Sonoelastography of the prostate: comparison with systematic biopsy findings in 492 patients.
OBJECTIVE
The aim of this study was to assess the value of sonoelastography (SE) for prostate cancer detection in comparison with systematic biopsy findings.


METHODS
Four hundred and ninety two PSA screening volunteers (mean age: 61.9+/-8.6) with an total PSA >1.25 ng/mL and a free to total PSA ration of <18% underwent SE of the prostate before 10 core systematic prostate biopsy. Tissue elasticity of the peripheral zone was investigated only. Tissue elasticity was displayed from red (soft) to green (intermediate) and to blue (hard). Only hard lesions (blue) were considered to be suspicious for prostate cancer. The peripheral zone of the prostate was divided in 3 regions on each side: base, mid-gland, apex. A different investigator performed systematic biopsy, and the biopsy findings were compared with the SE findings.


RESULTS
In 125 of 492 patients (25.4%) systematic biopsy demonstrated prostate cancer. Cancer was detected in 321 of 2952 (11%) outer gland areas (74 in the base, 106 in the mid-gland, 141 in the apex). The Gleason score ranged from 3 to 10 (mean: 6.5). In SE 533 of 2952 (18.1%) suspicious areas were detected and 258 of these areas (48.4%) showed cancer. Most of the false-positive findings (275/533 areas; 51.6%) were associated with chronic inflammation and atrophy especially at the basal prostate areas. The sensitivity by entire organ was calculated with 86% and the specificity 72%. The analysis by outer gland areas showed the highest sensitivity in the apex (79%). The specificity by outer gland areas ranged between 85% and 93%. The correlation between SE findings and biopsy results was high (p<0.001).


CONCLUSIONS
Sonoelastography findings showed a good correlation with the systematic biopsy results. The best sensitivity and specificity was found in the apex region. Sonoelastography seems to offer a new approach for differentiation of tissue stiffness of the prostate and may therefore improve prostate cancer detection.
Pallwein
Leo
L
Department of Radiology 2/Uroradiology, Medical University Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria. leo.pallwein@i-med.ac.at
Mitterberger
Michael
M
Pinggera
Germar
G
Aigner
Friedrich
F
Pedross
Florian
F
Gradl
Johann
J
Pelzer
Alexandre
A
Bartsch
Georg
G
Frauscher
Ferdinand
F
D001706:Biopsy; D004548:Elasticity; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D017430:Prostate-Specific Antigen / Q000097:blood; D011471:Prostatic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D014463:Ultrasonography
D017430:Prostate-Specific Antigen