[Calculation of prostatic volume by endorectal ultrasonography. A formula of surgical observation].
This study compares ultrasonographic prediction of prostatic volume and surgical exerese. A total of 200 prostates have been measured by the same echographist, operated upon by the same surgeon, and stratified for histology, surgical technique and weight. Adopting the general formula: Surgical volume = D1 x D2 x D3/x the surgical volume is calculated by a simplified and complete definition for a denominator giving the most accurate prediction.


CONCLUSIONS
a. the glands of more than 60 cc could be calculated by the classical formula of ellipsoid pi x D1 x D2 x D3/6, simplified to D1 x D2 x D3/2, with a 21% standard deviation error from the surgical volume; b. medium-sized prostates (20-60 cc) could be calculated by the formula: D1 x D2 x D3/3 with a 21% standard deviation; c. prostates smaller than 20 cc, a series which included all reoperations for remnants or recurrence, could be calculated with the same proposed formula with a 22% standard deviation, while the classical ellipsoid formula led to a 56% standard deviation error. No mathematical formula based only on three prostatic diameters is reliable to assess true parenchymal weight.
Monseur
J
J
Service d'Urologie, Polyclinique du Parc, Caen.
Malherbe
F
F
D006801:Humans; D008297:Male; D009929:Organ Size; D011467:Prostate / Q000000981:diagnostic imaging* / Q000503:physiopathology; D011469:Prostatic Diseases / Q000503:physiopathology / Q000601:surgery; D011471:Prostatic Neoplasms / Q000503:physiopathology / Q000601:surgery; D014463:Ultrasonography
Calcul du volume prostatique par échographie endorectale. Une formule plus proche de l'observation chirurgicale.