Alireza Ghadiri - Department of Clinical Sciences, School of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Reza Avizeh - Department of Clinical Sciences, School of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Ali Baniadam - Department of Clinical Sciences, School of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Amin Ranjbar - Graudated from School of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

Objective- To compare transabdominal (TA) and transrectal (TR) ultrasonography of the prostate gland. Design- Experimental study. Animals- ۱۰ intact male dogs that required euthanasia for reasons other than prostatic disease. Procedures- Prostatic length (L), width (W) and height (H) were measured in T A (L۱, W۱ and H۱) and TR (L۲ and H۲) ultrasonography. Prostatic volume was calculated using the formula for the volume of an ellipsoid (VE۱ and VE۲) or for a box (VB۱ and VB۲) in TA and TR procedures, respectively. The dogs were euthanized, the prostate gland removed, and actual prostate dimensions and volume were measured. Linear regression was used to compare prostatic dimensions and volume measured by ultrasonography to actual ones. Results- In TR ultrasonography there was no damage to rectum, the time for evaluation of the prostate gland was faster and the resolution of prostatic images was better than other procedure. There was highly significant correlation between prostatic parameters and their actual dimension. VB۱, VE۱ and VB۲ were greater and VE۲ were lesser than actual prostatic volume. In TR and TA methods the dimensions had significant correlation with real prostatic sizes, while had not significant statistical differences with real prostatic sizes. Conclusions and Clinical Relevance - TR ultrasonography found to be a simple, quick and noninvasive method and TA ultrasonography also yields useful information about the prostate. Calculated prostatic volume doesn't estimated prostatic volume correctly and need to use equations produced by linear regression:        V = ۰.۴۲۷ VB۱ – ۰.۸۸.                                                      V = ۰.۷۹۶ VE۱ – ۰.۴۰.        V = ۰.۶۸۰ VB۲ – ۱.۹۵.                                                      V = ۰.۹۸۰ VE۲ + ۱.۹۴.

Transrectal ultrasonography, Prostate gland, Dog