<prompt> In BPH most common lobe involved is -LateralPosteriorMedianAnterior  <response>: Anatomical division of ProstateProstate has 5 lobes :Anterior lobeis a small isthmus connecting the two lateral lobes in front of the urethra.Posterior lobeit 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 lobelies 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 lobeslie one on each side of the urethra.Zonal or surgical division of ProstateProstate has 3 distinct zonesThe peripheral zone PZ - accounts for 70 of volume of young adult prostateThe Central zone CZ - accounts for 25The transition zone TZ - accounts for 5Carcinoma of prostate arises most commonly in the peripheral zoneBenign prostatic hyperplasia originates in the transition zone 