Estimation of canine prostatic volume: nomogram based on prostatic cubic volume.

To estimate prostate volume in canines, we demonstrated the nomogram based on prostatic cubic volume. Transrectal ultrasonography (TRUS) was performed in twenty beagle dogs. Prostatic length (L) and height (H) were determined on sagittal image, and prostatic width (W) was determined on transaxial image. Data of one dog, which had asymmetrical shaped prostate, were excluded from the analysis. Prostate volume was estimated by the following nomogram: Gravimetric prostatic volume (g) = 0.642 x prostatic cubic volume (cm3) + 1.84 (prostatic cubic volume = L x H x W cm3, r = 0.997, p<0.001). By substituting the prostatic height to the average of height, prostatic volume of one dog showing asymmetrical shape was successfully estimated. We also showed technical points in evaluating morphology of canine prostate on TRUS. In conclusion, this nomogram is of great use for directly estimating prostatic volume.