In BPH most common lobe involved is -

Anatomical division of Prostate Prostate has 5 lobes : Anterior lobe is a small isthmus connecting the two lateral lobes in front of the urethra. Posterior lobe it connect the two lateral lobes behind the urethra. It lies behind the median lobe and the ejaculatory ducts. Carcinomas are most common in this lobe. Median lobe lies behind the upper part of the urethra, in front of the ejaculatory ducts just below the neck of the bladder. BHP arises in this lobe. Lateral lobes lie one on each side of the urethra. Zonal or surgical division of Prostate Prostate has 3 distinct zones The peripheral zone (PZ) - accounts for 70% of volume of young adult prostate The Central zone (CZ) - accounts for 25% The transition zone (TZ) - accounts for 5% Carcinoma of prostate arises most commonly in → the peripheral zone Benign prostatic hyperplasia originates in → the transition zone