[Diagnosis of the "valve effect" of the middle lobe of prostate in benign prostatic hyperplasia and choice of the treatment method].

As there are still no accurate criteria of assessing middle-lobe prostatic benign hyperplasia contribution through the "valve effect" to development of infravesical obstruction, the authors propose to introduce "miction" transrectal ultrasonic study. This study provides evidence allowing to divide patients with middle-lobe prostatic benign hyperplasia into three groups by the degree of the "valve effect". This enables differential approach to choice of the scope of the operative intervention.