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Actas Urol Esp. 2006 Feb;30(2):175-80.

[Volume determinations of the whole prostate and of the adenoma by transrectal ultrasound: correlation with surgical specimen].

[Article in Spanish]

Author information

1
Servicio de Urología, Hospital General Universitario, Gregorio Marañón, Madrid. ramirocabello@telefonica.net

Abstract

OBJECTIVE:

We evaluated whether preoperative transrecta ultrasound (TRUS) mesaurements of the transition zone (TZ) and total prostate volumen predict real prostatic weight.

MATERIAL AND 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.

PMID:
16700208
[Indexed for MEDLINE]

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