Beatriz Zudaire MD, Presenter: Nothing to Disclose

Maria Lourdes Diaz MD, Abstract Co-Author: Nothing to Disclose

Anibal Rincon, Abstract Co-Author: Nothing to Disclose

Carmen Blanca Hernandez-Sastre, Abstract Co-Author: Nothing to Disclose

Alberto Benito MD, Abstract Co-Author: Nothing to Disclose

Juan Javier Zudaire, Abstract Co-Author: Nothing to Disclose

To evaluate the need for endorectal coil in the staging of prostate cancer

Retrospective study between September 2000 and February 2004 of 179 patients diagnosed of T1-2 stage prostate cancer (TNM 2002) treated with radical prostatectomy who underwent prostate MRI prior surgery. MRI was performed with 1,5T equipment (Symphony, Siemens Erlangen, Germany). Endorectal coil as well as surface coil were employed in 77 patients (43%). In 102 patients (57%) MRI was performed only with a pelvic surface coil. On MRI extracapsular involvement, fat infiltration, seminal vesicle involvement, asymmetric thickening of the neurovascular bundle and the presence of adenopathies were evaluated and compared with histopathological findings. Sensibility (S), specificity (E), positive predictive value (PPV) and negative predictive values (NPV) were calculated.  

Extracapsular involvement detection: Endorectal coil: S 50%, E: 91,5%, PPV:64,3%; NPV:85,7% Pelvic surface coil: S:51,6%; E:88,7%;PPV:66,7%; NPV: 80,8% Seminal vesicle involvement: Endorectal coil: S:37,5%; E:91,3%;PPV:33,3%; NPV: 92,6% Pelvic surface coil: S:50%; E:95,7%;PPV:55,6%; NPV: 94,6% Correct staging: Endorectal coil: S:60%; E:84,2%;PPV:57%; NPV: 85,7% Pelvic surface coil: S:57,5%; E:89,9%;PPV:73%; NPV: 81,6%

Better specificities were found with the pelvic surface coil however, lower sensibilities were found in this group. With regards to extracapsular tissues pelvic surface coil increases sensibility but reduces specificity. For seminal vesicle involvement, pelvic surface coil improves all parameters.

The use of pelvic surface coils has a similar value as the use of endorectal coil MRI for the staging of prostate cancer.

Zudaire, B, Diaz, M, Rincon, A, Hernandez-Sastre, C, Benito, A, Zudaire, J, MRI of Localized Prostate Cancer: Are Endorectal Coils Necessary?.  Radiological Society of North America 2008 Scientific Assembly and Annual Meeting, February 18 - February 20, 2008 ,Chicago IL. http://archive.rsna.org/2008/6021955.html