[Simple calculation of prostatic weight with transrectal echography]

The appraisal of the prostate weight with transrectal ultrasound scanning is simplified with the use of a simple mathematical formula of an ovoid volume. Such a method does not prolong the examination time but provides an acceptable reliability, and therefore it can be used as a substitute to planimetry, more subject to the observer's error and more time consuming for the physician, even when part of the examination can be made by replaying the video.