This is prostatic hyperplasia. The normal adult male prostate is about 3 to 4 cm in diameter and up to 25 gm in weight. The number of prostatic glands, as well as the stroma, has increased in this enlarged prostate seen in transverse section, and as a result, the entire prostate has increased in size. The pattern of increase here is not uniform, but nodular. This increase is in response to hormonal action on the cells, but in this case is not a normal physiologic process, but a pathologic process that could interfere with emptying of the urinary bladder.