正常前列腺直径约3－4cm。图为前列腺结节状增生致体积增大，称为BPH（良性前列腺增生）或结节状前列腺增生。
A normal prostate gland is about 3 to 4 cm in diameter. This prostate is enlarged due to prostatic hyperplasia, which appears nodular. Thus, this condition is termed either BPH (benign prostatic hyperplasia) or nodular prostatic hyperplasia.
