<prompt> Most common site of prostatic carcinoma:Anterior lobeMedian lobePosterior lobeCentral zone  <response>: Posterior lobe roughly corresponds to peripheral zone, which is the sub-capsular poion of the posterior aspect of the prostate gland that surrounds the distal urethra. 70-80 of prostatic cancers originate in this region. Median lobe- Benign Prostate Hyperophy Posterior lobe- Ca Prostate 