal versus endorectal MR imaging.
abstract: OBJECTIVE
  The goal of this study was to compare the diagnostic use and safety of endorectal coil (ERC) MRI with those of phased-array coil MRI.
  
  
  METHODS
  We retrospectively included 91 consecutive patients who had undergone 1.5-T MRI with ERC or with phased-array coil MRI before radical prostatectomy at our institution. We compared 47 patients' phased-array coil MRI and 44 patients' ERC-MRI with histologic findings. We also evaluated adverse events following the MRI procedure.
  
  
  RESULTS
  The serum PSA levels ranged from 2.85 to 33.51 ng/mL (10.72 ± 1.9), and the median Gleason score was 7 (range 4-9). The mean interval between diagnostic prostate biopsy and staging MRI was 18.4 days (range 2-37). In assessing organ-confined disease, extracapsular extension and seminal vesicle invasion by MRI, there were no significant differences between ERC-MR group and phased-array coil MR group. The AUC values were 0.671 (95% CI 0.530-0.813) for ERC-MR and 0.657 (95% CI 0.503-0.811) for phased-array coil MR. No significant differences were found between the two groups (p = 0.24). Five patients (11.4%) developed rectal complications after ERC-MRI. However, no complications were found in phased-array coil MRI group.
  
  
  CONCLUSIONS
  In terms of diagnostic accuracy and comfort of patients, the use of ERC-MRI did not significantly improve the staging of prostate cancer and presented several complications. Therefore, phased-array coil MRI is a better alternative considering comorbidity.
authors.affiliation: Department of Urology, Yonsei University Health System, Gangnam Severance Hospital, P.O. Box 1217, Seoul, Korea.
authors.forename: Seung Hwan
authors.initials: SH
authors.lastname: Lee
authors.forename: Kyung Kgi
authors.initials: KK
authors.lastname: Park
authors.forename: Kyung Hwa
authors.initials: KH
authors.lastname: Choi
authors.forename: Beom Jin
authors.initials: BJ
authors.lastname: Lim
authors.forename: Joo Hee
authors.initials: JH
authors.lastname: Kim
authors.forename: Seung Wook
authors.initials: SW
authors.lastname: Lee
authors.forename: Byung Ha
authors.initials: BH
authors.lastname: Chung
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000009:adverse effects / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging / Q000009:adverse effects / Q000379:methods*; D011237:Predictive Value of Tests; D017430:Prostate-Specific Antigen / Q000097:blood; D011471:Prostatic Neoplasms / Q000097:blood / Q000473:pathology*; D012189:Retrospective Studies; D012680:Sensitivity and Specificity
chemical_list: D017430:Prostate-Specific Antigen