Abstract

CABELLO BENAVENTE, R. et al. Volume determinations of the whole prostate and of the adenoma by transrectal ultrasound. Actas Urol Esp [online]. 2006, vol.30, n.2, pp.175-180. ISSN 0210-4806.

Objective: We evaluated whether preoperative transrecta ultrasound (TRUS) mesaurements of the transition zone (TZ) and total prostate volumen predict real prostatic weight. Material y Methods: We compare estimated TRUS volumes with surgical specimen weight, in surgically treated patients with localized prostate cancer (group A, n=33) or benign prostatic hyperplasia (group B, n=37). The volume was calculated by the ellipsoid formula. Both measurements were compared with surgical specimen weight, assuming 1 as specific prostate weight. Results: Group A: mean prostate measured volume was 38,6 cc. (SD 22,7), mean RP specimen weight was 54,2 g (SD 27,2) (p=0,001). Total estimated prostate volume underestimated prostatectomy specimen weight by 29%. In order to adequate the estimated volume to the specimen weight, we calculated the formula: estimated prostate weight=0,95 x prostatic measured volume + 17,657 (p=0,005). Group B: mean TZ measured volume was 62,8 cc. (SD 23,3), mean adenomectomy specimen weight was 79,9 g (SD 45,9) (p=0,001). TZ estimated volume underestimated adenomectomy specimen weight by 21%. In order to adequate the estimated volume to the specimen weight, we calculated the formula: estimated TZ weight=1,67 x TZ measured volume - 24,768 (p=0,04). Conclusions: We found significative differences between TRUS measured volumes and real weight of surgical specimen. These differences could be corrected by simple formulas that allow to minimize the observed underestimations.

Keywords : Transrectal ultrasound; Prostate; Prostatic hyperplasia; Cancer of the prostate.

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